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<h1>Epigenetics</h1> <p>From Wikipedia, the free encyclopedia</p> <p><a href="https://en.wikipedia.org/wiki/Epigenetics is the study of heritable changes in gene function that do not involve changes in the DNA sequence#mw-head">Jump to navigation</a><a href="https://en.wikipedia. org/wiki/Epigenetics often refers #p-search">Jump to changes in search</a></p> <p>For other uses, see chromosome&<a href="https://en.wikipedia.org/wiki/Epigenetic_(disambiguation)" title="Epigenetic (disambiguation)">Epigenetic (disambiguation)</a>.</p> <p><a href="https://en.wikipedia.org/wiki/File:Epigenetic_mechanisms.jpg"><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Epigenetic_mechanisms.jpg/449px-Epigenetic_mechanisms.jpg" style="height:269px; width:449px" /></a></p> <p>Epigenetic mechanisms</p> <p><strong>Epigenetics</strong> that affect gene activity andis the study of heritable expression, but can also be used to describe any heritable phenotypic change that does not derive from <a href="https://en.wikipedia.org/wiki/Phenotype" title="Phenotype">phenotype</a modification of the> genome, such aschanges that do not involve alterations in the prions<a href="https://en.wikipedia.org/wiki/DNA_sequence" title="DNA sequence">DNA sequence</a>.<sup><a href="https://en.wikipedia. Such effects onorg/wiki/Epigenetics#cite_note-Epigenetics_2009_review-1">[1]</a></sup> cellularThe and<a href="https://en.wikipedia.org/wiki/Ancient_Greek" title="Ancient Greek">Greek</a>prefix physiological<em><a href="https://en.wiktionary.org/wiki/epi-" title="wikt:epi-">epi-</a></em> phenotypic traits(<a href="https://en.wiktionary.org/wiki/%E1%BC%90%CF%80%CE%B9-#Ancient_Greek" title="wikt:ἐπι-">ἐπ iota;may result from external or-</a> environmental quot;factorsover, or be part outside of normal developmental program., around") in <em>epigenetics</em> implies features that are "on top of" or "in addition to" the traditional <a href="https://en.wikipedia.org/wiki/Gene" title="Gene">genetic</a> basis for inheritance.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-2">[2]</a></sup> Epigenetics most often denotes changes that affect gene activity and <a href="https://en.wikipedia.org/wiki/Gene_expression" title="Gene expression">expression</a>, but can also be used to describe any heritable phenotypic change. Such effects on <a href="https://en.wikipedia.org/wiki/Cell_(biology)" title="Cell (biology)">cellular</a> and <a href="https://en.wikipedia.org/wiki/Physiology" title="Physiology">physiological</a> <a href="https://en.wikipedia.org/wiki/Phenotypic_trait" title="Phenotypic trait">phenotypic traits</a> may result from external or <a href="https://en.wikipedia.org/wiki/Environment_(biophysical)" title="Environment (biophysical)">environmental</a> factors, or be part of normal developmental program. The standard definition of epigenetics requires these alterations to be heritable,<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-nature2008-3">[3]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19339683-4">[4]</a></sup> either in the progeny of cells or of organisms.</p> <p>The term also refers to the changes themselves: functionally relevant changes to the genome that do not involve a change in the <a href="https://en.wikipedia.org/wiki/Nucleotide_sequence" title="Nucleotide sequence">nucleotide sequence</a>. Examples of mechanisms that produce such changes are <a href="https://en.wikipedia.org/wiki/DNA_methylation" title="DNA methylation">DNA methylation</a> and <a href="https://en.wikipedia.org/wiki/Histone_modification" title="Histone modification">histone modification</a>, each of which alters how genes are expressed without altering the underlying <a href="https://en.wikipedia.org/wiki/DNA" title="DNA">DNA</a> sequence. Gene expression can be controlled through the action of <a href="https://en.wikipedia.org/wiki/Repressor_protein" title="Repressor protein">repressor proteins</a> that attach to <a href="https://en.wikipedia.org/wiki/Silencer_(DNA)" title="Silencer (DNA)">silencer</a> regions of the DNA. These epigenetic changes may last through <a href="https://en.wikipedia.org/wiki/Cell_division" title="Cell division">cell divisions</a> for the duration of the cell's life, and may also last for multiple generations even though they do not involve changes in the underlying DNA sequence of the organism;<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17522671-5">[5]</a></sup> instead, non-genetic factors cause the organism's genes to behave (or "express themselves") differently.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-6">[6]</a></sup></p> <p>One example of an epigenetic change in <a href="https://en.wikipedia.org/wiki/Eukaryotic" title="Eukaryotic">eukaryotic</a> biology is the process of <a href="https://en.wikipedia.org/wiki/Cellular_differentiation" title="Cellular differentiation">cellular differentiation</a>. During <a href="https://en.wikipedia.org/wiki/Morphogenesis" title="Morphogenesis">morphogenesis</a>, <a href="https://en.wikipedia.org/wiki/Totipotent" title="Totipotent">totipotent</a> <a href="https://en.wikipedia.org/wiki/Stem_cells" title="Stem cells">stem cells</a> become the various <a href="https://en.wikipedia.org/wiki/Pluripotent" title="Pluripotent">pluripotent</a> <a href="https://en.wikipedia.org/wiki/Cell_line" title="Cell line">cell lines</a> of the <a href="https://en.wikipedia.org/wiki/Embryo" title="Embryo">embryo</a>, which in turn become fully differentiated cells. In other words, as a single fertilized egg cell – the <a href="https://en.wikipedia.org/wiki/Zygote" title="Zygote">zygote</a> – continues to <a href="https://en.wikipedia.org/wiki/Mitosis" title="Mitosis">divide</a>, the resulting daughter cells change into all the different cell types in an organism, including <a href="https://en.wikipedia.org/wiki/Neurons" title="Neurons">neurons</a>, <a href="https://en.wikipedia.org/wiki/Muscle_cells" title="Muscle cells">muscle cells</a>, <a href="https://en.wikipedia.org/wiki/Epithelium" title="Epithelium">epithelium</a>, <a href="https://en.wikipedia.org/wiki/Endothelium" title="Endothelium">endothelium</a> of <a href="https://en.wikipedia.org/wiki/Blood_vessels" title="Blood vessels">blood vessels</a>, etc., by activating some genes while inhibiting the expression of others.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17522676-7">[7]</a></sup></p> <p>Historically, some phenomena not necessarily heritable have also been described as epigenetic. For example, the term epigenetic has been used to describe any modification of chromosomal regions, especially histone modifications, whether or not these changes are heritable or associated with a phenotype. The consensus definition now requires a trait to be heritable for it to be considered epigenetic.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19339683-4">[4]</a></sup></p> <p><input type="checkbox" /></p> <h2>Contents</h2> <ul> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Definitions">1Definitions</a> <ul> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Historical">1.1Historical</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Waddington's_canalisation,_1940s">1.2Waddington's canalisation, 1940s</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Developmental_psychology">1.3Developmental psychology</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Contemporary">1.4Contemporary</a></li> </ul> </li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Molecular_basis">2Molecular basis</a> <ul> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#DNA_damage">2.1DNA damage</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Techniques_used_to_study_epigenetics">2.2Techniques used to study epigenetics</a></li> </ul> </li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Mechanisms">3Mechanisms</a> <ul> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Covalent_modifications">3.1Covalent modifications</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#RNA_transcripts">3.2RNA transcripts</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#MicroRNAs">3.3MicroRNAs</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#mRNA">3.4mRNA</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#sRNAs">3.5sRNAs</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Prions">3.6Prions</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Structural_inheritance">3.7Structural inheritance</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Nucleosome_positioning">3.8Nucleosome positioning</a></li> </ul> </li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Functions_and_consequences">4Functions and consequences</a> <ul> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Development">4.1Development</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Transgenerational">4.2Transgenerational</a></li> </ul> </li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Epigenetics_in_bacteria">5Epigenetics in bacteria</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Medicine">6Medicine</a> <ul> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Twins">6.1Twins</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Genomic_imprinting">6.2Genomic imprinting</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Cancer">6.3Cancer</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Diabetic_wound_healing">6.4Diabetic wound healing</a></li> </ul> </li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Psychology_and_psychiatry">7Psychology and psychiatry</a> <ul> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Early_life_stress">7.1Early life stress</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Addiction">7.2Addiction</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Anxiety">7.3Anxiety</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Depression">7.4Depression</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Fear_conditioning">7.5Fear conditioning</a></li> </ul> </li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Research">8Research</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#Pseudoscience">9Pseudoscience</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#See_also">10See also</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#References">11References</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics#External_links">12External links</a></li></ul> <h2>Definitions[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=1" title="Edit section: Definitions">edit</a>]</h2> <p>The term <em>epigenetics</em> in its contemporary usage emerged in the 1990s, but for some years has been used in somewhat variable meanings.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Moore_2015-8">[8]</a></sup> A consensus definition of the concept of <em>epigenetic trait</em> as "stably heritable phenotype resulting from changes in a chromosome without alterations in the DNA sequence" was formulated at a <a href="https://en.wikipedia.org/wiki/Cold_Spring_Harbor_Laboratory" title="Cold Spring Harbor Laboratory">Cold Spring Harbor</a> meeting in 2008,<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19339683-4">[4]</a></sup> although alternate definitions that include non-heritable traits are still being used.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-NIH-9">[9]</a></sup></p> <h3>Historical[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=2" title="Edit section: Historical">edit</a>]</h3> <p>The term <em>epigenesis</em> has a generic meaning "extra growth". It has been used in English since the 17th century.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-10">[10]</a></sup></p> <h3>Waddington's canalisation, 1940s[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=3" title="Edit section: Waddington's canalisation, 1940s">edit</a>]</h3> <p>From the generic meaning, and the associated adjective <em>epigenetic</em>, <a href="https://en.wikipedia.org/wiki/C._H._Waddington" title="C. H. Waddington">C. H. Waddington</a> coined the term <em>epigenetics</em> in 1942 as pertaining to <em><a href="https://en.wikipedia.org/wiki/Epigenesis_(biology)" title="Epigenesis (biology)">epigenesis</a></em>, in parallel to <a href="https://en.wikipedia.org/wiki/Valentin_Haecker" title="Valentin Haecker">Valentin Haecker</a>'s 'phenogenetics' (<em>Phänogenetik</em>).<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-waddington-11">[11]</a></sup> <em>Epigenesis</em> in the context of the biology of that period referred to the differentiation of cells from their initial <a href="https://en.wikipedia.org/wiki/Totipotent" title="Totipotent">totipotent</a> state in embryonic development.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-12">[12]</a></sup></p> <p>When Waddington coined the term, the physical nature of genes and their role in heredity was not known; he used it as a conceptual model of how genes might interact with their surroundings to produce a phenotype; he used the phrase "epigenetic landscape" as a metaphor for <a href="https://en.wikipedia.org/wiki/Morphogenesis" title="Morphogenesis">biological development</a>. Waddington held that cell fates were <a href="https://en.wikipedia.org/wiki/Canalisation_(genetics)" title="Canalisation (genetics)">established in development (canalisation)</a> much as a marble rolls down to the point of <a href="https://en.wikipedia.org/wiki/Local_optimum" title="Local optimum">lowest local elevation</a>.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Waddington2014-13">[13]</a></sup></p> <p>Waddington suggested visualising increasing irreversibility of cell type differentiation as ridges rising between the valleys where the marbles (cells) are travelling.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-14">[14]</a></sup> In recent times Waddington's notion of the epigenetic landscape has been rigorously formalized in the context of the <a href="https://en.wikipedia.org/wiki/System_dynamics" title="System dynamics">systems dynamics</a> state approach to the study of cell-fate.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-15">[15]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-sciencedirect.com-16">[16]</a></sup> Cell-fate determination is predicted to exhibit certain dynamics, such as attractor-convergence (the attractor can be an equilibrium point, limit cycle or <a href="https://en.wikipedia.org/wiki/Strange_attractor" title="Strange attractor">strange attractor</a>) or oscillatory.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-sciencedirect.com-16">[16]</a></sup></p> <h3>Developmental psychology[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=4" title="Edit section: Developmental psychology">edit</a>]</h3> <p>The term "epigenetic" has also been used in <a href="https://en.wikipedia.org/wiki/Developmental_psychology" title="Developmental psychology">developmental psychology</a> to describe psychological development as the result of an ongoing, bi-directional interchange between heredity and the environment.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-17">[17]</a></sup> Interactivist ideas of development have been discussed in various forms and under various names throughout the 19th and 20th centuries. An early version was proposed, among the founding statements in <a href="https://en.wikipedia.org/wiki/Embryology" title="Embryology">embryology</a>, by <a href="https://en.wikipedia.org/wiki/Karl_Ernst_von_Baer" title="Karl Ernst von Baer">Karl Ernst von Baer</a> and popularized by <a href="https://en.wikipedia.org/wiki/Ernst_Haeckel" title="Ernst Haeckel">Ernst Haeckel</a>. A radical epigenetic view (physiological epigenesis) was developed by <a href="https://en.wikipedia.org/wiki/Paul_Wintrebert" title="Paul Wintrebert">Paul Wintrebert</a>. Another variation, probabilistic epigenesis, was presented by <a href="https://en.wikipedia.org/wiki/Gilbert_Gottlieb" title="Gilbert Gottlieb">Gilbert Gottlieb</a> in 2003.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-18">[18]</a></sup> This view encompasses all of the possible developing factors on an organism and how they not only influence the organism and each other, but how the organism also influences its own development.</p> <p>The developmental psychologist <a href="https://en.wikipedia.org/wiki/Erik_Erikson" title="Erik Erikson">Erik Erikson</a> wrote of an <em>epigenetic principle</em> in his book <a href="https://en.wikipedia.org/wiki/Erik_Erikson#Bibliography" title="Erik Erikson"><em>Identity: Youth and Crisis</em> (1968)</a>, encompassing the notion that we develop through an unfolding of our personality in predetermined stages, and that our environment and surrounding culture influence how we progress through these stages. This biological unfolding in relation to our socio-cultural settings is done in <a href="https://en.wikipedia.org/wiki/Erikson%27s_stages_of_psychosocial_development" title="Erikson's stages of psychosocial development">stages of psychosocial development</a>, where "progress through each stage is in part determined by our success, or lack of success, in all the previous stages."<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Boeree1997-19">[19]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-20">[20]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-21">[21]</a></sup></p> <h3>Contemporary[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=5" title="Edit section: Contemporary">edit</a>]</h3> <p><a href="https://en.wikipedia.org/wiki/Robin_Holliday" title="Robin Holliday">Robin Holliday</a> defined epigenetics as "the study of the mechanisms of temporal and spatial control of gene activity during the development of complex organisms."<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid2265224-22">[22]</a></sup> Thus <em>epigenetic</em> can be used to describe anything other than DNA sequence that influences the development of an organism.</p> <p>The more recent usage of the word in science has a stricter definition. It is, as defined by <a href="https://en.wikipedia.org/wiki/Arthur_Riggs_(geneticist)" title="Arthur Riggs (geneticist)">Arthur Riggs</a> and colleagues, "the study of <a href="https://en.wikipedia.org/wiki/Mitosis" title="Mitosis">mitotically</a> and/or <a href="https://en.wikipedia.org/wiki/Meiosis" title="Meiosis">meiotically</a> heritable changes in gene function that cannot be explained by changes in DNA sequence."<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-isbn0-87969-490-4-23">[23]</a></sup></p> <p>The term "epigenetics", however, has been used to describe processes which have not been demonstrated to be heritable such as some forms of histone modification; there are therefore attempts to redefine it in broader terms that would avoid the constraints of requiring heritability. For example, <a href="https://en.wikipedia.org/wiki/Adrian_Peter_Bird" title="Adrian Peter Bird">Adrian Bird</a> defined epigenetics as "the structural adaptation of chromosomal regions so as to register, signal or perpetuate altered activity states."<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17522671-5">[5]</a></sup> This definition would be inclusive of transient modifications associated with <a href="https://en.wikipedia.org/wiki/DNA_repair" title="DNA repair">DNA repair</a> or <a href="https://en.wikipedia.org/wiki/Cell-cycle" title="Cell-cycle">cell-cycle</a> phases as well as stable changes maintained across multiple cell generations, but exclude others such as templating of membrane architecture and <a href="https://en.wikipedia.org/wiki/Prions" title="Prions">prions</a> unless they impinge on chromosome function. Such redefinitions however are not universally accepted and are still subject to dispute.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-nature2008-3">[3]</a></sup> The <a href="https://en.wikipedia.org/wiki/National_Institutes_of_Health" title="National Institutes of Health">NIH</a> "Roadmap Epigenomics Project", ongoing as of 2016, uses the following definition: "For purposes of this program, epigenetics refers to both heritable changes in gene activity and expression (in the progeny of cells or of individuals) and also stable, long-term alterations in the transcriptional potential of a cell that are not necessarily heritable."<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-NIH-9">[9]</a></sup></p> <p>In 2008, a consensus definition of the epigenetic trait, "stably heritable phenotype resulting from changes in a chromosome without alterations in the DNA sequence", was made at a <a href="https://en.wikipedia.org/wiki/Cold_Spring_Harbor_Laboratory" title="Cold Spring Harbor Laboratory">Cold Spring Harbor</a> meeting.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19339683-4">[4]</a></sup></p> <p>The similarity of the word to "genetics" has generated many parallel usages. The "epigenome" is a parallel to the word "genome", referring to the overall epigenetic state of a cell, and <a href="https://en.wikipedia.org/wiki/Epigenomics" title="Epigenomics">epigenomics</a>refers to more global analyses of epigenetic changes across the entire genome.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-NIH-9">[9]</a></sup> The phrase "<a href="https://en.wikipedia.org/wiki/Genetic_code" title="Genetic code">genetic code</a>" has also been adapted – the "<a href="https://en.wikipedia.org/wiki/Epigenetic_code" title="Epigenetic code">epigenetic code</a>" has been used to describe the set of epigenetic features that create different phenotypes in different cells. Taken to its extreme, the "epigenetic code" could represent the total state of the cell, with the position of each molecule accounted for in an <em>epigenomic map</em>, a diagrammatic representation of the gene expression, DNA methylation and histone modification status of a particular genomic region. More typically, the term is used in reference to systematic efforts to measure specific, relevant forms of epigenetic information such as the <a href="https://en.wikipedia.org/wiki/Histone_code_hypothesis" title="Histone code hypothesis">histone code</a> or <a href="https://en.wikipedia.org/wiki/DNA_methylation" title="DNA methylation">DNA methylation</a> patterns.</p> <h2>Molecular basis[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=6" title="Edit section: Molecular basis">edit</a>]</h2> <p>Epigenetic changes modify the activation of certain genes, but not the genetic code sequence of DNA. The microstructure (not code) of DNA itself or the associated <a href="https://en.wikipedia.org/wiki/Chromatin" title="Chromatin">chromatin</a> proteins may be modified, causing activation or silencing. This mechanism enables differentiated cells in a multicellular organism to express only the genes that are necessary for their own activity. Epigenetic changes are preserved when cells divide. Most epigenetic changes only occur within the course of one individual organism's lifetime; however, these epigenetic changes can be transmitted to the organism's offspring through a process called <a href="https://en.wikipedia.org/wiki/Transgenerational_epigenetic_inheritance" title="Transgenerational epigenetic inheritance">transgenerational epigenetic inheritance</a>. Moreover, if gene inactivation occurs in a sperm or egg cell that results in fertilization, this epigenetic modification may also be transferred to the next generation.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17320501-24">[24]</a></sup></p> <p>Specific epigenetic processes include <a href="https://en.wikipedia.org/wiki/Paramutation" title="Paramutation">paramutation</a>, <a href="https://en.wikipedia.org/wiki/Bookmarking" title="Bookmarking">bookmarking</a>, <a href="https://en.wikipedia.org/wiki/Imprinting_(genetics)" title="Imprinting (genetics)">imprinting</a>, <a href="https://en.wikipedia.org/wiki/Gene_silencing" title="Gene silencing">gene silencing</a>, <a href="https://en.wikipedia.org/wiki/X-inactivation" title="X-inactivation">X chromosome inactivation</a>, <a href="https://en.wikipedia.org/wiki/Position_effect" title="Position effect">position effect</a>, <a href="https://en.wikipedia.org/wiki/DNA_methylation_reprogramming" title="DNA methylation reprogramming">DNA methylation reprogramming</a>, <a href="https://en.wikipedia.org/wiki/Transvection_(genetics)" title="Transvection (genetics)">transvection</a>, <a href="https://en.wikipedia.org/wiki/Maternal_effect" title="Maternal effect">maternal effects</a>, the progress of <a href="https://en.wikipedia.org/wiki/Carcinogenesis" title="Carcinogenesis">carcinogenesis</a>, many effects of <a href="https://en.wikipedia.org/wiki/Teratogen" title="Teratogen">teratogens</a>, regulation of <a href="https://en.wikipedia.org/wiki/Histone" title="Histone">histone</a> modifications and <a href="https://en.wikipedia.org/wiki/Heterochromatin" title="Heterochromatin">heterochromatin</a>, and technical limitations affecting <a href="https://en.wikipedia.org/wiki/Parthenogenesis" title="Parthenogenesis">parthenogenesis</a> and <a href="https://en.wikipedia.org/wiki/Cloning" title="Cloning">cloning</a>.</p> <h3>DNA damage[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=7" title="Edit section: DNA damage">edit</a>]</h3> <p>DNA damage can also cause epigenetic changes.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-25">[25]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-26">[26]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-27">[27]</a></sup> DNA damage is very frequent, occurring on average about 60,000 times a day per cell of the human body (see <a href="https://en.wikipedia.org/wiki/DNA_damage_(naturally_occurring)" title="DNA damage (naturally occurring)">DNA damage (naturally occurring)</a>). These damages are largely repaired, but at the site of a DNA repair, epigenetic changes can remain.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-28">[28]</a></sup> In particular, a double strand break in DNA can initiate unprogrammed epigenetic gene silencing both by causing DNA methylation as well as by promoting silencing types of histone modifications (chromatin remodeling - see next section).<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-29">[29]</a></sup> In addition, the enzyme <a href="https://en.wikipedia.org/wiki/Poly_ADP_ribose_polymerase" title="Poly ADP ribose polymerase">Parp1 (poly(ADP)-ribose polymerase)</a> and its product poly(ADP)-ribose (PAR) accumulate at sites of DNA damage as part of a repair process.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-30">[30]</a></sup> This accumulation, in turn, directs recruitment and activation of the chromatin remodeling protein ALC1 that can cause <a href="https://en.wikipedia.org/wiki/Nucleosome" title="Nucleosome">nucleosome</a> remodeling.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-31">[31]</a></sup> Nucleosome remodeling has been found to cause, for instance, epigenetic silencing of DNA repair gene MLH1.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-isbn0-87969-490-4-23">[23]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-32">[32]</a></sup>DNA damaging chemicals, such as <a href="https://en.wikipedia.org/wiki/Benzene" title="Benzene">benzene</a>, <a href="https://en.wikipedia.org/wiki/Hydroquinone" title="Hydroquinone">hydroquinone</a>, <a href="https://en.wikipedia.org/wiki/Styrene" title="Styrene">styrene</a>, <a href="https://en.wikipedia.org/wiki/Carbon_tetrachloride" title="Carbon tetrachloride">carbon tetrachloride</a> and <a href="https://en.wikipedia.org/wiki/Trichloroethylene" title="Trichloroethylene">trichloroethylene</a>, cause considerable hypomethylation of DNA, some through the activation of oxidative stress pathways.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-33">[33]</a></sup></p> <p>Foods are known to alter the epigenetics of rats on different diets.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-34">[34]</a></sup> Some food components epigenetically increase the levels of DNA repair enzymes such as <a href="https://en.wikipedia.org/wiki/O-6-methylguanine-DNA_methyltransferase" title="O-6-methylguanine-DNA methyltransferase">MGMT</a> and <a href="https://en.wikipedia.org/wiki/MLH1" title="MLH1">MLH1</a><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-35">[35]</a></sup> and <a href="https://en.wikipedia.org/wiki/P53" title="P53">p53</a>.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-36">[36]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-37">[37]</a></sup>Other food components can reduce DNA damage, such as soy <a href="https://en.wikipedia.org/wiki/Isoflavones" title="Isoflavones">isoflavones</a>. In one study, markers for oxidative stress, such as modified nucleotides that can result from DNA damage, were decreased by a 3-week diet supplemented with soy.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-38">[38]</a></sup> A decrease in oxidative DNA damage was also observed 2 h after consumption of <a href="https://en.wikipedia.org/wiki/Anthocyanin" title="Anthocyanin">anthocyanin</a>-rich <a href="https://en.wikipedia.org/wiki/Bilberry" title="Bilberry">bilberry</a> (<em><a href="https://en.wikipedia.org/wiki/Vaccinium_myrtillus" title="Vaccinium myrtillus">Vaccinium myrtillius</a></em> L.) <a href="https://en.wikipedia.org/wiki/Pomace" title="Pomace">pomace</a> extract.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-39">[39]</a></sup></p> <h3>Techniques used to study epigenetics[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=8" title="Edit section: Techniques used to study epigenetics">edit</a>]</h3> <p>Epigenetic research uses a wide range of <a href="https://en.wikipedia.org/wiki/Molecular_biology" title="Molecular biology">molecular biological</a> techniques to further understanding of epigenetic phenomena, including <a href="https://en.wikipedia.org/wiki/Chromatin_immunoprecipitation" title="Chromatin immunoprecipitation">chromatin immunoprecipitation</a> (together with its large-scale variants <a href="https://en.wikipedia.org/wiki/ChIP-on-chip" title="ChIP-on-chip">ChIP-on-chip</a> and <a href="https://en.wikipedia.org/wiki/ChIP-Seq" title="ChIP-Seq">ChIP-Seq</a>), <a href="https://en.wikipedia.org/wiki/Fluorescent_in_situ_hybridization" title="Fluorescent in situ hybridization">fluorescent in situ hybridization</a>, methylation-sensitive <a href="https://en.wikipedia.org/wiki/Restriction_enzymes" title="Restriction enzymes">restriction enzymes</a>, DNA adenine methyltransferase identification (<a href="https://en.wikipedia.org/wiki/DamID" title="DamID">DamID</a>) and <a href="https://en.wikipedia.org/wiki/Bisulfite_sequencing" title="Bisulfite sequencing">bisulfite sequencing</a>.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-verma-40">[40]</a></sup>Furthermore, the use of <a href="https://en.wikipedia.org/wiki/Bioinformatics" title="Bioinformatics">bioinformatics</a> methods has a role in (<a href="https://en.wikipedia.org/wiki/Computational_epigenetics" title="Computational epigenetics">computational epigenetics</a>).<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-verma-40">[40]</a></sup></p> <h2>Mechanisms[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=9" title="Edit section: Mechanisms">edit</a>]</h2> <p>Several types of epigenetic inheritance systems may play a role in what has become known as cell memory,<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-jablonka92-41">[41]</a></sup> note however that not all of these are universally accepted to be examples of epigenetics.</p> <h3>Covalent modifications[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=10" title="Edit section: Covalent modifications">edit</a>]</h3> <p><a href="https://en.wikipedia.org/wiki/Covalent" title="Covalent">Covalent</a> modifications of either DNA (e.g. cytosine methylation and hydroxymethylation) or of histone proteins (e.g. lysine acetylation, lysine and arginine methylation, serine and threonine phosphorylation, and lysine ubiquitination and sumoylation) play central roles in many types of epigenetic inheritance. Therefore, the word "epigenetics" is sometimes used as a synonym for these processes. However, this can be misleading. Chromatin remodeling is not always inherited, and not all epigenetic inheritance involves chromatin remodeling.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17407749-42">[42]</a></sup></p> <p><a href="https://en.wikipedia.org/wiki/File:Nucleosome_1KX5_2.png"><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/db/Nucleosome_1KX5_2.png/220px-Nucleosome_1KX5_2.png" style="height:220px; width:220px" /></a></p> <p>DNA associates with histone proteins to form chromatin.</p> <p>Because the <a href="https://en.wikipedia.org/wiki/Phenotype" title="Phenotype">phenotype</a> of a cell or individual is affected by which of its genes are transcribed, heritable <a href="https://en.wikipedia.org/wiki/Transcription_(genetics)" title="Transcription (genetics)">transcription states</a> can give rise to epigenetic effects. There are several layers of regulation of <a href="https://en.wikipedia.org/wiki/Gene_expression" title="Gene expression">gene expression</a>. One way that genes are regulated is through the remodeling of chromatin. Chromatin is the complex of DNA and the <a href="https://en.wikipedia.org/wiki/Histone" title="Histone">histone</a> proteins with which it associates. If the way that DNA is wrapped around the histones changes, gene expression can change as well. Chromatin remodeling is accomplished through two main mechanisms:</p> <ol> <li>The first way is <a href="https://en.wikipedia.org/wiki/Post_translational_modification" title="Post translational modification">post translational modification</a> of the amino acids that make up histone proteins. Histone proteins are made up of long chains of amino acids. If the amino acids that are in the chain are changed, the shape of the histone might be modified. DNA is not completely unwound during replication. It is possible, then, that the modified histones may be carried into each new copy of the DNA. Once there, these histones may act as templates, initiating the surrounding new histones to be shaped in the new manner. By altering the shape of the histones around them, these modified histones would ensure that a lineage-specific transcription program is maintained after cell division.</li> <li>The second way is the addition of methyl groups to the DNA, mostly at <a href="https://en.wikipedia.org/wiki/CpG_site" title="CpG site">CpG sites</a>, to convert <a href="https://en.wikipedia.org/wiki/Cytosine" title="Cytosine">cytosine</a> to <a href="https://en.wikipedia.org/wiki/5-methylcytosine" title="5-methylcytosine">5-methylcytosine</a>. 5-Methylcytosine performs much like a regular cytosine, pairing with a guanine in double-stranded DNA. However, some areas of the genome are methylated more heavily than others, and highly methylated areas tend to be less transcriptionally active, through a mechanism not fully understood. Methylation of cytosines can also persist from the germ line of one of the parents into the zygote, marking the chromosome as being inherited from one parent or the other (<a href="https://en.wikipedia.org/wiki/Genetic_imprinting" title="Genetic imprinting">genetic imprinting</a>).</li></ol> <p>Mechanisms of heritability of histone state are not well understood; however, much is known about the mechanism of heritability of DNA methylation state during cell division and differentiation. Heritability of methylation state depends on certain enzymes (such as <a href="https://en.wikipedia.org/wiki/DNA_methyltransferase" title="DNA methyltransferase">DNMT1</a>) that have a higher affinity for 5-methylcytosine than for cytosine. If this enzyme reaches a "hemimethylated" portion of DNA (where 5-methylcytosine is in only one of the two DNA strands) the enzyme will methylate the other half.</p> <p>Although histone modifications occur throughout the entire sequence, the unstructured N-termini of histones (called histone tails) are particularly highly modified. These modifications include <a href="https://en.wikipedia.org/wiki/Acetylation" title="Acetylation">acetylation</a>, <a href="https://en.wikipedia.org/wiki/Methylation" title="Methylation">methylation</a>, <a href="https://en.wikipedia.org/wiki/Ubiquitylation" title="Ubiquitylation">ubiquitylation</a>, <a href="https://en.wikipedia.org/wiki/Phosphorylation" title="Phosphorylation">phosphorylation</a>, <a href="https://en.wikipedia.org/wiki/Sumoylation" title="Sumoylation">sumoylation</a>, ribosylation and citrullination. Acetylation is the most highly studied of these modifications. For example, acetylation of the K14 and K9 <a href="https://en.wikipedia.org/wiki/Lysine" title="Lysine">lysines</a> of the tail of histone H3 by histone acetyltransferase enzymes (HATs) is generally related to transcriptional competence.<sup>[<em><a href="https://en.wikipedia.org/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a></em>]</sup></p> <p>One mode of thinking is that this tendency of acetylation to be associated with "active" transcription is biophysical in nature. Because it normally has a positively charged nitrogen at its end, lysine can bind the negatively charged phosphates of the DNA backbone. The acetylation event converts the positively charged amine group on the side chain into a neutral amide linkage. This removes the positive charge, thus loosening the DNA from the histone. When this occurs, complexes like <a href="https://en.wikipedia.org/wiki/SWI/SNF" title="SWI/SNF">SWI/SNF</a> and other transcriptional factors can bind to the DNA and allow transcription to occur. This is the "cis" model of epigenetic function. In other words, changes to the histone tails have a direct effect on the DNA itself.<sup>[<em><a href="https://en.wikipedia.org/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a></em>]</sup></p> <p>Another model of epigenetic function is the "trans" model. In this model, changes to the histone tails act indirectly on the DNA. For example, lysine acetylation may create a binding site for chromatin-modifying enzymes (or transcription machinery as well). This chromatin remodeler can then cause changes to the state of the chromatin. Indeed, a bromodomain – a protein domain that specifically binds acetyl-lysine – is found in many enzymes that help activate transcription, including the <a href="https://en.wikipedia.org/wiki/SWI/SNF" title="SWI/SNF">SWI/SNF</a> complex. It may be that acetylation acts in this and the previous way to aid in transcriptional activation.</p> <p>The idea that modifications act as docking modules for related factors is borne out by <a href="https://en.wikipedia.org/wiki/Histone_methylation" title="Histone methylation">histone methylation</a> as well. Methylation of lysine 9 of histone H3 has long been associated with constitutively transcriptionally silent chromatin (constitutive <a href="https://en.wikipedia.org/wiki/Heterochromatin" title="Heterochromatin">heterochromatin</a>). It has been determined that a chromodomain (a domain that specifically binds methyl-lysine) in the transcriptionally repressive protein <a href="https://en.wikipedia.org/wiki/Heterochromatin_Protein_1" title="Heterochromatin Protein 1">HP1</a> recruits HP1 to K9 methylated regions. One example that seems to refute this biophysical model for methylation is that tri-methylation of histone H3 at lysine 4 is strongly associated with (and required for full) transcriptional activation. Tri-methylation in this case would introduce a fixed positive charge on the tail.</p> <p>It has been shown that the histone lysine methyltransferase (KMT) is responsible for this methylation activity in the pattern of histones H3 & H4. This enzyme utilizes a catalytically active site called the SET domain (Suppressor of variegation, Enhancer of zeste, Trithorax). The SET domain is a 130-amino acid sequence involved in modulating gene activities. This domain has been demonstrated to bind to the histone tail and causes the methylation of the histone.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid9487389-43">[43]</a></sup></p> <p>Differing histone modifications are likely to function in differing ways; acetylation at one position is likely to function differently from acetylation at another position. Also, multiple modifications may occur at the same time, and these modifications may work together to change the behavior of the <a href="https://en.wikipedia.org/wiki/Nucleosome" title="Nucleosome">nucleosome</a>. The idea that multiple dynamic modifications regulate gene transcription in a systematic and reproducible way is called the <a href="https://en.wikipedia.org/wiki/Histone_code" title="Histone code">histone code</a>, although the idea that histone state can be read linearly as a digital information carrier has been largely debunked. One of the best-understood systems that orchestrates chromatin-based silencing is the <a href="https://en.wikipedia.org/wiki/SIR_protein" title="SIR protein">SIR protein</a> based silencing of the yeast hidden mating type loci HML and HMR.</p> <p>DNA methylation frequently occurs in repeated sequences, and helps to suppress the expression and mobility of '<a href="https://en.wikipedia.org/wiki/Transposable_elements" title="Transposable elements">transposable elements</a>':<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-slotkin2007-44">[44]</a></sup> Because <a href="https://en.wikipedia.org/wiki/5-methylcytosine" title="5-methylcytosine">5-methylcytosine</a> can be spontaneously deaminated (replacing nitrogen by oxygen) to <a href="https://en.wikipedia.org/wiki/Thymidine" title="Thymidine">thymidine</a>, CpG sites are frequently mutated and become rare in the genome, except at <a href="https://en.wikipedia.org/wiki/CpG_islands" title="CpG islands">CpG islands</a> where they remain unmethylated. Epigenetic changes of this type thus have the potential to direct increased frequencies of permanent genetic mutation. <a href="https://en.wikipedia.org/wiki/DNA_methylation" title="DNA methylation">DNA methylation</a> patterns are known to be established and modified in response to environmental factors by a complex interplay of at least three independent <a href="https://en.wikipedia.org/wiki/DNA_methyltransferase" title="DNA methyltransferase">DNA methyltransferases</a>, DNMT1, DNMT3A, and DNMT3B, the loss of any of which is lethal in mice.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-li92-45">[45]</a></sup> DNMT1 is the most abundant methyltransferase in somatic cells,<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-robertson99-46">[46]</a></sup> localizes to replication foci,<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-leonhardt92-47">[47]</a></sup> has a 10–40-fold preference for hemimethylated DNA and interacts with the <a href="https://en.wikipedia.org/wiki/Proliferating_cell_nuclear_antigen" title="Proliferating cell nuclear antigen">proliferating cell nuclear antigen</a> (PCNA).<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-chuang97-48">[48]</a></sup></p> <p>By preferentially modifying hemimethylated DNA, DNMT1 transfers patterns of methylation to a newly synthesized strand after <a href="https://en.wikipedia.org/wiki/DNA_replication" title="DNA replication">DNA replication</a>, and therefore is often referred to as the ‘maintenance' methyltransferase.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-robertson00-49">[49]</a></sup> DNMT1 is essential for proper embryonic development, imprinting and X-inactivation.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-li92-45">[45]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-li93-50">[50]</a></sup> To emphasize the difference of this molecular mechanism of inheritance from the canonical Watson-Crick base-pairing mechanism of transmission of genetic information, the term 'Epigenetic templating' was introduced.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-51">[51]</a></sup> Furthermore, in addition to the maintenance and transmission of methylated DNA states, the same principle could work in the maintenance and transmission of histone modifications and even cytoplasmic (<a href="https://en.wikipedia.org/wiki/Structural_inheritance" title="Structural inheritance">structural</a>) heritable states.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid18419815-52">[52]</a></sup></p> <p>Histones H3 and H4 can also be manipulated through demethylation using histone lysine demethylase (KDM). This recently identified enzyme has a catalytically active site called the Jumonji domain (JmjC). The demethylation occurs when JmjC utilizes multiple cofactors to hydroxylate the methyl group, thereby removing it. JmjC is capable of demethylating mono-, di-, and tri-methylated substrates.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19234061-53">[53]</a></sup></p> <p>Chromosomal regions can adopt stable and heritable alternative states resulting in bistable gene expression without changes to the DNA sequence. Epigenetic control is often associated with alternative <a href="https://en.wikipedia.org/wiki/Covalent_modification" title="Covalent modification">covalent modifications</a> of histones.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Rosenfeld_2009-54">[54]</a></sup> The stability and heritability of states of larger chromosomal regions are suggested to involve positive feedback where modified <a href="https://en.wikipedia.org/wiki/Nucleosome" title="Nucleosome">nucleosomes</a> recruit enzymes that similarly modify nearby nucleosomes.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-55">[55]</a></sup> A simplified stochastic model for this type of epigenetics is found here.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-56">[56]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17512413-57">[57]</a></sup></p> <p>It has been suggested that chromatin-based transcriptional regulation could be mediated by the effect of small RNAs. <a href="https://en.wikipedia.org/wiki/Small_interfering_RNA" title="Small interfering RNA">Small interfering RNAs</a> can modulate transcriptional gene expression via epigenetic modulation of targeted <a href="https://en.wikipedia.org/wiki/Promoter_(biology)" title="Promoter (biology)">promoters</a>.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Morris-58">[58]</a></sup></p> <h3>RNA transcripts[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=11" title="Edit section: RNA transcripts">edit</a>]</h3> <p>Sometimes a gene, after being turned on, transcribes a product that (directly or indirectly) maintains the activity of that gene. For example, <a href="https://en.wikipedia.org/wiki/Hnf4" title="Hnf4">Hnf4</a> and <a href="https://en.wikipedia.org/wiki/MyoD" title="MyoD">MyoD</a> enhance the transcription of many liver- and muscle-specific genes, respectively, including their own, through the <a href="https://en.wikipedia.org/wiki/Transcription_factor" title="Transcription factor">transcription factor</a> activity of the <a href="https://en.wikipedia.org/wiki/Proteins" title="Proteins">proteins</a> they encode. RNA signalling includes differential recruitment of a hierarchy of generic chromatin modifying complexes and DNA methyltransferases to specific loci by RNAs during differentiation and development.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19154003-59">[59]</a></sup> Other epigenetic changes are mediated by the production of <a href="https://en.wikipedia.org/wiki/Alternative_splicing" title="Alternative splicing">different splice forms</a> of <a href="https://en.wikipedia.org/wiki/RNA" title="RNA">RNA</a>, or by formation of double-stranded RNA (<a href="https://en.wikipedia.org/wiki/RNAi" title="RNAi">RNAi</a>). Descendants of the cell in which the gene was turned on will inherit this activity, even if the original stimulus for gene-activation is no longer present. These genes are often turned on or off by <a href="https://en.wikipedia.org/wiki/Signal_transduction" title="Signal transduction">signal transduction</a>, although in some systems where <a href="https://en.wikipedia.org/wiki/Syncytia" title="Syncytia">syncytia</a> or <a href="https://en.wikipedia.org/wiki/Gap_junction" title="Gap junction">gap junctions</a> are important, RNA may spread directly to other cells or nuclei by <a href="https://en.wikipedia.org/wiki/Diffusion" title="Diffusion">diffusion</a>. A large amount of RNA and protein is contributed to the <a href="https://en.wikipedia.org/wiki/Zygote" title="Zygote">zygote</a> by the mother during <a href="https://en.wikipedia.org/wiki/Oogenesis" title="Oogenesis">oogenesis</a> or via <a href="https://en.wikipedia.org/wiki/Nurse_cell" title="Nurse cell">nurse cells</a>, resulting in <a href="https://en.wikipedia.org/wiki/Maternal_effect" title="Maternal effect">maternal effect</a> phenotypes. A smaller quantity of sperm RNA is transmitted from the father, but there is recent evidence that this epigenetic information can lead to visible changes in several generations of offspring.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-choi06-60">[60]</a></sup></p> <h3>MicroRNAs[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=12" title="Edit section: MicroRNAs">edit</a>]</h3> <p><a href="https://en.wikipedia.org/wiki/MicroRNA" title="MicroRNA">MicroRNAs</a> (miRNAs) are members of <a href="https://en.wikipedia.org/wiki/Non-coding_RNA" title="Non-coding RNA">non-coding RNAs</a> that range in size from 17 to 25 nucleotides. miRNAs regulate a large variety of biological functions in plants and animals.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Wang-61">[61]</a></sup> So far, in 2013, about 2000 miRNAs have been discovered in humans and these can be found online in a miRNA database.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-62">[62]</a></sup> Each miRNA expressed in a cell may target about 100 to 200 messenger RNAs that it downregulates.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-63">[63]</a></sup> Most of the downregulation of mRNAs occurs by causing the decay of the targeted mRNA, while some downregulation occurs at the level of translation into protein.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-64">[64]</a></sup></p> <p>It appears that about 60% of human protein coding genes are regulated by miRNAs.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-65">[65]</a></sup> Many miRNAs are epigenetically regulated. About 50% of miRNA genes are associated with <a href="https://en.wikipedia.org/wiki/CpG_island" title="CpG island">CpG islands</a>,<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Wang-61">[61]</a></sup> that may be repressed by epigenetic methylation. Transcription from methylated CpG islands is strongly and heritably repressed.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-66">[66]</a></sup> Other miRNAs are epigenetically regulated by either histone modifications or by combined DNA methylation and histone modification.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Wang-61">[61]</a></sup></p> <h3>mRNA[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=13" title="Edit section: mRNA">edit</a>]</h3> <p>In 2011, it was demonstrated that the <a href="https://en.wikipedia.org/wiki/Methylation" title="Methylation">methylation</a> of <a href="https://en.wikipedia.org/wiki/Messenger_RNA" title="Messenger RNA">mRNA</a> plays a critical role in human <a href="https://en.wikipedia.org/wiki/Energy_balance_(biology)" title="Energy balance (biology)">energy homeostasis</a>. The obesity-associated <a href="https://en.wikipedia.org/wiki/FTO_gene" title="FTO gene">FTO gene</a> is shown to be able to <a href="https://en.wikipedia.org/wiki/Demethylate" title="Demethylate">demethylate</a> <a href="https://en.wikipedia.org/wiki/N6-methyladenosine" title="N6-methyladenosine">N6-methyladenosine</a> in RNA.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-67">[67]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-68">[68]</a></sup></p> <h3>sRNAs[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=14" title="Edit section: sRNAs">edit</a>]</h3> <p><a href="https://en.wikipedia.org/wiki/Bacterial_small_RNA" title="Bacterial small RNA">sRNAs</a> are small (50–250 nucleotides), highly structured, non-coding RNA fragments found in bacteria. They control gene expression including <a href="https://en.wikipedia.org/wiki/Virulence" title="Virulence">virulence</a> genes in pathogens and are viewed as new targets in the fight against drug-resistant bacteria.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-69">[69]</a></sup> They play an important role in many biological processes, binding to mRNA and protein targets in prokaryotes. Their phylogenetic analyses, for example through sRNA–mRNA target interactions or protein <a href="https://en.wikipedia.org/wiki/Hfq_binding_sRNA" title="Hfq binding sRNA">binding properties</a>, are used to build comprehensive databases.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-70">[70]</a></sup> sRNA-<a href="https://en.wikipedia.org/wiki/Gene_map" title="Gene map">gene maps</a> based on their targets in microbial genomes are also constructed.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-71">[71]</a></sup></p> <h3>Prions[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=15" title="Edit section: Prions">edit</a>]</h3> <p>Further information: <a href="https://en.wikipedia.org/wiki/Fungal_prions" title="Fungal prions">Fungal prions</a></p> <p><a href="https://en.wikipedia.org/wiki/Prion" title="Prion">Prions</a> are <a href="https://en.wikipedia.org/wiki/Infection" title="Infection">infectious</a> forms of <a href="https://en.wikipedia.org/wiki/Protein" title="Protein">proteins</a>. In general, proteins fold into discrete units that perform distinct cellular functions, but some proteins are also capable of forming an infectious conformational state known as a prion. Although often viewed in the context of <a href="https://en.wikipedia.org/wiki/Transmissible_spongiform_encephalopathy" title="Transmissible spongiform encephalopathy">infectious disease</a>, prions are more loosely defined by their ability to catalytically convert other native state versions of the same protein to an infectious conformational state. It is in this latter sense that they can be viewed as epigenetic agents capable of inducing a phenotypic change without a modification of the genome.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-72">[72]</a></sup></p> <p><a href="https://en.wikipedia.org/wiki/Fungal_prion" title="Fungal prion">Fungal prions</a> are considered by some to be epigenetic because the infectious phenotype caused by the prion can be inherited without modification of the genome. <a href="https://en.wikipedia.org/wiki/PSI_(prion)" title="PSI (prion)">PSI+</a> and URE3, discovered in <a href="https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae" title="Saccharomyces cerevisiae">yeast</a>in 1965 and 1971, are the two best studied of this type of prion.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-73">[73]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid5573734-74">[74]</a></sup> Prions can have a phenotypic effect through the sequestration of protein in aggregates, thereby reducing that protein's activity. In PSI+ cells, the loss of the Sup35 protein (which is involved in termination of translation) causes ribosomes to have a higher rate of read-through of stop <a href="https://en.wikipedia.org/wiki/Codon" title="Codon">codons</a>, an effect that results in suppression of <a href="https://en.wikipedia.org/wiki/Nonsense_mutation" title="Nonsense mutation">nonsense mutations</a> in other genes.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid225301-75">[75]</a></sup> The ability of Sup35 to form prions may be a conserved trait. It could confer an adaptive advantage by giving cells the ability to <a href="https://en.wikipedia.org/wiki/Evolutionary_capacitance" title="Evolutionary capacitance">switch into a PSI+ state</a> and express dormant genetic features normally terminated by stop codon mutations.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid11028992-76">[76]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid15931169-77">[77]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-78">[78]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-79">[79]</a></sup></p> <h3>Structural inheritance[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=16" title="Edit section: Structural inheritance">edit</a>]</h3> <p>Further information: <a href="https://en.wikipedia.org/wiki/Structural_inheritance" title="Structural inheritance">Structural inheritance</a></p> <p>In <a href="https://en.wikipedia.org/wiki/Ciliate" title="Ciliate">ciliates</a> such as <em><a href="https://en.wikipedia.org/wiki/Tetrahymena" title="Tetrahymena">Tetrahymena</a></em> and <em><a href="https://en.wikipedia.org/wiki/Paramecium" title="Paramecium">Paramecium</a></em>, genetically identical cells show heritable differences in the patterns of ciliary rows on their cell surface. Experimentally altered patterns can be transmitted to daughter cells. It seems existing structures act as templates for new structures. The mechanisms of such inheritance are unclear, but reasons exist to assume that multicellular organisms also use existing cell structures to assemble new ones.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid1804215-80">[80]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-isbn0-19-515619-6-81">[81]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-isbn0-262-65063-0-82">[82]</a></sup></p> <h3>Nucleosome positioning[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=17" title="Edit section: Nucleosome positioning">edit</a>]</h3> <p>Eukaryotic genomes have numerous <a href="https://en.wikipedia.org/wiki/Nucleosomes" title="Nucleosomes">nucleosomes</a>. Nucleosome position is not random, and determine the accessibility of DNA to regulatory proteins. This determines differences in gene expression and cell differentiation. It has been shown that at least some nucleosomes are retained in sperm cells (where most but not all histones are replaced by <a href="https://en.wikipedia.org/wiki/Protamines" title="Protamines">protamines</a>). Thus nucleosome positioning is to some degree inheritable. Recent studies have uncovered connections between nucleosome positioning and other epigenetic factors, such as DNA methylation and hydroxymethylation.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Teif_2014-83">[83]</a></sup></p> <h2>Functions and consequences[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=18" title="Edit section: Functions and consequences">edit</a>]</h2> <h3>Development[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=19" title="Edit section: Development">edit</a>]</h3> <p>Developmental epigenetics can be divided into predetermined and probabilistic epigenesis. Predetermined epigenesis is a unidirectional movement from structural development in DNA to the functional maturation of the protein. "Predetermined" here means that development is scripted and predictable. Probabilistic epigenesis on the other hand is a bidirectional structure-function development with experiences and external molding development.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Griesemer_2005-84">[84]</a></sup></p> <p>Somatic epigenetic inheritance, particularly through DNA and histone covalent modifications and <a href="https://en.wikipedia.org/wiki/Nucleosome" title="Nucleosome">nucleosome</a> repositioning, is very important in the development of multicellular eukaryotic organisms.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Teif_2014-83">[83]</a></sup> The genome sequence is static (with some notable exceptions), but cells differentiate into many different types, which perform different functions, and respond differently to the environment and intercellular signalling. Thus, as individuals develop, <a href="https://en.wikipedia.org/wiki/Morphogen" title="Morphogen">morphogens</a> activate or silence genes in an epigenetically heritable fashion, giving cells a memory. In mammals, most cells terminally differentiate, with only <a href="https://en.wikipedia.org/wiki/Stem_cells" title="Stem cells">stem cells</a> retaining the ability to differentiate into several cell types ("totipotency" and "multipotency"). In <a href="https://en.wikipedia.org/wiki/Mammal" title="Mammal">mammals</a>, some stem cells continue producing new differentiated cells throughout life, such as in <a href="https://en.wikipedia.org/wiki/Epigenetic_Regulation_of_Neurogenesis" title="Epigenetic Regulation of Neurogenesis">neurogenesis</a>, but mammals are not able to respond to loss of some tissues, for example, the inability to regenerate limbs, which some other animals are capable of. Epigenetic modifications regulate the transition from neural stem cells to glial progenitor cells (for example, differentiation into oligodendrocytes is regulated by the deacetylation and methylation of histones.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-85">[85]</a></sup> Unlike animals, plant cells do not terminally differentiate, remaining totipotent with the ability to give rise to a new individual plant. While plants do utilise many of the same epigenetic mechanisms as animals, such as <a href="https://en.wikipedia.org/wiki/Chromatin_remodeling" title="Chromatin remodeling">chromatin remodeling</a>, it has been hypothesised that some kinds of plant cells do not use or require "cellular memories", resetting their gene expression patterns using positional information from the environment and surrounding cells to determine their fate.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17194589-86">[86]</a></sup></p> <p>Epigenetic changes can occur in response to environmental exposure – for example, mice given some dietary supplements have epigenetic changes affecting expression of the <a href="https://en.wikipedia.org/wiki/Agouti_gene" title="Agouti gene">agouti gene</a>, which affects their fur color, weight, and propensity to develop cancer.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid12163699-87">[87]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-waterland-88">[88]</a></sup></p> <p>Controversial results from one study suggested that traumatic experiences might produce an epigenetic signal that is capable of being passed to future generations. Mice were trained, using foot shocks, to fear a cherry blossom odor. The investigators reported that the mouse offspring had an increased aversion to this specific odor.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-89">[89]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-90">[90]</a></sup> They suggested epigenetic changes that increase gene expression, rather than in DNA itself, in a gene, M71, that governs the functioning of an odor receptor in the nose that responds specifically to this cherry blossom smell. There were physical changes that correlated with olfactory (smell) function in the brains of the trained mice and their descendants. Several criticisms were reported, including the study's low statistical power as evidence of some irregularity such as bias in reporting results.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-91">[91]</a></sup> Due to limits of sample size, there is a probability that an effect will not be demonstrated to within statistical significance even if it exists. The criticism suggested that the probability that all the experiments reported would show positive results if an identical protocol was followed, assuming the claimed effects exist, is merely 0.4%. The authors also did not indicate which mice were siblings, and treated all of the mice as statistically independent.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-92">[92]</a></sup> The original researchers pointed out negative results in the paper's appendix that the criticism omitted in its calculations, and undertook to track which mice were siblings in the future.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-93">[93]</a></sup></p> <h3>Transgenerational[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=20" title="Edit section: Transgenerational">edit</a>]</h3> <p>Main article: <a href="https://en.wikipedia.org/wiki/Transgenerational_epigenetic_inheritance" title="Transgenerational epigenetic inheritance">Transgenerational epigenetic inheritance</a></p> <p>Epigenetic mechanisms were a necessary part of the evolutionary origin of <a href="https://en.wikipedia.org/wiki/Cell_differentiation" title="Cell differentiation">cell differentiation</a>.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-isbn0-19-854968-7-94">[94]</a></sup> Although epigenetics in multicellular organisms is generally thought to be a mechanism involved in differentiation, with epigenetic patterns "reset" when organisms reproduce, there have been some observations of transgenerational epigenetic inheritance (e.g., the phenomenon of <a href="https://en.wikipedia.org/wiki/Paramutation" title="Paramutation">paramutation</a>observed in <a href="https://en.wikipedia.org/wiki/Maize" title="Maize">maize</a>). Although most of these multigenerational epigenetic traits are gradually lost over several generations, the possibility remains that multigenerational epigenetics could be another aspect to evolution and adaptation. As mentioned above, some define epigenetics as heritable.</p> <p>A sequestered germ line or <a href="https://en.wikipedia.org/wiki/Weismann_barrier" title="Weismann barrier">Weismann barrier</a> is specific to animals, and epigenetic inheritance is more common in plants and microbes. <a href="https://en.wikipedia.org/wiki/Eva_Jablonka" title="Eva Jablonka">Eva Jablonka</a>, <a href="https://en.wikipedia.org/wiki/Marion_J._Lamb" title="Marion J. Lamb">Marion J. Lamb</a> and Étienne Danchin have argued that these effects may require enhancements to the standard conceptual framework of the <a href="https://en.wikipedia.org/wiki/Modern_synthesis_(20th_century)" title="Modern synthesis (20th century)">modern synthesis</a> and have called for an <a href="https://en.wikipedia.org/wiki/Extended_evolutionary_synthesis" title="Extended evolutionary synthesis">extended evolutionary synthesis</a>.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-isbn0-262-10107-6-95">[95]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-96">[96]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-97">[97]</a></sup> Other evolutionary biologists, such as <a href="https://en.wikipedia.org/wiki/John_Maynard_Smith" title="John Maynard Smith">John Maynard Smith</a>, have incorporated epigenetic inheritance into <a href="https://en.wikipedia.org/wiki/Population_genetics" title="Population genetics">population genetics</a> models<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-98">[98]</a></sup> or are openly skeptical of the extended evolutionary synthesis (<a href="https://en.wikipedia.org/wiki/Michael_Lynch_(geneticist)" title="Michael Lynch (geneticist)">Michael Lynch</a>).<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-99">[99]</a></sup><a href="https://en.wikipedia.org/w/index.php?title=Thomas_Dickins&action=edit&redlink=1" title="Thomas Dickins (page does not exist)">Thomas Dickins</a> and <a href="https://en.wikipedia.org/w/index.php?title=Qazi_Rahman&action=edit&redlink=1" title="Qazi Rahman (page does not exist)">Qazi Rahman</a> state that epigenetic mechanisms such as DNA methylation and histone modification are genetically inherited under the control of <a href="https://en.wikipedia.org/wiki/Natural_selection" title="Natural selection">natural selection</a> and therefore fit under the earlier "<a href="https://en.wikipedia.org/wiki/Modern_synthesis_(20th_century)" title="Modern synthesis (20th century)">modern synthesis</a>".<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-100">[100]</a></sup></p> <p>Two important ways in which epigenetic inheritance can be different from traditional genetic inheritance, with important consequences for evolution, are that rates of epimutation can be much faster than rates of mutation<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-rando_and_verstrepen-101">[101]</a></sup> and the epimutations are more easily reversible.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-102">[102]</a></sup> In plants, heritable DNA methylation mutations are 100.000 times more likely to occur compared to DNA mutations.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-van_der_Graaf_et_al-103">[103]</a></sup>An epigenetically inherited element such as the <a href="https://en.wikipedia.org/wiki/PSI_(prion)" title="PSI (prion)">PSI+</a> system can act as a "stop-gap", good enough for short-term adaptation that allows the lineage to survive for long enough for mutation and/or recombination to <a href="https://en.wikipedia.org/wiki/Genetic_assimilation" title="Genetic assimilation">genetically assimilate</a> the adaptive phenotypic change.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-104">[104]</a></sup> The existence of this possibility increases the <a href="https://en.wikipedia.org/wiki/Evolvability" title="Evolvability">evolvability</a> of a species.</p> <p>More than 100 cases of <a href="https://en.wikipedia.org/wiki/Transgenerational_epigenetic_inheritance" title="Transgenerational epigenetic inheritance">transgenerational epigenetic inheritance</a> phenomena have been reported in a wide range of organisms, including prokaryotes, plants, and animals.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Jablonka09-105">[105]</a></sup> For instance, <a href="https://en.wikipedia.org/wiki/Nymphalis_antiopa" title="Nymphalis antiopa">mourning cloak butterflies</a> will change color through hormone changes in response to experimentation of varying temperatures.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-106">[106]</a></sup></p> <p>The filamentous fungus <em>Neurospora crassa</em> is a prominent model system for understanding the control and function of cytosine methylation. In this organism, DNA methylation is associated with relics of a genome defense system called RIP (repeat-induced point mutation) and silences gene expression by inhibiting transcription elongation.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19092133-107">[107]</a></sup></p> <p>The <a href="https://en.wikipedia.org/wiki/Yeast" title="Yeast">yeast</a> <a href="https://en.wikipedia.org/wiki/Prion" title="Prion">prion</a> PSI is generated by a conformational change of a translation termination factor, which is then inherited by daughter cells. This can provide a survival advantage under adverse conditions. This is an example of epigenetic regulation enabling unicellular organisms to respond rapidly to environmental stress. Prions can be viewed as epigenetic agents capable of inducing a phenotypic change without modification of the genome.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-JorgTost-108">[108]</a></sup></p> <p>Direct detection of epigenetic marks in microorganisms is possible with <a href="https://en.wikipedia.org/wiki/Single_molecule_real_time_sequencing" title="Single molecule real time sequencing">single molecule real time sequencing</a>, in which polymerase sensitivity allows for measuring methylation and other modifications as a DNA molecule is being sequenced.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-109">[109]</a></sup> Several projects have demonstrated the ability to collect genome-wide epigenetic data in bacteria.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-110">[110]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-111">[111]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-112">[112]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-113">[113]</a></sup></p> <h2>Epigenetics in bacteria[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=21" title="Edit section: Epigenetics in bacteria">edit</a>]</h2> <p><a href="https://en.wikipedia.org/wiki/File:Escherichia_coli_flagella_TEM.png"><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Escherichia_coli_flagella_TEM.png/150px-Escherichia_coli_flagella_TEM.png" style="height:224px; width:150px" /></a></p> <p><em>Escherichia coli</em>bacteria</p> <p>While epigenetics is of fundamental importance in <a href="https://en.wikipedia.org/wiki/Eukaryote" title="Eukaryote">eukaryotes</a>, especially <a href="https://en.wikipedia.org/wiki/Multicellular_organism" title="Multicellular organism">metazoans</a>, it plays a different role in bacteria. Most importantly, eukaryotes use epigenetic mechanisms primarily to regulate gene expression which bacteria rarely do. However, bacteria make widespread use of postreplicative DNA methylation for the epigenetic control of DNA-protein interactions. Bacteria also use DNA <a href="https://en.wikipedia.org/wiki/Adenine" title="Adenine">adenine</a> methylation (rather than DNA <a href="https://en.wikipedia.org/wiki/Cytosine" title="Cytosine">cytosine</a> methylation) as an epigenetic signal. DNA adenine methylation is important in bacteria virulence in organisms such as <em><a href="https://en.wikipedia.org/wiki/Escherichia_coli" title="Escherichia coli">Escherichia coli</a></em>, <em><a href="https://en.wikipedia.org/wiki/Salmonella" title="Salmonella">Salmonella</a>, <a href="https://en.wikipedia.org/wiki/Vibrio" title="Vibrio">Vibrio</a>, <a href="https://en.wikipedia.org/wiki/Yersinia" title="Yersinia">Yersinia</a>, <a href="https://en.wikipedia.org/wiki/Haemophilus" title="Haemophilus">Haemophilus</a></em>, and <em><a href="https://en.wikipedia.org/wiki/Brucella" title="Brucella">Brucella</a></em>. In <em><a href="https://en.wikipedia.org/wiki/Alphaproteobacteria" title="Alphaproteobacteria">Alphaproteobacteria</a></em>, methylation of adenine regulates the cell cycle and couples gene transcription to DNA replication. In <em><a href="https://en.wikipedia.org/wiki/Gammaproteobacteria" title="Gammaproteobacteria">Gammaproteobacteria</a></em>, adenine methylation provides signals for DNA replication, chromosome segregation, mismatch repair, packaging of bacteriophage, transposase activity and regulation of gene expression.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-JorgTost-108">[108]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Casadesus-114">[114]</a></sup> There exists a genetic switch controlling <em><a href="https://en.wikipedia.org/wiki/Streptococcus_pneumoniae" title="Streptococcus pneumoniae">Streptococcus pneumoniae</a></em> (the pneumococcus) that allows the bacterium to randomly change its characteristics into six alternative states that could pave the way to improved vaccines. Each form is randomly generated by a phase variable methylation system. The ability of the pneumococcus to cause deadly infections is different in each of these six states. Similar systems exist in other bacterial genera.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-MansoOggioni2014-115">[115]</a></sup></p> <h2>Medicine[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=22" title="Edit section: Medicine">edit</a>]</h2> <p>Epigenetics has many and varied potential medical applications.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid21447282-116">[116]</a></sup> In 2008, the National Institutes of Health announced that $190 million had been earmarked for epigenetics research over the next five years. In announcing the funding, government officials noted that epigenetics has the potential to explain mechanisms of aging, human development, and the origins of cancer, heart disease, mental illness, as well as several other conditions. Some investigators, like <a href="https://en.wikipedia.org/wiki/Randy_Jirtle" title="Randy Jirtle">Randy Jirtle</a>, PhD, of Duke University Medical Center, think epigenetics may ultimately turn out to have a greater role in disease than genetics.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-117">[117]</a></sup></p> <h3>Twins[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=23" title="Edit section: Twins">edit</a>]</h3> <p>Direct comparisons of identical twins constitute an optimal model for interrogating environmental epigenetics. In the case of humans with different environmental exposures, monozygotic (identical) twins were epigenetically indistinguishable during their early years, while older twins had remarkable differences in the overall content and genomic distribution of 5-methylcytosine DNA and histone acetylation.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Moore_2015-8">[8]</a></sup> The twin pairs who had spent less of their lifetime together and/or had greater differences in their medical histories were those who showed the largest differences in their levels of 5-methylcytosine DNA and acetylation of histones H3 and H4.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid16009939-118">[118]</a></sup></p> <p>Dizygotic (fraternal) and monozygotic (identical) twins show evidence of epigenetic influence in humans.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid16009939-118">[118]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19151718-119">[119]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-120">[120]</a></sup> DNA sequence differences that would be abundant in a singleton-based study do not interfere with the analysis. Environmental differences can produce long-term epigenetic effects, and different developmental monozygotic twin subtypes may be different with respect to their susceptibility to be discordant from an epigenetic point of view.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid19653134-121">[121]</a></sup></p> <p>A high-throughput study, which denotes technology that looks at extensive genetic markers, focused on epigenetic differences between monozygotic twins to compare global and locus-specific changes in DNA methylation and histone modifications in a sample of 40 monozygotic twin pairs.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid16009939-118">[118]</a></sup> In this case, only healthy twin pairs were studied, but a wide range of ages was represented, between 3 and 74 years. One of the major conclusions from this study was that there is an age-dependent accumulation of epigenetic differences between the two siblings of twin pairs. This accumulation suggests the existence of epigenetic “drift”. Epigenetic drift is the term given to epigenetic modifications as they occur as a direct function with age. While age is a known risk factor for many diseases, age-related methylation has been found to occur differentially at specific sites along the genome. Over time, this can result in measurable differences between biological and chronological age. Epigenetic changes have been found to be reflective of lifestyle and may act as functional biomarkers of disease before clinical threshold is reached.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-122">[122]</a></sup></p> <p>A more recent study, where 114 monozygotic twins and 80 dizygotic twins were analyzed for the DNA methylation status of around 6000 unique genomic regions, concluded that epigenetic similarity at the time of blastocyst splitting may also contribute to phenotypic similarities in monozygotic co-twins. This supports the notion that microenvironment at early stages of embryonic development can be quite important for the establishment of epigenetic marks.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-123">[123]</a></sup> Congenital genetic disease is well understood and it is clear that epigenetics can play a role, for example, in the case of <a href="https://en.wikipedia.org/wiki/Angelman_syndrome" title="Angelman syndrome">Angelman syndrome</a> and <a href="https://en.wikipedia.org/wiki/Prader-Willi_syndrome" title="Prader-Willi syndrome">Prader-Willi syndrome</a>. These are normal genetic diseases caused by gene deletions or inactivation of the genes, but are unusually common because individuals are essentially <a href="https://en.wikipedia.org/wiki/Hemizygous" title="Hemizygous">hemizygous</a> because of <a href="https://en.wikipedia.org/wiki/Genomic_imprinting" title="Genomic imprinting">genomic imprinting</a>, and therefore a single gene knock out is sufficient to cause the disease, where most cases would require both copies to be knocked out.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-124">[124]</a></sup></p> <h3>Genomic imprinting[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=24" title="Edit section: Genomic imprinting">edit</a>]</h3> <p>Further information: <a href="https://en.wikipedia.org/wiki/Genomic_imprinting" title="Genomic imprinting">Genomic imprinting</a></p> <p>Some human disorders are associated with <a href="https://en.wikipedia.org/wiki/Genomic_imprinting" title="Genomic imprinting">genomic imprinting</a>, a phenomenon in mammals where the father and mother contribute different epigenetic patterns for specific genomic loci in their <a href="https://en.wikipedia.org/wiki/Germ_cells" title="Germ cells">germ cells</a>.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid17121465-125">[125]</a></sup> The best-known case of imprinting in human disorders is that of <a href="https://en.wikipedia.org/wiki/Angelman_syndrome" title="Angelman syndrome">Angelman syndrome</a> and <a href="https://en.wikipedia.org/wiki/Prader-Willi_syndrome" title="Prader-Willi syndrome">Prader-Willi syndrome</a> – both can be produced by the same genetic mutation, <a href="https://en.wikipedia.org/wiki/Chromosome_15q_partial_deletion" title="Chromosome 15q partial deletion">chromosome 15q partial deletion</a>, and the particular syndrome that will develop depends on whether the mutation is inherited from the child's mother or from their father.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid2564739-126">[126]</a></sup> This is due to the presence of genomic imprinting in the region. <a href="https://en.wikipedia.org/wiki/Beckwith-Wiedemann_syndrome" title="Beckwith-Wiedemann syndrome">Beckwith-Wiedemann syndrome</a> is also associated with genomic imprinting, often caused by abnormalities in maternal genomic imprinting of a region on chromosome 11.</p> <p><a href="https://en.wikipedia.org/wiki/Rett_syndrome" title="Rett syndrome">Rett syndrome</a> is underlain by mutations in the <a href="https://en.wikipedia.org/wiki/MECP2" title="MECP2">MECP2</a> gene despite no large-scale changes in expression of MeCP2 being found in microarray analyses. <a href="https://en.wikipedia.org/wiki/BDNF" title="BDNF">BDNF</a> is downregulated in the MECP2 mutant resulting in Rett syndrome.</p> <p>In the <a href="https://en.wikipedia.org/wiki/%C3%96verkalix_study" title="Överkalix study">Överkalix study</a>, paternal (but not maternal) grandsons<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-paternal-grandson-127">[127]</a></sup> of Swedish men who were exposed during preadolescence to famine in the 19th century were less likely to die of cardiovascular disease. If food was plentiful, then <a href="https://en.wikipedia.org/wiki/Diabetes" title="Diabetes">diabetes</a> mortality in the grandchildren increased, suggesting that this was a transgenerational epigenetic inheritance.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid16391557-128">[128]</a></sup> The opposite effect was observed for females – the paternal (but not maternal) granddaughters of women who experienced famine while in the womb (and therefore while their eggs were being formed) lived shorter lives on average.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-129">[129]</a></sup></p> <h3>Cancer[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=25" title="Edit section: Cancer">edit</a>]</h3> <p>Further information: <a href="https://en.wikipedia.org/wiki/Cancer_epigenetics" title="Cancer epigenetics">Cancer epigenetics</a></p> <p>A variety of epigenetic mechanisms can be perturbed in different types of cancer. Epigenetic alterations of DNA repair genes or cell cycle control genes are very frequent in sporadic (non-germ line) cancers, being significantly more common than germ line (familial) <a href="https://en.wikipedia.org/wiki/Mutation" title="Mutation">mutations</a> in these sporadic cancers.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-130">[130]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-131">[131]</a></sup> Epigenetic alterations are important in cellular transformation to cancer, and their manipulation holds great promise for cancer prevention, detection, and therapy.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Novak-132">[132]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid22735547-133">[133]</a></sup> Several medications which have epigenetic impact are used in several of these diseases. These aspects of epigenetics are addressed in <a href="https://en.wikipedia.org/wiki/Cancer_epigenetics" title="Cancer epigenetics">cancer epigenetics</a>.</p> <h3>Diabetic wound healing[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=26" title="Edit section: Diabetic wound healing">edit</a>]</h3> <p>Epigenetic modifications have given insight into the understanding of the pathophysiology of different disease conditions. Though, they are strongly associated with cancer, their role in other pathological conditions are of equal importance. It appears that, the hyperglycaemic environment could imprint such changes at the genomic level, that macrophages are primed towards a pro-inflammatory state and could fail to exhibit any phenotypic alteration towards the pro-healing type. This phenomenon of altered Macrophage Polarization is mostly associated with all the diabetic complications in a clinical set-up. At present, several reports reveal the relevance of different epigenetic modifications with respect to diabetic complications. Sooner or later, with the advancements in biomedical tools, the detection of such biomarkers as prognostic and diagnostic tools in patients could possibly emerge out as alternative approaches. It is noteworthy to mention here that the use of epigenetic modifications as therapeutic targets warrant extensive preclinical as well as clinical evaluation prior to use.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-134">[134]</a></sup></p> <h2>Psychology and psychiatry[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=27" title="Edit section: Psychology and psychiatry">edit</a>]</h2> <h3>Early life stress[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=28" title="Edit section: Early life stress">edit</a>]</h3> <p>In a groundbreaking 2003 report, Caspi and colleagues demonstrated that in a robust cohort of over one-thousand subjects assessed multiple times from preschool to adulthood, subjects who carried one or two copies of the short allele of the serotonin transporter promoter polymorphism exhibited higher rates of adult depression and suicidality when exposed to childhood maltreatment when compared to long allele homozygotes with equal ELS exposure.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-ReferenceA-135">[135]</a></sup></p> <p>Parental nutrition, in utero exposure to stress, male-induced maternal effects such as attraction of differential mate quality, and maternal as well as paternal age, and offspring gender could all possibly influence whether a germline epimutation is ultimately expressed in offspring and the degree to which intergenerational inheritance remains stable throughout posterity.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-ReferenceB-136">[136]</a></sup></p> <h3>Addiction[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=29" title="Edit section: Addiction">edit</a>]</h3> <p><a href="https://en.wikipedia.org/wiki/Addiction" title="Addiction">Addiction</a> is a disorder of the brain's <a href="https://en.wikipedia.org/wiki/Reward_system" title="Reward system">reward system</a> which arises through <a href="https://en.wikipedia.org/wiki/Transcriptional" title="Transcriptional">transcriptional</a> and neuroepigenetic mechanisms and occurs over time from chronically high levels of exposure to an addictive stimulus (e.g., morphine, cocaine, sexual intercourse, gambling, etc.).<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Nestler-137">[137]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Cellular_basis-138">[138]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-What_the_%CE%94FosB?-139">[139]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-G9a_reverses_%CE%94FosB_plasticity-140">[140]</a></sup> Transgenerational epigenetic inheritance of addictive <a href="https://en.wikipedia.org/wiki/Phenotypes" title="Phenotypes">phenotypes</a> has been noted to occur in preclinical studies.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid23920159-141">[141]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid26572641-142">[142]</a></sup></p> <h3>Anxiety[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=30" title="Edit section: Anxiety">edit</a>]</h3> <p>Transgenerational epigenetic inheritance of anxiety-related phenotypes has been reported in a preclinical study using mice.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-:0-143">[143]</a></sup> In this investigation, transmission of paternal stress-induced traits across generations involved small non-coding RNA signals transmitted via the male germline.</p> <h3>Depression[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=31" title="Edit section: Depression">edit</a>]</h3> <p>Epigenetic inheritance of depression-related phenotypes has also been reported in a preclinical study.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-:0-143">[143]</a></sup> Inheritance of paternal stress-induced traits across generations involved small non-coding RNA signals transmitted via the paternal germline.</p> <h3>Fear conditioning[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=32" title="Edit section: Fear conditioning">edit</a>]</h3> <p>Studies on mice have shown that certain conditional fears can be inherited from either parent. In one example, mice were conditioned to fear a strong scent, <a href="https://en.wikipedia.org/wiki/Acetophenone" title="Acetophenone">acetophenone</a>, by accompanying the smell with an electric shock. Consequently, the mice learned to fear the scent of acetophenone alone. It was discovered that this fear could be passed down to the mice offspring. Despite the offspring never experiencing the electric shock themselves the mice still displayed a fear of the acetophenone scent, because they inherited the fear epigenetically by site-specific DNA methylation. These epigenetic changes lasted up to two generations without reintroducing the shock.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-Szyf2014-144">[144]</a></sup></p> <h2>Research[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=33" title="Edit section: Research">edit</a>]</h2> <p>The two forms of heritable information, namely genetic and epigenetic, are collectively denoted as dual inheritance. Members of the APOBEC/AID family of <a href="https://en.wikipedia.org/wiki/Cytosine_deaminase" title="Cytosine deaminase">cytosine deaminases</a> may concurrently influence genetic and epigenetic inheritance using similar molecular mechanisms, and may be a point of crosstalk between these conceptually compartmentalized processes.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-pmid20800313-145">[145]</a></sup></p> <p><a href="https://en.wikipedia.org/wiki/Fluoroquinolone" title="Fluoroquinolone">Fluoroquinolone</a> antibiotics induce epigenetic changes in <a href="https://en.wikipedia.org/wiki/Mammalian" title="Mammalian">mammalian</a> cells through iron <a href="https://en.wikipedia.org/wiki/Chelation" title="Chelation">chelation</a>. This leads to epigenetic effects through inhibition of α-ketoglutarate-dependent <a href="https://en.wikipedia.org/wiki/Dioxygenases" title="Dioxygenases">dioxygenases</a> that require <a href="https://en.wikipedia.org/wiki/Iron" title="Iron">iron</a> as a co-factor.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-146">[146]</a></sup></p> <p>Various pharmacological agents are applied for the production of induced pluripotent stem cells (iPSC) or maintain the embryonic stem cell (ESC) phenotypic via epigenetic approach. Adult stem cells like bone marrow stem cells have also shown a potential to differentiate into cardiac competent cells when treated with G9a histone methyltransferase inhibitor BIX01294.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-147">[147]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-148">[148]</a></sup></p> <h2>Pseudoscience[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=34" title="Edit section: Pseudoscience">edit</a>]</h2> <p>Due to epigenetics being in the early stages of development as a science and the <a href="https://en.wikipedia.org/wiki/Sensationalism" title="Sensationalism">sensationalism</a> surrounding it in the public media, <a href="https://en.wikipedia.org/wiki/David_Gorski" title="David Gorski">David Gorski</a> and geneticist <a href="https://en.wikipedia.org/wiki/Adam_Rutherford" title="Adam Rutherford">Adam Rutherford</a> advised caution against proliferation of false and <a href="https://en.wikipedia.org/wiki/Pseudoscience" title="Pseudoscience">pseudoscientific</a> conclusions by <a href="https://en.wikipedia.org/wiki/New_age" title="New age">new age</a> authors who make unfounded suggestions that a person's genes and health can be manipulated by <a href="https://en.wikipedia.org/wiki/Brainwashing" title="Brainwashing">mind control</a>. Misuse of the scientific term by <a href="https://en.wikipedia.org/wiki/Quackery" title="Quackery">quack authors</a> has produced misinformation to the general public.<sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-guardian-149">[149]</a></sup><sup><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_note-150">[150]</a></sup></p> <h2>See also[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=35" title="Edit section: See also">edit</a>]</h2> <ul> <li><a href="https://en.wikipedia.org/wiki/File:Issoria_lathonia.jpg"><img alt="icon" src="https://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Issoria_lathonia.jpg/32px-Issoria_lathonia.jpg" style="height:23px; width:32px" /></a><a href="https://en.wikipedia.org/wiki/Portal:Biology" title="Portal:Biology">Biology portal</a></li> <li><a href="https://en.wikipedia.org/wiki/File:1axc_tricolor.png"><img alt="icon" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/61/1axc_tricolor.png/26px-1axc_tricolor.png" style="height:28px; width:26px" /></a><a href="https://en.wikipedia.org/wiki/Portal:MCB" title="Portal:MCB">MCB portal</a></li> <li><img alt="icon" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/WHO_Rod.svg/12px-WHO_Rod.svg.png" style="height:28px; width:12px" /><a href="https://en.wikipedia.org/wiki/Portal:Medicine" title="Portal:Medicine">Medicine portal</a></li> <li><a href="https://en.wikipedia.org/wiki/File:Tabletten.JPG"><img alt="icon" src="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5f/Tabletten.JPG/32px-Tabletten.JPG" style="height:26px; width:32px" /></a><a href="https://en.wikipedia.org/wiki/Portal:Pharmacy_and_Pharmacology" title="Portal:Pharmacy and Pharmacology">Pharmacy and Pharmacology portal</a></li></ul> <ul> <li><a href="https://en.wikipedia.org/wiki/Baldwin_effect" title="Baldwin effect">Baldwin effect</a></li> <li><a href="https://en.wikipedia.org/wiki/Behavioral_epigenetics" title="Behavioral epigenetics">Behavioral epigenetics</a></li> <li><a href="https://en.wikipedia.org/wiki/Biological_effects_of_radiation_on_the_epigenome" title="Biological effects of radiation on the epigenome">Biological effects of radiation on the epigenome</a></li> <li><a href="https://en.wikipedia.org/wiki/Computational_epigenetics" title="Computational epigenetics">Computational epigenetics</a></li> <li><a href="https://en.wikipedia.org/wiki/Contribution_of_epigenetic_modifications_to_evolution" title="Contribution of epigenetic modifications to evolution">Contribution of epigenetic modifications to evolution</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenesis_(biology)" title="Epigenesis (biology)">Epigenesis (biology)</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics_in_forensic_science" title="Epigenetics in forensic science">Epigenetics in forensic science</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetic_therapy" title="Epigenetic therapy">Epigenetic therapy</a></li> <li><a href="https://en.wikipedia.org/wiki/Epigenetics_of_neurodegenerative_diseases" title="Epigenetics of neurodegenerative diseases">Epigenetics of neurodegenerative diseases</a></li> <li><a href="https://en.wikipedia.org/wiki/Lamarckism" title="Lamarckism">Lamarckism</a></li> <li><a href="https://en.wikipedia.org/wiki/Nutriepigenomics" title="Nutriepigenomics">Nutriepigenomics</a></li> <li><a href="https://en.wikipedia.org/wiki/Position-effect_variegation" title="Position-effect variegation">Position-effect variegation</a></li> <li><a href="https://en.wikipedia.org/wiki/Preformationism" title="Preformationism">Preformationism</a></li> <li><a href="https://en.wikipedia.org/wiki/Somatic_epitype" title="Somatic epitype">Somatic epitype</a></li> <li><a href="https://en.wikipedia.org/wiki/Synthetic_genetic_array" title="Synthetic genetic array">Synthetic genetic array</a></li></ul> <h2>References[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=36" title="Edit section: References">edit</a>]</h2> <ol> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Epigenetics_2009_review_1-0" title="Jump up">^</a></strong> <cite>Dupont C, Armant DR, Brenner CA (September 2009). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2791696" rel="nofollow">"Epigenetics: definition, mechanisms and clinical perspective"</a>. <em>Seminars in Reproductive Medicine</em>. <strong>27</strong> (5): 351–57. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1055%2Fs-0029-1237423" rel="nofollow">10.1055/s-0029-1237423</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2791696" rel="nofollow">2791696</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19711245" rel="nofollow">19711245</a>. <q>In the original sense of this definition, epigenetics referred to all molecular pathways modulating the expression of a genotype into a particular phenotype. Over the following years, with the rapid growth of genetics, the meaning of the word has gradually narrowed. Epigenetics has been defined and today is generally accepted as "the study of changes in gene function that are mitotically and/or meiotically heritable and that do not entail a change in DNA sequence."</q></cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-2" title="Jump up">^</a></strong> <cite><a href="https://www.theguardian.com/science/2015/jul/19/epigenetics-dna--darwin-adam-rutherford" rel="nofollow">"Beware the pseudo gene genies"</a>. <em><a href="https://en.wikipedia.org/wiki/The_Guardian" title="The Guardian">The Guardian</a></em>. 19 July 2015.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-nature2008_3-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-nature2008_3-1"><sup><em><strong>b</strong></em></sup></a> <cite>Ledford H (2008). "Disputed definitions". <em>Nature</em>. <strong>455</strong> (7216): 1023–28. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2F4551023a" rel="nofollow">10.1038/4551023a</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/18948925" rel="nofollow">18948925</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid19339683_4-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid19339683_4-1"><sup><em><strong>b</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid19339683_4-2"><sup><em><strong>c</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid19339683_4-3"><sup><em><strong>d</strong></em></sup></a> <cite>Berger SL, Kouzarides T, Shiekhattar R, Shilatifard A (2009). <a href="http://genesdev.cshlp.org/content/23/7/781.full" rel="nofollow">"An operational definition of epigenetics"</a>. <em><a href="https://en.wikipedia.org/wiki/Genes_%26_Development" title="Genes & Development">Genes & Development</a></em>. <strong>23</strong> (7): 781–83. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1101%2Fgad.1787609" rel="nofollow">10.1101/gad.1787609</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3959995" rel="nofollow">3959995</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19339683" rel="nofollow">19339683</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid17522671_5-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid17522671_5-1"><sup><em><strong>b</strong></em></sup></a> <cite>Bird A (May 2007). "Perceptions of epigenetics". <em><a href="https://en.wikipedia.org/wiki/Nature_(journal)" title="Nature (journal)">Nature</a></em>. <strong>447</strong>(7143): 396–98. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/2007Natur.447..396B" rel="nofollow">2007Natur.447..396B</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fnature05913" rel="nofollow">10.1038/nature05913</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17522671" rel="nofollow">17522671</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-6" title="Jump up">^</a></strong> <cite>Hunter, Philip (1 May 2008). <a href="https://web.archive.org/web/20080501094940/http://www.prospect-magazine.co.uk/article_details.php?id=10140" rel="nofollow">"What genes remember"</a>. <em>Prospect Magazine</em>. Web.archive.org. Archived from <a href="http://www.prospect-magazine.co.uk/article_details.php?id=10140" rel="nofollow">the original</a>on 1 May 2008. Retrieved 26 July 2012.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid17522676_7-0" title="Jump up">^</a></strong> <cite>Reik W (May 2007). "Stability and flexibility of epigenetic gene regulation in mammalian development". <em>Nature</em>. <strong>447</strong> (7143): 425–32. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/2007Natur.447..425R" rel="nofollow">2007Natur.447..425R</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fnature05918" rel="nofollow">10.1038/nature05918</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17522676" rel="nofollow">17522676</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Moore_2015_8-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Moore_2015_8-1"><sup><em><strong>b</strong></em></sup></a> <cite>Moore, David S. (2015). <a href="https://global.oup.com/academic/product/the-developing-genome-9780199922345?cc=us&lang=en&" rel="nofollow"><em>The Developing Genome: An Introduction to Behavioral Epigenetics</em></a> (1st ed.). Oxford University Press. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/978-0199922345" title="Special:BookSources/978-0199922345">978-0199922345</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-NIH_9-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-NIH_9-1"><sup><em><strong>b</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-NIH_9-2"><sup><em><strong>c</strong></em></sup></a> <cite><a href="http://www.roadmapepigenomics.org/overview" rel="nofollow">"Overview"</a>. <em>NIH Roadmap Epigenomics Project</em>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-10" title="Jump up">^</a></strong> <a href="https://en.wikipedia.org/wiki/Oxford_English_Dictionary" title="Oxford English Dictionary">Oxford English Dictionary</a>: "The word is used by W. Harvey, <em>Exercitationes</em> 1651, p. 148, and in the <em>English Anatomical Exercitations</em> 1653, p. 272. It is explained to mean ‘partium super-exorientium additamentum’, ‘the additament of parts budding one out of another’."</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-waddington_11-0" title="Jump up">^</a></strong> <cite>Waddington, C. H. (1942). "The epigenotype". <em>Endeavour</em>. <strong>1</strong>: 18–20.</cite> "For the purpose of a study of inheritance, the relation between phenotypes and genotypes [...] is, from a wider biological point of view, of crucial importance, since it is the kernel of the whole problem of development. Many geneticists have recognized this and attempted to discover the processes involved in the mechanism by which the genes of the genotype bring about phenotypic effects. The first step in such an enterprise is – or rather should be, since it is often omitted by those with an undue respect for the powers of reason – to describe what can be seen of the developmental processes. For enquiries of this kind, the word 'phenogenetics' was coined by Haecker [1918, <em>Phänogenetik</em>]. The second and more important part of the task is to discover the causal mechanisms at work, and to relate them as far as possible to what experimental embryology has already revealed of the mechanics of development. We might use the name 'epigenetics' for such studies, thus emphasizing their relation to the concepts, so strongly favourable to the classical theory of epigenesis, which have been reached by the experimental embryologists. We certainly need to remember that between genotype and phenotype, and connecting them to each other, there lies a whole complex of developmental processes. It is convenient to have a name for this complex: 'epigenotype' seems suitable."</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-12" title="Jump up">^</a></strong> See <em><a href="https://en.wikipedia.org/wiki/Preformationism" title="Preformationism">preformationism</a></em> for historical background. <em><a href="https://en.wikipedia.org/wiki/Oxford_English_Dictionary" title="Oxford English Dictionary">Oxford English Dictionary</a></em>: "the theory that the germ is brought into existence (by successive accretions), and not merely developed, in the process of reproduction. [...] The opposite theory was formerly known as the 'theory of evolution'; to avoid the ambiguity of this name, it is now spoken of chiefly as the 'theory of preformation', sometimes as that of 'encasement' or 'emboîtement'."</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Waddington2014_13-0" title="Jump up">^</a></strong> <cite>Waddington, C. H. (1953). <a href="https://books.google.com/books?id=lqKTBQAAQBAJ&pg=PR1" rel="nofollow"><em>The Epigenetics of Birds</em></a>. Cambridge University Press. pp. 1–. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/978-1-107-44047-0" title="Special:BookSources/978-1-107-44047-0">978-1-107-44047-0</a>.</cite>(2014 edition)</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-14" title="Jump up">^</a></strong> <cite>Hall BK (15 January 2004). "In search of evolutionary developmental mechanisms: the 30-year gap between 1944 and 1974". <em>302</em>. <strong>302</strong> (1): 5–18. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1002%2Fjez.b.20002" rel="nofollow">10.1002/jez.b.20002</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/14760651" rel="nofollow">14760651</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-15" title="Jump up">^</a></strong> <cite>Alvarez-Buylla ER, Chaos A, Aldana M, Benítez M, Cortes-Poza Y, Espinosa-Soto C, Hartasánchez DA, Lotto RB, Malkin D, Escalera Santos GJ, Padilla-Longoria P (November 3, 2008). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2572848" rel="nofollow">"Floral Morphogenesis: Stochastic Explorations of a Gene Network Epigenetic Landscape"</a>. <em>PLoS ONE</em>. <strong>3</strong> (11): e3626. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/2008PLoSO...3.3626A" rel="nofollow">2008PLoSO...3.3626A</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1371%2Fjournal.pone.0003626" rel="nofollow">10.1371/journal.pone.0003626</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2572848" rel="nofollow">2572848</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/18978941" rel="nofollow">18978941</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-sciencedirect.com_16-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-sciencedirect.com_16-1"><sup><em><strong>b</strong></em></sup></a> <cite>Rabajante JF, Babierra AL (January 30, 2015). "Branching and oscillations in the epigenetic landscape of cell-fate determination". <em>Progress in Biophysics and Molecular Biology</em>. <strong>117</strong>(2–3): 240–49. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2Fj.pbiomolbio.2015.01.006" rel="nofollow">10.1016/j.pbiomolbio.2015.01.006</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/25641423" rel="nofollow">25641423</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-17" title="Jump up">^</a></strong> <cite>Gottlieb, G. (1991). "Epigenetic systems view of human development". <em>Developmental Psychology</em>. <strong>27</strong> (1): 33–34. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1037%2F0012-1649.27.1.33" rel="nofollow">10.1037/0012-1649.27.1.33</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-18" title="Jump up">^</a></strong> Gilbert Gottlieb. <a href="http://chd.ucsd.edu/_files/winter2009/Gottlieb.probabilistic.pdf" rel="nofollow">Probabilistic epigenesis</a>, Developmental Science 10:1 (2007), 1–11</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Boeree1997_19-0" title="Jump up">^</a></strong> Boeree, C. George, (1997/2006), <a href="http://www.social-psychology.de/do/pt_erikson.pdf" rel="nofollow"><em>Personality Theories, Erik Erikson</em></a></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-20" title="Jump up">^</a></strong> <cite>Erikson, Erik (1968). <em>Identity: Youth and Crisis</em>. Chapter 3: W.W. Norton and Company. p. 92.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-21" title="Jump up">^</a></strong> <cite><a href="http://www.bio-medicine.org/biology-definition/Epigenetics" rel="nofollow">"Epigenetics"</a>. Bio-Medicine.org. Retrieved 21 May 2011.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid2265224_22-0" title="Jump up">^</a></strong> <cite>Holliday R (Jan 30, 1990). "DNA Methylation and Epigenetic Inheritance". <em>Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences</em>. <strong>326</strong> (1235): 329–38. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/1990RSPTB.326..329H" rel="nofollow">1990RSPTB.326..329H</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1098%2Frstb.1990.0015" rel="nofollow">10.1098/rstb.1990.0015</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-isbn0-87969-490-4_23-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-isbn0-87969-490-4_23-1"><sup><em><strong>b</strong></em></sup></a> <cite>Riggs AD, Russo VE, Martienssen RA (1996). <em>Epigenetic mechanisms of gene regulation</em>. Plainview, NY: Cold Spring Harbor Laboratory Press. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/0-87969-490-4" title="Special:BookSources/0-87969-490-4">0-87969-490-4</a>.</cite><sup>[<em><a href="https://en.wikipedia.org/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources">page needed</a></em>]</sup></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid17320501_24-0" title="Jump up">^</a></strong> <cite>Chandler VL (February 2007). "Paramutation: from maize to mice". <em>Cell</em>. <strong>128</strong> (4): 641–45. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2Fj.cell.2007.02.007" rel="nofollow">10.1016/j.cell.2007.02.007</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17320501" rel="nofollow">17320501</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-25" title="Jump up">^</a></strong> <cite>Kovalchuk O, Baulch JE (January 2008). "Epigenetic changes and nontargeted radiation effects – is there a link?". <em>Environ. Mol. Mutagen</em>. <strong>49</strong> (1): 16–25. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1002%2Fem.20361" rel="nofollow">10.1002/em.20361</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/18172877" rel="nofollow">18172877</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-26" title="Jump up">^</a></strong> <cite>Ilnytskyy Y, Kovalchuk O (September 2011). "Non-targeted radiation effects-an epigenetic connection". <em>Mutat. 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"Prions as adaptive conduits of memory and inheritance". <em>Nature Reviews Genetics</em>. <strong>6</strong> (6): 435–50. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fnrg1616" rel="nofollow">10.1038/nrg1616</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/15931169" rel="nofollow">15931169</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-78" title="Jump up">^</a></strong> <cite>Giacomelli MG; Hancock AS; <a href="https://en.wikipedia.org/wiki/Joanna_Masel" title="Joanna Masel">Masel J</a> (2007). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1808353" rel="nofollow">"The conversion of 3′ UTRs into coding regions"</a>. <em>Molecular Biology & Evolution</em>. <strong>24</strong>(2): 457–64. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1093%2Fmolbev%2Fmsl172" rel="nofollow">10.1093/molbev/msl172</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1808353" rel="nofollow">1808353</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17099057" rel="nofollow">17099057</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-79" title="Jump up">^</a></strong> <cite>Lancaster AK, Bardill JP, True HL, Masel J (2010). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2828720" rel="nofollow">"The Spontaneous Appearance Rate of the Yeast Prion PSI+ and Its Implications for the Evolution of the Evolvability Properties of the PSI+ System"</a>. <em>Genetics</em>. <strong>184</strong> (2): 393–400. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1534%2Fgenetics.109.110213" rel="nofollow">10.1534/genetics.109.110213</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2828720" rel="nofollow">2828720</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19917766" rel="nofollow">19917766</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid1804215_80-0" title="Jump up">^</a></strong> <cite>Sapp J (1991). "Concepts of organization. The leverage of ciliate protozoa". <em>Dev. Biol</em>. <strong>7</strong>: 229–58. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1007%2F978-1-4615-6823-0_11" rel="nofollow">10.1007/978-1-4615-6823-0_11</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/1804215" rel="nofollow">1804215</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-isbn0-19-515619-6_81-0" title="Jump up">^</a></strong> <cite>Sapp J (2003). <em>Genesis: the evolution of biology</em>. Oxford [Oxfordshire]: Oxford University Press. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/0-19-515619-6" title="Special:BookSources/0-19-515619-6">0-19-515619-6</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-isbn0-262-65063-0_82-0" title="Jump up">^</a></strong> <cite>Gray RD, Oyama S, Griffiths PE (2003). <em>Cycles of Contingency: Developmental Systems and Evolution (Life and Mind: Philosophical Issues in Biology and Psychology)</em>. Cambridge, Massachusetts: The MIT Press. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/0-262-65063-0" title="Special:BookSources/0-262-65063-0">0-262-65063-0</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Teif_2014_83-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Teif_2014_83-1"><sup><em><strong>b</strong></em></sup></a> <cite>Teif VB, Beshnova DA, Vainshtein Y, Marth C, Mallm JP, Höfer T, Rippe K (8 May 2014). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4120082" rel="nofollow">"Nucleosome repositioning links DNA (de)methylation and differential CTCF binding during stem cell development"</a>. <em>Genome Research</em>. <strong>24</strong>: 1285–95. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1101%2Fgr.164418.113" rel="nofollow">10.1101/gr.164418.113</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4120082" rel="nofollow">4120082</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/24812327" rel="nofollow">24812327</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Griesemer_2005_84-0" title="Jump up">^</a></strong> <cite>Griesemer J, Haber MH, Yamashita G, Gannett L (March 2005). "Critical Notice: Cycles of Contingency – Developmental Systems and Evolution". <em>Biology & Philosophy</em>. <strong>20</strong> (2–3): 517–44. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1007%2Fs10539-004-0836-4" rel="nofollow">10.1007/s10539-004-0836-4</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-85" title="Jump up">^</a></strong> Chapter: "Nervous System Development" in "Epigenetics," by Benedikt Hallgrimsson and Brian Hall</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid17194589_86-0" title="Jump up">^</a></strong> <cite>Costa S, Shaw P (March 2007). <a href="https://web.archive.org/web/20131215042638/http://cromatina.icb.ufmg.br/biomol/seminarios/outros/grupo_open.pdf" rel="nofollow">"'Open minded' cells: how cells can change fate"</a> (PDF). <em>Trends Cell Biol</em>. <strong>17</strong> (3): 101–06. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2Fj.tcb.2006.12.005" rel="nofollow">10.1016/j.tcb.2006.12.005</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17194589" rel="nofollow">17194589</a>. Archived from <a href="http://cromatina.icb.ufmg.br/biomol/seminarios/outros/grupo_open.pdf" rel="nofollow">the original</a> (PDF) on 15 December 2013. <q>This might suggest that plant cells do not use or require a cellular memory mechanism and just respond to positional information. However, it has been shown that plants do use cellular memory mechanisms mediated by PcG proteins in several processes, ... (p. 104)</q></cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid12163699_87-0" title="Jump up">^</a></strong> <cite>Cooney CA, Dave AA, Wolff GL (August 2002). "Maternal methyl supplements in mice affect epigenetic variation and DNA methylation of offspring". <em>J. Nutr</em>. <strong>132</strong> (8 Suppl): 2393S–400S. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/12163699" rel="nofollow">12163699</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-waterland_88-0" title="Jump up">^</a></strong> <cite>Waterland RA, Jirtle RL (August 2003). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC165709" rel="nofollow">"Transposable elements: targets for early nutritional effects on epigenetic gene regulation"</a>. <em>Mol. Cell. Biol</em>. <strong>23</strong> (15): 5293–300. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1128%2FMCB.23.15.5293-5300.2003" rel="nofollow">10.1128/MCB.23.15.5293-5300.2003</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC165709" rel="nofollow">165709</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/12861015" rel="nofollow">12861015</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-89" title="Jump up">^</a></strong> <a href="http://www.scientificamerican.com/article.cfm?id=fearful-memories-passed-down&print=true" rel="nofollow">Fearful Memories Passed Down to Mouse Descendants: Genetic imprint from traumatic experiences carries through at least two generations</a>, By Ewen Callaway and Nature magazine | Sunday, 1 December 2013.</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-90" title="Jump up">^</a></strong> <a href="http://medicalxpress.com/news/2013-12-mice-sons-grandsons-dangers-sperm.html#ajTabs" rel="nofollow">Mice can 'warn' sons, grandsons of dangers via sperm</a>, by Mariette Le Roux, 12/1/13.</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-91" title="Jump up">^</a></strong> G. Francis, "Too Much Success for Recent Groundbreaking Epigenetic Experiments" <a href="http://www.genetics.org/content/198/2/449.abstract" rel="nofollow">http://www.genetics.org/content/198/2/449.abstract</a></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-92" title="Jump up">^</a></strong> <cite>Dias BG, Ressler KJ (2014). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3923835" rel="nofollow">"Parental olfactory experience influences behavior and neural structure in subsequent generations"</a>. <em>Nat. Neurosci</em>. <strong>17</strong>: 89–96. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fnn.3594" rel="nofollow">10.1038/nn.3594</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3923835" rel="nofollow">3923835</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/24292232" rel="nofollow">24292232</a>.</cite> (see comment by Gonzalo Otazu)</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-93" title="Jump up">^</a></strong> <a href="http://www.the-scientist.com/?articles.view/articleNo/41239/title/Epigenetics-Paper-Raises-Questions/" rel="nofollow">http://www.the-scientist.com/?articles.view/articleNo/41239/title/Epigenetics-Paper-Raises-Questions/</a><sup>[<em><a href="https://en.wikipedia.org/wiki/Wikipedia:Citing_sources#What_information_to_include" title="Wikipedia:Citing sources">full citation needed</a></em>]</sup></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-isbn0-19-854968-7_94-0" title="Jump up">^</a></strong> <cite>Hoekstra RF (2000). <em>Evolution: an introduction</em>. Oxford [Oxfordshire]: Oxford University Press. p. 285. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/0-19-854968-7" title="Special:BookSources/0-19-854968-7">0-19-854968-7</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-isbn0-262-10107-6_95-0" title="Jump up">^</a></strong> <cite>Lamb MJ, Jablonka E (2005). <em>Evolution in four dimensions: genetic, epigenetic, behavioral, and symbolic variation in the history of life</em>. Cambridge, Massachusetts: MIT Press. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/0-262-10107-6" title="Special:BookSources/0-262-10107-6">0-262-10107-6</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-96" title="Jump up">^</a></strong> See also <a href="https://en.wikipedia.org/wiki/Denis_Noble" title="Denis Noble">Denis Noble</a> <em>The Music of Life</em> see esp pp. 93–98 and p. 48 where he cites Jablonka & Lamb and <a href="https://en.wikipedia.org/wiki/Massimo_Pigliucci" title="Massimo Pigliucci">Massimo Pigliucci</a>'s review of Jablonka and Lamb in <a href="https://en.wikipedia.org/wiki/Nature_(journal)" title="Nature (journal)">Nature</a> <strong>435</strong>, 565–566 (2 June 2005)</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-97" title="Jump up">^</a></strong> <cite>Danchin É, Charmantier A, Champagne FA, Mesoudi A, Pujol B, Blanchet S (2011). <a href="http://www.nature.com/nrg/journal/v12/n7/full/nrg3028.html" rel="nofollow">"Beyond DNA: integrating inclusive inheritance into an extended theory of evolution"</a>. <em>Nature Reviews Genetics</em>. <strong>12</strong>: 475–86. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fnrg3028" rel="nofollow">10.1038/nrg3028</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/21681209" rel="nofollow">21681209</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-98" title="Jump up">^</a></strong> <cite>Maynard Smith J (1990). "Models of a Dual Inheritance System". <em>Journal of Theoretical Biology</em>. <strong>143</strong> (1): 41–53. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2FS0022-5193%2805%2980287-5" rel="nofollow">10.1016/S0022-5193(05)80287-5</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/2359317" rel="nofollow">2359317</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-99" title="Jump up">^</a></strong> <cite>Lynch M (2007). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1876435" rel="nofollow">"The frailty of adaptive hypotheses for the origins of organismal complexity"</a>. <em>PNAS</em>. <strong>104</strong> (suppl. 1): 8597–604. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/2007PNAS..104.8597L" rel="nofollow">2007PNAS..104.8597L</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1073%2Fpnas.0702207104" rel="nofollow">10.1073/pnas.0702207104</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1876435" rel="nofollow">1876435</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17494740" rel="nofollow">17494740</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-100" title="Jump up">^</a></strong> <cite>Dickins, Thomas E.; Rahman, Qazi (2012). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3385474" rel="nofollow">"The extended evolutionary synthesis and the role of soft inheritance in evolution"</a>. <em>Proceedings of the Royal Society B: Biological Sciences</em>. <strong>279</strong> (1740): 2913–21. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1098%2Frspb.2012.0273" rel="nofollow">10.1098/rspb.2012.0273</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3385474" rel="nofollow">3385474</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/22593110" rel="nofollow">22593110</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-rando_and_verstrepen_101-0" title="Jump up">^</a></strong> <cite>Rando OJ, Verstrepen KJ (February 2007). "Timescales of genetic and epigenetic inheritance". <em>Cell</em>. <strong>128</strong> (4): 655–68. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2Fj.cell.2007.01.023" rel="nofollow">10.1016/j.cell.2007.01.023</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17320504" rel="nofollow">17320504</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-102" title="Jump up">^</a></strong> <cite>Lancaster AK, Masel J (1 September 2009). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2770902" rel="nofollow">"The evolution of reversible switches in the presence of irreversible mimics"</a>. <em>Evolution</em>. <strong>63</strong> (9): 2350–62. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1111%2Fj.1558-5646.2009.00729.x" rel="nofollow">10.1111/j.1558-5646.2009.00729.x</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2770902" rel="nofollow">2770902</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19486147" rel="nofollow">19486147</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-van_der_Graaf_et_al_103-0" title="Jump up">^</a></strong> <cite>van der Graaf, Adriaan; Wardenaar, René; Neumann, Drexel A.; Taudt, Aaron; Shaw, Ruth G.; Jansen, Ritsert C.; Schmitz, Robert J.; Colomé-Tatché, Maria; Johannes, Frank (2015). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4450394" rel="nofollow">"Rate, spectrum, and evolutionary dynamics of spontaneous epimutations"</a>. <em>Proceedings of the National Academy of Sciences</em>. <strong>112</strong> (21): 6676–81. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/2015PNAS..112.6676V" rel="nofollow">2015PNAS..112.6676V</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1073%2Fpnas.1424254112" rel="nofollow">10.1073/pnas.1424254112</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4450394" rel="nofollow">4450394</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/25964364" rel="nofollow">25964364</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-104" title="Jump up">^</a></strong> <cite>Úbeda, Francisco; Griswold, Cortland K.; Masel, Joanna (2009). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2686163" rel="nofollow">"Complex Adaptations Can Drive the Evolution of the Capacitor [PSI+], Even with Realistic Rates of Yeast Sex"</a>. <em>PLoS Genetics</em>. <strong>5</strong>(6): e1000517. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1371%2Fjournal.pgen.1000517" rel="nofollow">10.1371/journal.pgen.1000517</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2686163" rel="nofollow">2686163</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19521499" rel="nofollow">19521499</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Jablonka09_105-0" title="Jump up">^</a></strong> <cite>Jablonka E, Raz G (June 2009). <a href="http://compgen.unc.edu/wiki/images/d/df/JablonkaQtrRevBio2009.pdf" rel="nofollow">"Transgenerational epigenetic inheritance: prevalence, mechanisms, and implications for the study of heredity and evolution"</a> (PDF). <em>Q Rev Biol</em>. <strong>84</strong> (2): 131–76. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1086%2F598822" rel="nofollow">10.1086/598822</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19606595" rel="nofollow">19606595</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-106" title="Jump up">^</a></strong> Davies, Hazel (2008). Do Butterflies Bite?: Fascinating Answers to Questions about Butterflies and Moths (Animals Q&A). Rutgers University Press.</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid19092133_107-0" title="Jump up">^</a></strong> <cite>Lewis ZA, Honda S, Khlafallah TK, Jeffress JK, Freitag M, Mohn F, Schübeler D, Selker EU (March 2009). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2661801" rel="nofollow">"Relics of repeat-induced point mutation direct heterochromatin formation in Neurospora crassa"</a>. <em>Genome Res</em>. <strong>19</strong> (3): 427–37. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1101%2Fgr.086231.108" rel="nofollow">10.1101/gr.086231.108</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2661801" rel="nofollow">2661801</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19092133" rel="nofollow">19092133</a>.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-JorgTost_108-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-JorgTost_108-1"><sup><em><strong>b</strong></em></sup></a> <cite>Jorg Tost (2008). <em>Epigenetics</em>. Norfolk, England: Caister Academic Press. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/1-904455-23-9" title="Special:BookSources/1-904455-23-9">1-904455-23-9</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-109" title="Jump up">^</a></strong> <cite>Schadt EE, Banerjee O, Fang G, Feng Z, Wong WH, Zhang X, Kislyuk A, Clark TA, Luong K, Keren-Paz A, Chess A, Kumar V, Chen-Plotkin A, Sondheimer N, Korlach J, Kasarskis A (2012). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3530673" rel="nofollow">"Modeling kinetic rate variation in third generation DNA sequencing data to detect putative modifications to DNA bases"</a>. <em>Genome Research</em>. <strong>23</strong> (1): 129–41. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1101%2Fgr.136739.111" rel="nofollow">10.1101/gr.136739.111</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3530673" rel="nofollow">3530673</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/23093720" rel="nofollow">23093720</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-110" title="Jump up">^</a></strong> <cite>Davis BM, Chao MC, Waldor MK (2013). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3646917" rel="nofollow">"Entering the era of bacterial epigenomics with single molecule real time DNA sequencing"</a>. <em>Current Opinion in Microbiology</em>. <strong>16</strong> (2): 192–98. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2Fj.mib.2013.01.011" rel="nofollow">10.1016/j.mib.2013.01.011</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3646917" rel="nofollow">3646917</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/23434113" rel="nofollow">23434113</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-111" title="Jump up">^</a></strong> <cite>Lluch-Senar M, Luong K, Lloréns-Rico V, Delgado J, Fang G, Spittle K, Clark TA, Schadt E, Turner SW, Korlach J, Serrano L (2013). Richardson PM, ed. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3536716" rel="nofollow">"Comprehensive Methylome Characterization of Mycoplasma genitalium and Mycoplasma pneumoniae at Single-Base Resolution"</a>. <em>PLoS Genetics</em>. <strong>9</strong> (1): e1003191. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1371%2Fjournal.pgen.1003191" rel="nofollow">10.1371/journal.pgen.1003191</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3536716" rel="nofollow">3536716</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/23300489" rel="nofollow">23300489</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-112" title="Jump up">^</a></strong> <cite>Murray IA, Clark TA, Morgan RD, Boitano M, Anton BP, Luong K, Fomenkov A, Turner SW, Korlach J, Roberts RJ (2012). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3526280" rel="nofollow">"The methylomes of six bacteria"</a>. <em>Nucleic Acids Research</em>. <strong>40</strong> (22): 11450–62. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1093%2Fnar%2Fgks891" rel="nofollow">10.1093/nar/gks891</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3526280" rel="nofollow">3526280</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/23034806" rel="nofollow">23034806</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-113" title="Jump up">^</a></strong> <cite>Fang G, Munera D, Friedman DI, Mandlik A, Chao MC, Banerjee O, Feng Z, Losic B, Mahajan MC, Jabado OJ, Deikus G, Clark TA, Luong K, Murray IA, Davis BM, Keren-Paz A, Chess A, Roberts RJ, Korlach J, Turner SW, Kumar V, Waldor MK, Schadt EE (2012). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3879109" rel="nofollow">"Genome-wide mapping of methylated adenine residues in pathogenic Escherichia coli using single-molecule real-time sequencing"</a>. <em>Nature Biotechnology</em>. <strong>30</strong> (12): 1232–39. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fnbt.2432" rel="nofollow">10.1038/nbt.2432</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3879109" rel="nofollow">3879109</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/23138224" rel="nofollow">23138224</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Casadesus_114-0" title="Jump up">^</a></strong> <cite>Casadesús J, Low D (September 2006). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1594586" rel="nofollow">"Epigenetic gene regulation in the bacterial world"</a>. <em>Microbiol. 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Archived from <a href="http://www.curetoday.com/index.cfm/fuseaction/article.show/id/2/article_id/949" rel="nofollow">the original</a> on 29 May 2009.</cite></li> <li>^ <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid16009939_118-0">Jump up to:<sup><em><strong>a</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid16009939_118-1"><sup><em><strong>b</strong></em></sup></a> <a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid16009939_118-2"><sup><em><strong>c</strong></em></sup></a> <cite>Fraga MF, Ballestar E, Paz MF, Ropero S, Setien F, Ballestar ML, Heine-Suñer D, Cigudosa JC, Urioste M, Benitez J, Boix-Chornet M, Sanchez-Aguilera A, Ling C, Carlsson E, Poulsen P, Vaag A, Stephan Z, Spector TD, Wu YZ, Plass C, Esteller M (July 2005). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1174919" rel="nofollow">"Epigenetic differences arise during the lifetime of monozygotic twins"</a>. <em>Proc. Natl. Acad. Sci. 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"DNA methylation profiles in monozygotic and dizygotic twins". <em>Nat. Genet</em>. <strong>41</strong> (2): 240–45. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fng.286" rel="nofollow">10.1038/ng.286</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19151718" rel="nofollow">19151718</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-120" title="Jump up">^</a></strong> <cite>O'Connor, Anahad (11 March 2008). <a href="https://www.nytimes.com/2008/03/11/health/11real.html" rel="nofollow">"The Claim: Identical Twins Have Identical DNA"</a>. New York Times. Retrieved 2 May 2010.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid19653134_121-0" title="Jump up">^</a></strong> <cite>Ballestar E (2010). 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"Angelman and Prader-Willi syndromes share a common chromosome 15 deletion but differ in parental origin of the deletion". <em>Am. J. Med. 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"The genomic landscapes of human breast and colorectal cancers". <em>Science</em>. <strong>318</strong>(5853): 1108–13. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/2007Sci...318.1108W" rel="nofollow">2007Sci...318.1108W</a>. <a href="https://en.wikipedia.org/wiki/CiteSeerX" title="CiteSeerX">CiteSeerX</a> <a href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.218.5477" rel="nofollow">10.1.1.218.5477</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1126%2Fscience.1145720" rel="nofollow">10.1126/science.1145720</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/17932254" rel="nofollow">17932254</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-131" title="Jump up">^</a></strong> <cite>Jasperson KW, Tuohy TM, Neklason DW, Burt RW (2010). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3057468" rel="nofollow">"Hereditary and familial colon cancer"</a>. <em>Gastroenterology</em>. <strong>138</strong>(6): 2044–58. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1053%2Fj.gastro.2010.01.054" rel="nofollow">10.1053/j.gastro.2010.01.054</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3057468" rel="nofollow">3057468</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/20420945" rel="nofollow">20420945</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Novak_132-0" title="Jump up">^</a></strong> <cite>Novak, Kris (20 December 2004). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1480584" rel="nofollow">"Epigenetics Changes in Cancer Cells"</a>. <em>Medscape General Medicine</em>. <strong>6</strong> (4): 17. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1480584" rel="nofollow">1480584</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/15775844" rel="nofollow">15775844</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid22735547_133-0" title="Jump up">^</a></strong> <cite>Banno K, Kisu I, Yanokura M, Tsuji K, Masuda K, Ueki A, Kobayashi Y, Yamagami W, Nomura H, Tominaga E, Susumu N, Aoki D (2012). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3582986" rel="nofollow">"Epimutation and cancer: a new carcinogenic mechanism of Lynch syndrome (Review)"</a>. <em>Int. 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Journal of diabetes and its complications. 2018 Feb 7.</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-ReferenceA_135-0" title="Jump up">^</a></strong> <cite>Caspi, A. (18 July 2003). "Influence of Life Stress on Depression: Moderation by a Polymorphism in the 5-HTT Gene". <em>Science</em>. <strong>301</strong>(5631): 386–89. <a href="https://en.wikipedia.org/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a href="http://adsabs.harvard.edu/abs/2003Sci...301..386C" rel="nofollow">2003Sci...301..386C</a>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1126%2Fscience.1083968" rel="nofollow">10.1126/science.1083968</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/12869766" rel="nofollow">12869766</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-ReferenceB_136-0" title="Jump up">^</a></strong> <cite><em>Persistence of Early-Life Stress on the Epigenome: Nonhuman Primate Observations</em>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2FB978-0-12-809324-5.02862-5" rel="nofollow">10.1016/B978-0-12-809324-5.02862-5</a>. <a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="https://en.wikipedia.org/wiki/Special:BookSources/978-0-12-809324-5" title="Special:BookSources/978-0-12-809324-5">978-0-12-809324-5</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Nestler_137-0" title="Jump up">^</a></strong> <cite>Robison AJ, Nestler EJ (November 2011). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3272277" rel="nofollow">"Transcriptional and epigenetic mechanisms of addiction"</a>. <em>Nat. Rev. Neurosci</em>. <strong>12</strong>(11): 623–37. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1038%2Fnrn3111" rel="nofollow">10.1038/nrn3111</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3272277" rel="nofollow">3272277</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/21989194" rel="nofollow">21989194</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-Cellular_basis_138-0" title="Jump up">^</a></strong> <cite>Nestler EJ (December 2013). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3898681" rel="nofollow">"Cellular basis of memory for addiction"</a>. <em>Dialogues Clin. Neurosci</em>. <strong>15</strong> (4): 431–43. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3898681" rel="nofollow">3898681</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/24459410" rel="nofollow">24459410</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-What_the_%CE%94FosB?_139-0" title="Jump up">^</a></strong> <cite>Ruffle JK (November 2014). "Molecular neurobiology of addiction: what's all the (Δ)FosB about?". <em>Am J Drug Alcohol Abuse</em>. <strong>40</strong> (6): 428–37. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.3109%2F00952990.2014.933840" rel="nofollow">10.3109/00952990.2014.933840</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/25083822" rel="nofollow">25083822</a>. <q>Conclusions<br /> ΔFosB is an essential transcription factor implicated in the molecular and behavioral pathways of addiction following repeated drug exposure. The formation of ΔFosB in multiple brain regions, and the molecular pathway leading to the formation of AP-1 complexes is well understood. The establishment of a functional purpose for ΔFosB has allowed further determination as to some of the key aspects of its molecular cascades, involving effectors such as GluR2 (87,88), Cdk5 (93) and NFkB (100). Moreover, many of these molecular changes identified are now directly linked to the structural, physiological and behavioral changes observed following chronic drug exposure (60,95,97,102). New frontiers of research investigating the molecular roles of ΔFosB have been opened by epigenetic studies, and recent advances have illustrated the role of ΔFosB acting on DNA and histones, truly as a ‘‘molecular switch’’ (34). As a consequence of our improved understanding of ΔFosB in addiction, it is possible to evaluate the addictive potential of current medications (119), as well as use it as a biomarker for assessing the efficacy of therapeutic interventions (121,122,124). Some of these proposed interventions have limitations (125) or are in their infancy (75). However, it is hoped that some of these preliminary findings may lead to innovative treatments, which are much needed in addiction.</q></cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-G9a_reverses_%CE%94FosB_plasticity_140-0" title="Jump up">^</a></strong> <cite>Biliński P, Wojtyła A, Kapka-Skrzypczak L, Chwedorowicz R, Cyranka M, Studziński T (2012). "Epigenetic regulation in drug addiction". <em>Ann. Agric. Environ. Med</em>. <strong>19</strong> (3): 491–96. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/23020045" rel="nofollow">23020045</a>. <q>For these reasons, ΔFosB is considered a primary and causative transcription factor in creating new neural connections in the reward centre, prefrontal cortex, and other regions of the limbic system. This is reflected in the increased, stable and long-lasting level of sensitivity to cocaine and other drugs, and tendency to relapse even after long periods of abstinence. These newly constructed networks function very efficiently via new pathways as soon as drugs of abuse are further taken ... In this way, the induction of CDK5 gene expression occurs together with suppression of the G9A gene coding for dimethyltransferase acting on the histone H3. A feedback mechanism can be observed in the regulation of these 2 crucial factors that determine the adaptive epigenetic response to cocaine. This depends on ΔFosB inhibiting G9a gene expression, i.e. H3K9me2 synthesis which in turn inhibits transcription factors for ΔFosB. For this reason, the observed hyper-expression of G9a, which ensures high levels of the dimethylated form of histone H3, eliminates the neuronal structural and plasticity effects caused by cocaine by means of this feedback which blocks ΔFosB transcription</q></cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid23920159_141-0" title="Jump up">^</a></strong> <cite>Vassoler FM, Sadri-Vakili G (2014). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3872494" rel="nofollow">"Mechanisms of transgenerational inheritance of addictive-like behaviors"</a>. <em>Neuroscience</em>. <strong>264</strong>: 198–206. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1016%2Fj.neuroscience.2013.07.064" rel="nofollow">10.1016/j.neuroscience.2013.07.064</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" title="PubMed Central">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3872494" rel="nofollow">3872494</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/23920159" rel="nofollow">23920159</a>.</cite></li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-pmid26572641_142-0" title="Jump up">^</a></strong> <cite>Yuan TF, Li A, Sun X, Ouyang H, Campos C, Rocha NB, Arias-Carrión O, Machado S, Hou G, So KF (2015). 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The Guardian.</li> <li><strong><a href="https://en.wikipedia.org/wiki/Epigenetics#cite_ref-150" title="Jump up">^</a></strong> <a href="https://www.sciencebasedmedicine.org/epigenetics-it-doesnt-mean-what-quacks-think-it-means/" rel="nofollow">"Epigenetics: It doesn’t mean what quacks think it means"</a>. Science-Based Medicine.</li></ol> <h2>External links[<a href="https://en.wikipedia.org/w/index.php?title=Epigenetics&action=edit&section=37" title="Edit section: External links">edit</a>]</h2> <table> <tbody> <tr> <td><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png" style="height:40px; width:40px" /></td> <td>Look up <em><strong><a href="https://en.wiktionary.org/wiki/Special:Search/epigenetics" title="wiktionary:Special:Search/epigenetics">epigenetics</a></strong></em> in Wiktionary, the free dictionary.</td> </tr> </tbody></table> <table> <tbody> <tr> <td><img alt="" src="https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" style="height:40px; width:30px" /></td> <td>Wikimedia Commons has media related to <em><strong><a href="https://commons.wikimedia.org/wiki/Special:Search/Epigenetics" title="commons:Special:Search/Epigenetics">Epigenetics</a></strong></em>.</td> </tr> </tbody></table> <ul> <li><cite>Haque FN, Gottesman II, Wong AH (May 2009). "Not really identical: epigenetic differences in monozygotic twins and implications for twin studies in psychiatry". <em>American Journal of Medical Genetics Part C</em>. <strong>151C</strong> (2): 136–41. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a href="https://doi.org/10.1002%2Fajmg.c.30206" rel="nofollow">10.1002/ajmg.c.30206</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Identifier" title="PubMed Identifier">PMID</a> <a href="https://www.ncbi.nlm.nih.gov/pubmed/19378334" rel="nofollow">19378334</a>.</cite></li> <li><a href="http://www.epigenome.org/" rel="nofollow">The Human Epigenome Project (HEP)</a></li> <li><a href="https://web.archive.org/web/20100503172418/http://www.epigenome-noe.net/index.php" rel="nofollow">The Epigenome Network of Excellence (NoE)</a></li> <li><a href="http://www.epigenomes.ca/" rel="nofollow">Canadian Epigenetics, Environment and Health Research Consortium (CEEHRC)</a></li> <li><a href="http://www.epigenome.eu/" rel="nofollow">The Epigenome Network of Excellence (NoE) – public international site</a></li> <li><a href="http://discovermagazine.com/2006/nov/cover" rel="nofollow">DNA Is Not Destiny</a> – <em>Discover</em> Magazine cover story</li> <li><a href="http://www.bbc.co.uk/sn/tvradio/programmes/horizon/ghostgenes.shtml" rel="nofollow">BBC – <em>Horizon</em> – 2005 – The Ghost In Your Genes</a></li> <li><a href="https://web.archive.org/web/20080509124439/http://www.hopkinsmedicine.org/press/2002/November/epigenetics.htm" rel="nofollow">Epigenetics article</a> at Hopkins Medicine</li> <li><a href="https://web.archive.org/web/20110721032750/http://genome.wellcome.ac.uk/doc_WTX036556.html" rel="nofollow">Towards a global map of epigenetic variation</a></li></ul>