Changes

From Biolecture.org

Minsu Kim/minsu1

1,342 bytes added, 17:01, 8 December 2017
no edit summary
<p>A&nbsp;<strong>microRNA</strong>&nbsp;(<strong>miRNA</strong>) is a small non-coding RNA&nbsp;molecule (containing about 22 nucleotides) found in plants, animals and some viruses, that functions in RNA silencing&nbsp;and post-transcriptional regulation of gene expression. miRNA are encoded in the genome as segments of longer transripts. their characteristic structure helps identify them and predict the target genes they might regulate.&nbsp;</p>
 
<p>&nbsp;</p>
 
<h1>Synthesis and Function of miRNA</h1>
 
<table align="right" cellpadding="1" cellspacing="1" style="width:300px">
<tbody>
<tr>
<td><img alt="" src="/ckfinder/userfiles/images/%EA%B7%B8%EB%A6%BC1(2).jpg" style="height:200px; width:300px" /></td>
</tr>
<tr>
<td>Structure of pre-miRNAs</td>
</tr>
<tr>
<td><img alt="" src="/ckfinder/userfiles/images/%EA%B7%B8%EB%A6%BC2(1).png" style="height:200px; width:300px" /></td>
</tr>
<tr>
<td>overview of the structure of pri-miRNA showing cleavage</td>
</tr>
</tbody>
</table>
 
<p>miRNAs are&nbsp;derived from precursor RNAs that are encoded by genes. their characteristic structure helps identify them and predict the target genes they might regulate. the functional form of a miRNA IS typically ~21 or 22 nucleotides. These short RNAs are generated by two RNA cleavage reactions from a longer RNA transcript (called a pri-RNA, &nbsp;for &quot;primary&quot;) that carries a hairpin-shaped scondary structure. The first cleavage liverates the stem- loop, called the pre-miRNA ; the second generates the mature miRNA from the pre-miRNA. The two cleavage reactions required to generate the miRNA grom these primary trnascipts are mediated by tow distinct RNases. One is <strong>Dicer</strong>, and the others is <strong>Drosha</strong></p>
 
<p>&nbsp;</p>
Anonymous user

Navigation menu