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本帖最后由 细胞海洋 于 2013-8-23 10:15 编辑 9 W) t; g$ A: ^+ z
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This plot shows the dynamic methylation landscape of the human genome, where the x axis (left) corresponds to the maximal observed methylation change across 24 human cell and tissue types, y is the median total methylation and z is the density of CpG dinucleotides. The methylation of cytosine, usually at CpGs, is a common feature of epigenetic regulation of gene expression. Most cell types have relatively stable CpG dinucleotide methylation patterns and our understanding of which CpGs participate in genomic regulation is limited. Here, Meissner and colleagues analyse whole-genome bisulphite sequencing data sets across diverse human cell and tissue types and find that only about 22% of CpGs change their methylation state across these. Most of these CpGs are located at putative gene regulatory elements, particularly enhancers and transcription-factor-binding sites. In addition to further clarifying the distribution of DNA methylation, these selected regions with dynamic DNA methylation patterns could help guide more efficient genomic approaches to focus on informative regions, as well as help define regulatory elements. Cover: Bang Wong and Michael Ziller.* Q4 L1 i& T h1 h# n! L
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发表于 2013-8-23 09:38
发表于 2013-8-23 11:51
