Differential chromatin marking of introns and expressed exons by H3K36me3.

Differential chromatin marking of introns and expressed exons by H3K36me3.
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DOI:
10.1038/ng.322
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发表时间:
2009-03
期刊:
影响因子:
30.8
通讯作者:
Ahringer J
Ahringer J
中科院分区:
生物学1区
文献类型:
--
作者:
Kolasinska-Zwierz P;Down T;Latorre I;Liu T;Liu XS;Ahringer J

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组蛋白尾巴甲基化模式的变化反映并调节染色质的结构和功能。为了提供秀丽隐杆线虫中染色质功能的框架,我们生成了整个基因组H3尾甲基的基因组图。我们发现,秀丽隐杆线虫基因在组蛋白修饰与其他生物体的分布中表现出相似性,而H3K4me3靠近转录开始位点,基因体中的H3K36me3,H3K9Me3和H3K9me3富含无声基因。出乎意料的是,我们还观察到一个惊人的新型模式:外显子与内含子相对于内含子优先标记了H3K36ME3。 H3K36ME3外显子标记取决于转录,其剪接外显子的水平较低,支持剪接相关的标记机制。我们进一步表明,外显子和内含子之间H3K36me3标记的差异在人和小鼠中是进化保守的。我们建议染色质中的H3K36me3外显子标记提供了转录和剪接之间的动态联系。
Variation in patterns of methylations of histone tails reflects and modulates chromatin structure and function. To provide a framework for the analysis of chromatin function in C. elegans, we generated a genome-wide map of histone H3 tail methylations. We find that C. elegans genes show similarities in distributions of histone modifications to those of other organisms, with H3K4me3 near transcription start sites, H3K36me3 in the body of genes, and H3K9me3 enriched on silent genes. Unexpectedly, we also observe a striking novel pattern: exons are preferentially marked with H3K36me3 relative to introns. H3K36me3 exon marking is dependent on transcription and its level is lower in alternatively spliced exons, supporting a splicing related marking mechanism. We further show that the difference in H3K36me3 marking between exons and introns is evolutionarily conserved in human and mouse. We propose that H3K36me3 exon marking in chromatin provides a dynamic link between transcription and splicing.
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