Reciprocal intronic and exonic histone modification regions in humans.

Reciprocal intronic and exonic histone modification regions in humans.
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人类中的相互内含子和外显子组蛋白修饰区。

DOI:
10.1038/nsmb.1924
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发表时间:
2010-12
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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虽然许多注意力集中在启动子和外显子的染色质上,但人类基因大多由内含子序列组成。通过分析已发表的人类核小体和41种染色质标记的研究,我们鉴定了与5′内含子序列特异性相关的组蛋白修饰,可与启动子标记和大量核小体区分开来。这些内含子标记在空间上与H3K36me3相互作用,通常在内部外显子附近过渡。几个标记在真正的外显子附近转换,但不在外显子样序列的核小体附近转换。因此,我们询问剪接在组蛋白标记中的作用。尽管受调控的选择性剪接发生了巨大变化,但组蛋白标记是稳定的。值得注意的是,这些发现与外显子定义在影响组蛋白标记中的作用一致。总之,我们证明了许多基因内标记在人类中的位置可以提炼成一个简单的组织原则:与5′内含子或3′外显子区域的关联。
While much attention has been focused on chromatin at promoters and exons, human genes are mostly composed of intronic sequences. Analyzing published surveys of nucleosomes and 41 chromatin marks in humans, we identified histone modifications specifically associated with 5′ intronic sequences, distinguishable from promoter marks and bulk nucleosomes. These intronic marks were spatially reciprocal to H3K36me3, typically transitioning near internal exons. Several marks transitioned near bona fide exons, but not near nucleosomes at exon-like sequences. Thus, we interrogated splicing for a role in histone marking. Despite dramatic changes in regulated alternative splicing, histone marks were stable. Notably, these findings are consistent with a role for exon definition in influencing histone marks. In summary, we demonstrate that the location of many intragenic marks in humans can be distilled into a simple organizing principle: association with 5′ intronic or 3′ exonic regions.
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