Epigenome Regulation by Dynamic Nucleosome Unwrapping.

Epigenome Regulation by Dynamic Nucleosome Unwrapping.
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通过动态核小体解包进行表观基因组调控。

DOI:
10.1016/j.tibs.2019.09.003
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发表时间:
2020-01
影响因子:
13.8
通讯作者:
Henikoff, Steven
Henikoff, Steven
中科院分区:
生物学1区
文献类型:
--
作者:
Brahma, Sandipan;Henikoff, Steven

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真核生物中的基因调控需要序列特异性转录因子(TFs)控制进入核小体主导的染色质景观中的位点。核小体难以与TF结合,通常必须从调控区域移除。最近的基因组研究和体外测量表明,核小体对TF结合的屏障是由atp依赖性染色质重塑子控制的核小体动态解包裹调节的。亚核体中间体的全基因组占据和调控最近引起了人们的关注,应用高分辨率方法精确定位蛋白质- dna相互作用。在这里,我们总结了核小体亚结构和tf结合动力学的最新发现,并强调了未包裹的核小体中间体如何提供活性染色质的新特征。
Gene regulation in eukaryotes requires the controlled access of sequence-specific transcription factors (TFs) to their sites in a chromatin landscape dominated by nucleosomes. Nucleosomes are refractory to TF binding, and often must be removed from regulatory regions. Recent genomic studies together with in vitro measurements suggest that the nucleosome barrier to TF binding is modulated by dynamic nucleosome unwrapping governed by ATP-dependent chromatin remodelers. Genome-wide occupancy and regulation of subnucleosomal intermediates have gained recent attention with the application of high-resolution approaches for precision mapping of protein-DNA interactions. Here we summarize recent findings on nucleosome substructures and TF-binding dynamics, and highlight how unwrapped nucleosomal intermediates provide a novel signature of active chromatin.
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