ATM-dependent chromatin changes silence transcription in cis to DNA double-strand breaks.

ATM-dependent chromatin changes silence transcription in cis to DNA double-strand breaks.
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DOI:
10.1016/j.cell.2010.04.038
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发表时间:
2010-06-11
期刊:
影响因子:
64.5
通讯作者:
Greenberg RA
Greenberg RA
中科院分区:
生物学1区
文献类型:
--
作者:
Shanbhag NM;Rafalska-Metcalf IU;Balane-Bolivar C;Janicki SM;Greenberg RA

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DNA双链断裂(DSBs)引发染色质结构的广泛局部和全局改变,其中许多依赖于ATM激酶。dsb周围染色质上的组蛋白H2A泛素化(uH2A)就是一个例子,被认为对修复蛋白的募集很重要。uH2A也参与转录抑制;一个有趣但未经验证的假设是,这个函数在dsb的背景下是保守的。利用一种新颖的报告细胞,可以可视化单细胞中修复蛋白的募集和局部转录,我们描述了一个依赖于atm的转录沉默程序。ATM阻止RNA聚合酶II延伸依赖性染色质在远端dsb区域的去浓缩。沉默部分依赖于E3泛素连接酶RNF8和RNF168,而沉默的逆转依赖于uH2A去泛素化酶USP16。这些发现深入了解了翻译后修饰在染色质上发生的不同过程之间的串扰中的作用。
DNA double strand breaks (DSBs) initiate extensive local and global alterations in chromatin structure, many of which depend on the ATM kinase. Histone H2A ubiquitylation (uH2A) on chromatin surrounding DSBs is one example, thought to be important for recruitment of repair proteins. uH2A is also implicated in transcriptional repression; an intriguing yet untested hypothesis is that this function is conserved in the context of DSBs. Using a novel reporter that allows for visualization of repair protein recruitment and local transcription in single cells, we describe an ATM-dependent transcriptional silencing program in cis to DSBs. ATM prevents RNA polymerase II elongation dependent chromatin decondensation at regions distal to DSBs. Silencing is partially dependent on E3 ubiquitin ligases RNF8 and RNF168, while reversal of silencing relies on the uH2A deubiquitylating enzyme USP16. These findings give insight into the role of post-translational modifications in mediating cross talk between diverse processes occurring on chromatin.
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