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
中科院分区:
文献类型:
--
作者:
Shanbhag NM;Rafalska-Metcalf IU;Balane-Bolivar C;Janicki SM;Greenberg RA
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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