Nucleotide excision repair-induced H2A ubiquitination is dependent on MDC1 and RNF8 and reveals a universal DNA damage response.

Nucleotide excision repair-induced H2A ubiquitination is dependent on MDC1 and RNF8 and reveals a universal DNA damage response.
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DOI:
10.1083/jcb.200902150
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发表时间:
2009-09-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Vermeulen W
Vermeulen W
中科院分区:
其他
文献类型:
--
作者:
Marteijn JA;Bekker-Jensen S;Mailand N;Lans H;Schwertman P;Gourdin AM;Dantuma NP;Lukas J;Vermeulen W

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指示DNA UV损伤或双链断裂的表观遗传标记通过共同途径实现,而不管损伤的原因。染色质修饰是DNA损伤反应(DDR)网络的一个重要组成部分,保护基因组的完整性。最近,我们证明了核苷酸切除修复(NER)依赖组蛋白H2 A泛素化的紫外线(UV)诱导的DNA损伤的网站。在这项研究中,我们显示了一个持续的H2 A泛素化在受损的DNA,这需要动态泛素化的Ubc 13和RNF 8。这些酶的消耗导致UV超敏性而不影响NER,这表明Ubc 13和RNF 8在下游UV-DDR中的功能。RNF 8通过与双链断裂(DSB)-DDR支架蛋白MDC 1相互作用靶向受损的DNA,为MDC 1建立了新的功能。RNF 8以细胞周期独立的方式被募集到UV损伤的位点,这需要NER产生的单链修复中间体和共济失调毛细血管扩张症突变的和Rad 3相关的蛋白。我们的研究结果揭示了一个保守的DNA损伤诱导的H2 A泛素化的DSB和紫外线损伤,包括招聘53 BP 1和Brca 1的途径。虽然这两种损伤都是通过独立的修复途径处理的,并通过不同的激酶触发信号反应,但它们最终会产生相同的表观遗传标记,可能在DNA损伤信号放大中起作用。
The epigenetic mark indicative of DNA UV damage or double-strand breaks is achieved via a common pathway regardless of the cause of damage. Chromatin modifications are an important component of the of DNA damage response (DDR) network that safeguard genomic integrity. Recently, we demonstrated nucleotide excision repair (NER)–dependent histone H2A ubiquitination at sites of ultraviolet (UV)-induced DNA damage. In this study, we show a sustained H2A ubiquitination at damaged DNA, which requires dynamic ubiquitination by Ubc13 and RNF8. Depletion of these enzymes causes UV hypersensitivity without affecting NER, which is indicative of a function for Ubc13 and RNF8 in the downstream UV–DDR. RNF8 is targeted to damaged DNA through an interaction with the double-strand break (DSB)–DDR scaffold protein MDC1, establishing a novel function for MDC1. RNF8 is recruited to sites of UV damage in a cell cycle–independent fashion that requires NER-generated, single-stranded repair intermediates and ataxia telangiectasia–mutated and Rad3-related protein. Our results reveal a conserved pathway of DNA damage–induced H2A ubiquitination for both DSBs and UV lesions, including the recruitment of 53BP1 and Brca1. Although both lesions are processed by independent repair pathways and trigger signaling responses by distinct kinases, they eventually generate the same epigenetic mark, possibly functioning in DNA damage signal amplification.
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