Regulation of DNA end joining, resection, and immunoglobulin class switch recombination by 53BP1.

Regulation of DNA end joining, resection, and immunoglobulin class switch recombination by 53BP1.
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DOI:
10.1016/j.molcel.2011.03.019
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发表时间:
2011-05-06
期刊:
影响因子:
16
通讯作者:
Nussenzweig MC
Nussenzweig MC
中科院分区:
生物学1区
文献类型:
--
作者:
Bothmer A;Robbiani DF;Di Virgilio M;Bunting SF;Klein IA;Feldhahn N;Barlow J;Chen HT;Bosque D;Callen E;Nussenzweig A;Nussenzweig MC

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53 BP 1是一种DNA损伤蛋白,其在DNA双链断裂(DSB)周围的1 Mb区域中形成磷酸化H2 AX(γ-H2 AX)依赖性灶。此外,53 BP 1通过调节DNA末端的代谢来促进基因组稳定性。我们比较了在存在或不存在53 BP 1的情况下12号染色体上间隔1.2 kb至27 Mb的成对DSB的连接率。53 BP 1促进染色体内DSB的连接,但仅在对应于γ-H2 AX扩散的距离处。相反,53 BP 1对DNA末端的保护作用与距离无关。此外,53 BP 1突变体的分析表明,染色质缔合,寡聚化,和N-末端ATM磷酸化都需要DNA末端保护和加入免疫球蛋白类转换重组测量。这些数据阐明了53 BP 1维持基因组稳定性所需的分子事件,并指出了53 BP 1和H2 AX合作抑制DSB切除的模型。
53BP1 is a DNA damage protein that forms phosphorylated H2AX (γ-H2AX) dependent foci in a 1 Mb region surrounding DNA double strand breaks (DSBs). In addition, 53BP1 promotes genomic stability by regulating the metabolism of DNA ends. We have compared the joining rates of paired DSBs separated by 1.2 kb to 27 Mb on chromosome 12 in the presence or absence of 53BP1. 53BP1 facilitates joining of intrachromosomal DSBs but only at distances corresponding to γ-H2AX spreading. In contrast, DNA end protection by 53BP1 is distance independent. Furthermore, analysis of 53BP1 mutants shows that chromatin association, oligomerization, and N-terminal ATM phosphorylation are all required for DNA end protection and joining as measured by immunoglobulin class switch recombination. The data elucidate the molecular events that are required for 53BP1 to maintain genomic stability and point to a model wherein 53BP1 and H2AX cooperate to repress resection of DSBs.
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