Roles for NBS1 in alternative nonhomologous end-joining of V(D)J recombination intermediates.

Roles for NBS1 in alternative nonhomologous end-joining of V(D)J recombination intermediates.
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DOI:
10.1016/j.molcel.2009.03.009
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发表时间:
2009-04-10
期刊:
影响因子:
16
通讯作者:
Roth, David B.
Roth, David B.
中科院分区:
生物学1区
文献类型:
--
作者:
Deriano, Ludovic;Stracker, Travis H.;Baker, Annalee;Petrini, John H. J.;Roth, David B.

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最近的工作强调了在哺乳动物细胞中连接DNA双链断裂(DSB)的另一种容易出错的机制的重要性。这些非规范,非同源末端连接(NHEJ)途径威胁到基因组的稳定性,但仍然缺乏表征。RAG切割后复合体通常阻止V(D)J重组相关的dsb接近替代的NHEJ。由于MRE11/RAD50/NBS1复合体定位于rag介导的dsb,并具有DNA末端系固、加工和连接活性,我们想知道它是否在替代NHEJ的机制中发挥作用,或者参与调节dsb进入替代修复途径。我们发现NBS1是发夹编码端替代NHEJ所必需的,抑制信号端替代NHEJ,促进反转重组中间体的适当分解。这些数据表明,MRE11复合体在两个不同的水平上起作用,调节修复途径的选择(可能通过增强dna末端复合体的稳定性)和参与编码末端的替代NHEJ。
Recent work has highlighted the importance of alternative, error-prone mechanisms for joining DNA double-strand breaks (DSB) in mammalian cells. These noncanonical, non-homologous end joining (NHEJ) pathways threaten genomic stability but remain poorly characterized. The RAG post-cleavage complex normally prevents V(D)J recombination-associated DSBs from accessing alternative NHEJ. Because the MRE11/RAD50/NBS1 complex localizes to RAG-mediated DSBs and possesses DNA end tethering, processing and joining activities, we asked whether it plays a role in the mechanism of alternative NHEJ, or participates in regulating access of DSBs to alternative repair pathways. We find that NBS1 is required for alternative NHEJ of hairpin coding ends, suppresses alternative NHEJ of signal ends, and promotes proper resolution of inversional recombination intermediates. These data demonstrate that the MRE11 complex functions at two distinct levels, regulating repair pathway choice (likely through enhancing the stability of DNA-end complexes) and participating in alternative NHEJ of coding ends.
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