RAD18 transmits DNA damage signalling to elicit homologous recombination repair.

RAD18 transmits DNA damage signalling to elicit homologous recombination repair.
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RAD18 传递 DNA 损伤信号以引发同源重组修复。

DOI:
10.1038/ncb1865
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发表时间:
2009-05
影响因子:
21.3
通讯作者:
Chen, Junjie
Chen, Junjie
中科院分区:
生物学1区
文献类型:
--
作者:
Huang, Jun;Huen, Michael S. Y.;Kim, Hongtae;Leung, Charles Chung Yun;Glover, J. N. Mark;Yu, Xiaochun;Chen, Junjie

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为了维持基因组稳定性,细胞通过激活控制细胞周期检查点并启动DNA修复的信号通路来响应DNA损伤。细胞周期检查点控制应该以某种方式与DNA修复过程联系起来,然而,这种协调在体内究竟是如何发生的在很大程度上是未知的。在这里,我们揭示了RAD18作为翻译损伤反应信号以协调同源重组(HR)修复的组成部分的新作用。我们发现,RAD18促进HR的方式严格依赖于其被招募到DNA断裂位点的能力,这种招募依赖于另一种E3连接酶RNF8介导的明确的DNA损伤信号通路。我们进一步证明,RAD18作为一个适配器,以促进HR通过与RAD51C的直接相互作用。总之,我们的数据揭示了RAD18是通过监测DNA损伤信号来协调HR修复的关键因素。
To maintain genome stability, cells respond to DNA damage by activating signaling pathways that govern cell cycle checkpoints and initiate DNA repair. Cell cycle checkpoint controls should somehow connect with DNA repair processes, however, exactly how such coordination occurs in vivo is largely unknown. Here we revealed a novel role of RAD18 as the integral component that translates the damage response signal to orchestrate homologous recombination (HR) repair. We show that RAD18 promotes HR in a manner strictly dependent upon its ability to be recruited to the sites of DNA breaks and this recruitment relies on a well-defined DNA damage-signaling pathway mediated by another E3 ligase RNF8. We further demonstrate that RAD18 functions as an adaptor to facilitate HR via a direct interaction with RAD51C. Together, our data uncovers RAD18 as a key factor that orchestrates HR repair via surveillance of the DNA damage signal.
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