AUNIP/C1orf135 directs DNA double-strand breaks towards the homologous recombination repair pathway.

AUNIP/C1orf135 directs DNA double-strand breaks towards the homologous recombination repair pathway.
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AUNIP/C1orf135 将 DNA 双链断裂引导至同源重组修复途径

DOI:
10.1038/s41467-017-01151-w
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发表时间:
2017-10-17
影响因子:
16.6
通讯作者:
Huang J
Huang J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lou J;Chen H;Han J;He H;Huen MSY;Feng XH;Liu T;Huang J

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DNA双链断裂(DSB)主要通过同源重组(HR)或非同源末端连接(NHEJ)修复。在这里,我们确定AUNIP/C1 orf 135,一个很大程度上没有特征的蛋白质,作为DSB修复途径选择的关键决定因素。AUNIP与CtIP物理相互作用,并且是在DSB有效积累CtIP所必需的。AUNIP具有固有的DNA结合能力,对模拟停滞复制叉产生的结构的DNA底物具有强烈的偏好。这种结合DNA的能力对于AUNIP及其结合伴侣CtIP向DSB的募集是必需的,这反过来又驱动CtIP依赖性DNA末端切除和HR修复。因此,AUNIP的丧失或其结合DNA的能力的消除导致细胞对各种DSB诱导剂,特别是诱导复制相关DSB的那些的超敏反应。我们的研究结果提供了新的见解的分子机制,DSB的识别和渠道的HR修复途径。
DNA double-strand breaks (DSBs) are mainly repaired by either homologous recombination (HR) or non-homologous end-joining (NHEJ). Here, we identify AUNIP/C1orf135, a largely uncharacterized protein, as a key determinant of DSB repair pathway choice. AUNIP physically interacts with CtIP and is required for efficient CtIP accumulation at DSBs. AUNIP possesses intrinsic DNA-binding ability with a strong preference for DNA substrates that mimic structures generated at stalled replication forks. This ability to bind DNA is necessary for the recruitment of AUNIP and its binding partner CtIP to DSBs, which in turn drives CtIP-dependent DNA-end resection and HR repair. Accordingly, loss of AUNIP or ablation of its ability to bind to DNA results in cell hypersensitivity toward a variety of DSB-inducing agents, particularly those that induce replication-associated DSBs. Our findings provide new insights into the molecular mechanism by which DSBs are recognized and channeled to the HR repair pathway.
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