DNA interstrand cross-link repair requires replication-fork convergence.

DNA interstrand cross-link repair requires replication-fork convergence.
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DOI:
10.1038/nsmb.2956
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发表时间:
2015-03
影响因子:
16.8
通讯作者:
Walter, Johannes C.
Walter, Johannes C.
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang, Jieqiong;Dewar, James M.;Budzowska, Magda;Motnenko, Anna;Cohn, Martin A.;Walter, Johannes C.

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DNA链间交联(ICL)可防止DNA复制和转录过程中的链分离,因此具有极强的细胞毒性。在后生动物中,ICL修复的主要途径与DNA复制偶联,并需要范可尼贫血途径。在目前大多数模型中,单个DNA复制叉与ICL的碰撞足以启动修复。相比之下,我们在这里表明,在爪蟾卵提取物,两个DNA复制叉必须收敛于ICL触发修复。当只有一个分叉到达ICL时,复制性CMG解旋酶无法从停滞的分叉上卸载,并且修复被阻断。第二个叉子的到来,即使大大推迟,拯救修复。我们的结论是,ICL修复需要复制诱导的X形DNA结构周围的病变,我们推测这一要求如何有助于维持基因组的稳定性在S期。
DNA interstrand cross-links (ICLs) prevent strand separation during DNA replication and transcription and are therefore extremely cytotoxic. In metazoans, a major pathway of ICL repair is coupled to DNA replication and requires the Fanconi anemia pathway. In most current models, collision of a single DNA replication fork with an ICL is sufficient to initiate repair. In contrast, we show here that in Xenopus egg extracts, two DNA replication forks must converge on an ICL to trigger repair. When only one fork reaches the ICL, the replicative CMG helicase fails to unload from the stalled fork, and repair is blocked. Arrival of a second fork, even when substantially delayed, rescues repair. We conclude that ICL repair requires a replication-induced X-shaped DNA structure surrounding the lesion, and we speculate how this requirement helps maintain genomic stability in S phase.
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