The ERCC1/XPF endonuclease is required for completion of homologous recombination at DNA replication forks stalled by inter-strand cross-links.

The ERCC1/XPF endonuclease is required for completion of homologous recombination at DNA replication forks stalled by inter-strand cross-links.
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DOI:
10.1093/nar/gkp705
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发表时间:
2009-10
影响因子:
14.9
通讯作者:
Helleday T
Helleday T
中科院分区:
生物学2区
文献类型:
--
作者:
Al-Minawi AZ;Lee YF;Håkansson D;Johansson F;Lundin C;Saleh-Gohari N;Schultz N;Jenssen D;Bryant HE;Meuth M;Hinz JM;Helleday T

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ERCC1-XPF 复合物和参与同源重组 (HR) 的蛋白质在链间交联 (ICL) 修复中都具有关键作用。在这里,我们报告丝裂霉素 C 诱导的损伤抑制复制叉伸长。此外,丝裂霉素 C 诱导的 DNA 双链断裂 (DSB) 是 ICL 停滞复制叉崩溃的结果。这些不是通过复制流失形成的,因为我们表明丝裂霉素 C 或顺铂诱导的 DNA 损伤不会被全基因组核苷酸切除修复 (GGR) 切割。我们还建议 ICL 损伤修复是通过复制或转录启动的,因为 GGR 不会切割 ICL 损伤。此外,我们报告说,RAD51 灶是由顺铂或丝裂霉素 C 独立于 ERCC1 诱导的,但在报告构建体中测量的丝裂霉素 C 诱导的 HR 在 ERCC1 缺陷细胞中受损。这些数据表明 ERCC1-XPF 在 ICL 修复中 HR 的完成中发挥作用。我们还发现,通过 siRNA 共耗竭 XRCC3 和 ERCC1,对顺铂没有额外的敏感性,这表明这两种蛋白作用于相同的途径以促进存活。
Both the ERCC1-XPF complex and the proteins involved in homoIogous recombination (HR) have critical roles in inter-strand cross-link (ICL) repair. Here, we report that mitomycin C-induced lesions inhibit replication fork elongation. Furthermore, mitomycin C-induced DNA double-strand breaks (DSBs) are the result of the collapse of ICL-stalled replication forks. These are not formed through replication run off, as we show that mitomycin C or cisplatin-induced DNA lesions are not incised by global genome nucleotide excision repair (GGR). We also suggest that ICL-lesion repair is initiated either by replication or transcription, as the GGR does not incise ICL-lesions. Furthermore, we report that RAD51 foci are induced by cisplatin or mitomycin C independently of ERCC1, but that mitomycin C-induced HR measured in a reporter construct is impaired in ERCC1-defective cells. These data suggest that ERCC1–XPF plays a role in completion of HR in ICL repair. We also find no additional sensitivity to cisplatin by siRNA co-depletion of XRCC3 and ERCC1, showing that the two proteins act on the same pathway to promote survival.
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