The Fanconi anemia pathway promotes replication-dependent DNA interstrand cross-link repair.

The Fanconi anemia pathway promotes replication-dependent DNA interstrand cross-link repair.
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DOI:
10.1126/science.1182372
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发表时间:
2009-12-18
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Walter JC
Walter JC
中科院分区:
其他
文献类型:
--
作者:
Knipscheer P;Räschle M;Smogorzewska A;Enoiu M;Ho TV;Schärer OD;Elledge SJ;Walter JC

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范可尼贫血是一种由13个FANC基因突变引起的人类癌症易感综合征。这种疾病的特点是基因组不稳定和细胞对产生DNA链间交联(ICL)的化学物质高度敏感。Fanconi贫血途径激活的一个中心事件是FANCI-FANCD2复合体的单泛素化,但该复合体如何赋予ICL抵抗仍是一个谜。我们利用无细胞系统来证明FANCI-FANCD2复合体是复制依赖的ICL修复所必需的。从提取物中去除FANCD2会抑制ICL附近的溶核切口以及穿过病变的跨病变DNA合成。这些缺陷的逆转需要泛素化的FANCI-FANCD2。我们的结果表明,当Fanconi贫血途径受损时,基本的S期ICL修复机制的多个步骤失败。
Fanconi anemia is a human cancer predisposition syndrome caused by mutations in thirteen Fanc genes. The disorder is characterized by genomic instability and cellular hypersensitivity to chemicals that generate DNA interstrand crosslinks (ICLs). A central event in the activation of the Fanconi anemia pathway is the mono-ubiquitylation of the FANCI-FANCD2 complex, but how this complex confers ICL resistance remains enigmatic. We make use of a cell-free system to show that the FANCI-FANCD2 complex is required for replication-dependent ICL repair. Removal of FANCD2 from extracts inhibits nucleolytic incisions near the ICL as well as translesion DNA synthesis past the lesion. Reversal of these defects requires ubiquitylated FANCI-FANCD2. Our results show that multiple steps of the essential S phase ICL repair mechanism fail when the Fanconi anemia pathway is compromised.
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