A distinct replication fork protection pathway connects Fanconi anemia tumor suppressors to RAD51-BRCA1/2.

A distinct replication fork protection pathway connects Fanconi anemia tumor suppressors to RAD51-BRCA1/2.
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DOI:
10.1016/j.ccr.2012.05.015
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发表时间:
2012-07-10
期刊:
影响因子:
50.3
通讯作者:
Jasin M
Jasin M
中科院分区:
医学1区
文献类型:
--
作者:
Schlacher K;Wu H;Jasin M

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范可尼贫血(FA)患者突变的基因与DNA修复基因BRCA1和BRCA2/FANCD1相互作用,抑制肿瘤发生,但归因于它们的分子功能不能完全解释它们的所有细胞作用。在这里,我们展示了FA基因(包括FANCD2和BRCA1)在保护停滞的复制叉免受降解方面的修复独立需求。在fancd2缺陷细胞中,通过升高的RAD51水平或稳定的RAD51丝,叉保护令人惊讶地恢复。此外,fancd2介导的分叉保护具有RAD51功能的先进性,揭示了FA基因与RAD51和BRCA1/2乳腺癌抑制因子连接的一个意想不到的分叉保护途径。这些结果表明,FA、RAD51和BRCA1/2蛋白在预防基因组不稳定和抑制肿瘤发生方面具有修复无关功能的统一分子机制。
Genes mutated in patients with Fanconi anemia (FA) interact with the DNA repair genes BRCA1 and BRCA2/FANCD1 to suppress tumorigenesis, but the molecular functions ascribed to them cannot fully explain all of their cellular roles. Here, we show a repair-independent requirement for FA genes, including FANCD2, and BRCA1 in protecting stalled replication forks from degradation. Fork protection is surprisingly rescued in FANCD2-deficient cells by elevated RAD51 levels or stabilized RAD51 filaments. Moreover, FANCD2-mediated fork protection is epistatic with RAD51 functions, revealing an unanticipated fork protection pathway that connects FA genes to RAD51 and the BRCA1/2 breast cancer suppressors. Collective results imply a unified molecular mechanism for repair-independent functions of FA, RAD51, and BRCA1/2 proteins in preventing genomic instability and suppressing tumorigenesis.
DOI: 10.1056/nejmra0809889
发表时间: 2010-05-20
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