A genome-wide homologous recombination screen identifies the RNA-binding protein RBMX as a component of the DNA-damage response.

A genome-wide homologous recombination screen identifies the RNA-binding protein RBMX as a component of the DNA-damage response.
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DOI:
10.1038/ncb2426
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发表时间:
2012-02-19
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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--
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DNA双链断裂的修复对基因组稳定和预防发育障碍和癌症至关重要。这种修复的主要途径是同源重组(HR)。大多数关于HR的知识来源于对原核生物和真核生物模式生物的研究。我们在人类细胞中进行了全基因组sirna筛选。在HR的正调节因子中,我们确定了DNA损伤反应和mrna前加工蛋白网络,在负调节因子中,我们确定了磷酸酶网络。三种定位于DNA损伤的候选蛋白包括RBMX,一种异质核核糖核蛋白,在选择性剪接中起作用。RBMX以多聚(adp -核糖)聚合酶1依赖的方式在DNA损伤处通过多个结构域积累,并通过促进BRCA2的适当表达来促进HR。我们的筛选还显示,Rad51的脱靶缺失是RNAi假阳性的常见来源,这为siRNA筛选和基于RNAi的HR研究敲响了警钟。
Repair of DNA double strand breaks is critical to genomic stability and the prevention of developmental disorders and cancer. A central pathway for this repair is homologous recombination (HR). Most knowledge of HR is derived from work in prokaryotic and eukaryotic model organisms. We performed a genome-wide siRNA-based screen in human cells. Among positive regulators of HR we identified networks of DNA damage response and pre-mRNA processing proteins, and among negative regulators we identified a phosphatase network. Three candidate proteins localized to DNA lesions including RBMX, a heterogeneous nuclear ribonucleoprotein that has a role in alternative splicing. RBMX accumulated at DNA lesions via multiple domains in a poly(ADP-ribose) polymerase 1-dependent manner and promoted HR by facilitating proper BRCA2 expression. Our screen also revealed that off-target depletion of Rad51 is a common source of RNAi false-positives, sounding a cautionary note for siRNA screens and RNAi-based studies of HR.
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