The interaction between CtIP and BRCA1 is not essential for resection-mediated DNA repair or tumor suppression.

The interaction between CtIP and BRCA1 is not essential for resection-mediated DNA repair or tumor suppression.
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DOI:
10.1083/jcb.201302145
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发表时间:
2013-05-27
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Baer R
Baer R
中科院分区:
其他
文献类型:
--
作者:
Reczek CR;Szabolcs M;Stark JM;Ludwig T;Baer R

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在哺乳动物细胞中,同源性导向的DNA修复或肿瘤抑制并不需要BRCA1和CtIP之间的磷酸化依赖相互作用。CtIP蛋白通过启动DNA切除来促进双链DNA断裂(DSB)的同源定向修复(HDR), DSB末端在这个过程中被转化为3 ' -ssDNA悬垂。BRCA1肿瘤抑制因子以磷酸化依赖的方式与CtIP相互作用,也通过HDR途径参与DSB修复。最近有报道称,BRCA1-CtIP相互作用对鸡DT40细胞的HDR至关重要。为了研究这种相互作用在哺乳动物细胞中的作用,我们产生了表达Ctip多肽(Ctip- s326a)的细胞和小鼠,这些多肽不能结合BRCA1。令人惊讶的是,Ctip-S326A突变型和野生型细胞的等基因系显示出相当水平的HDR功能和染色体稳定性。尽管Ctip-S326A突变细胞对拓扑异构酶抑制剂有一定的敏感性,但表达Ctip-S326A多肽的小鼠发育正常,没有表现出患癌症的倾向。因此,在哺乳动物中,磷酸化依赖性BRCA1-CtIP相互作用对于hdr介导的DSB修复或肿瘤抑制不是必需的。
In mammalian cells, the phospho-dependent interaction between BRCA1 and CtIP is not required for homology-directed DNA repair or tumor suppression. The CtIP protein facilitates homology-directed repair (HDR) of double-strand DNA breaks (DSBs) by initiating DNA resection, a process in which DSB ends are converted into 3′-ssDNA overhangs. The BRCA1 tumor suppressor, which interacts with CtIP in a phospho-dependent manner, has also been implicated in DSB repair through the HDR pathway. It was recently reported that the BRCA1–CtIP interaction is essential for HDR in chicken DT40 cells. To examine the role of this interaction in mammalian cells, we generated cells and mice that express Ctip polypeptides (Ctip-S326A) that fail to bind BRCA1. Surprisingly, isogenic lines of Ctip-S326A mutant and wild-type cells displayed comparable levels of HDR function and chromosomal stability. Although Ctip-S326A mutant cells were modestly sensitive to topoisomerase inhibitors, mice expressing Ctip-S326A polypeptides developed normally and did not exhibit a predisposition to cancer. Thus, in mammals, the phospho-dependent BRCA1–CtIP interaction is not essential for HDR-mediated DSB repair or for tumor suppression.
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