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CtIP is required for DNA damage-dependent induction of P21

机译:DNA损伤依赖性诱导P21需要CtIP

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摘要

DNA endonuclease CtIP is involved in both DNA double-strand break (DSB) repair and transcriptional repression/ activation. The cyclin-dependent kinase inhibitor P21, which is induced at transcription level in response to a variety of stresses, controls G1/S transition. In this report, we found that CtIP bound to the P21 promoter, and this binding was enhanced in response to DNA damage. Concomitantly, ectopic expression of CtIP increased P21 promoter activity, and this increment was enhanced upon camptothecin treatment. Conversely, DNA damage failed to induce P21 gene expression in CtIP-deficient cells. Taken together, our data demonstrate that CtIP is required for DNA damage-induced P21 induction.
机译:DNA核酸内切酶CtIP参与DNA双链断裂(DSB)修复和转录抑制/激活。细胞周期蛋白依赖性激酶抑制剂P21(在转录水平上响应各种压力而诱导)可控制G1 / S过渡。在此报告中,我们发现CtIP与P21启动子结合,并且这种结合在响应DNA损伤时得到了增强。同时,CtIP的异位表达增加了P21启动子的活性,喜树碱处理后这种增加得以增强。相反,DNA损伤未能在CtIP缺陷细胞中诱导P21基因表达。两者合计,我们的数据表明CtIP是DNA损伤诱导的P21诱导所必需的。

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