P53 modulates homologous recombination by transcriptional regulation of the RAD51 gene

P53 modulates homologous recombination by transcriptional regulation of the RAD51 gene
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DOI:
10.1038/sj.embor.7400587
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发表时间:
2006-02-01
期刊:
影响因子:
7.7
通讯作者:
Silva, A
Silva, A
中科院分区:
生物学2区
文献类型:
--
作者:
Arias-Lopez, C;Lazaro-Trueba, I;Silva, A

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通过同源重组进行的 DNA 修复参与维持基因组稳定性。先前的数据表明,野生型 p53 抑制同源重组并与 Rad51 发生物理相互作用。在这里,我们展示了野生型 p53 与 Rad51 启动子中的 p53 反应元件的体内结合,以及野生型 p53 在 DNA 损伤的情况下下调 Rad51 信使 RNA 和蛋白质。此外,野生型 p53 响应双链断裂抑制 Rad51 病灶形成,而 p53 接触突变体 R280K 无法抑制 Rad51 mRNA 和蛋白质表达以及 Rad51 病灶形成。我们认为 p53 对 Rad51 的转录抑制参与了同源重组的调节,p53 突变体对 Rad51 的抑制受损可能导致恶性转化。
DNA repair by homologous recombination is involved in maintaining genome stability. Previous data report that wild-type p53 suppresses homologous recombination and physically interacts with Rad51. Here, we show the in vivo binding of wild-type p53 to a p53 response element in the promoter of Rad51 and the downregulation of Rad51 messenger RNA and protein by wild-type p53, favoured by DNA damage. Moreover, wild-type p53 inhibits Rad51 foci formation in response to double-strand breaks, whereas p53 contact mutant R280K fails to repress Rad51 mRNA and protein expression and Rad51 foci formation. We propose that transcriptional repression of Rad51 by p53 participates in regulating homologous recombination, and impaired Rad51 repression by p53 mutants may contribute to malignant transformation.