在DNA损伤反应中,BRCA1的功能链接和ATAXIA telangiectasia基因产物在DNA损伤反应中
1Department of Molecular Medicine/Institute of Biotechnology, University of Texas Health Science Center at San Antonio, 78245, USA.
Nature
|July 26, 2000
概括
蛋白激酶ATM酸化CTIP,导致它在DNA受损后脱离BRCA1. 这种ATM-CtIP相互作用对于调节像GADD45.5这样的DNA修复基因至关重要.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 癌症研究 癌症研究
背景情况:
- BRCA1是一种瘤抑制剂,对DNA损伤反应和修复至关重要.
- Brca1的缺陷导致遗传不稳定性和细胞周期控制受损.
- 将DNA损伤信号与BRCA1功能联系在一起的精确机制仍然难以捉摸.
研究的目的:
- 为了阐明DNA损伤信号如何调节BRCA1的修复功能.
- 研究BRCA1相关蛋白在DNA损伤反应中的作用.
- 识别调节BRCA1活动的信号通路.
主要方法:
- 研究了在电离辐射后BRCA1和CtIP之间的相互作用.
- 利用基于细胞的测试来检查蛋白质酸化和解离.
- 采用位点定向突变发生法来评估CtIP酸化在特定血清残留物的功能意义.
- 分析了这些突变对BRCA1依赖基因表达的影响.
主要成果:
- 电离辐射诱导CtIP与BRCA1.1的高酸化和解离.
- 蛋白激酶ATM是CtIP酸化和随后解离所必需的.
- 在血清残留664和745的ATM酸化物CtIP.
- 这些酸化位点的突变阻止了CtIP与BRCA1的解离,并损害了GADD45基因的诱导.
结论:
- 通过ATM介导的CtIP酸化是DNA损伤后调节BRCA1功能的一个关键事件.
- 这种机制调节了BRCA1对DNA损伤反应基因的控制,例如GADD45.5.
- 这种ATM-CtIP-BRCA1通路的失调可能有助于ATM缺陷和乳腺癌易感性之间的联系.
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