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一个针对ALKBH介导的DNA脱基化修复的泛素依赖信号轴
Joshua R Brickner1, Jennifer M Soll1, Patrick M Lombardi2
1Department of Pathology and Immunology, Division of Laboratory and Genomic Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Nature
|November 17, 2017
概括
科学家在人体细胞中发现了一种新的DNA修复途径, 这一途径涉及激活信号协同整合体 (ASCC) 和泛素信号传递,对于修复DNA损伤和理解像X链接的三胞性瘤等疾病至关重要.
科学领域:
- 分子生物学
- 遗传学
- 生物化学
背景情况:
- DNA 修复机制对于基因组稳定性和预防突变至关重要.
- 虽然一些DNA修复途径已被很好地理解,但对化损伤的上游信号在很大程度上是未知的.
- 化化疗是一种常见的癌症治疗方法,使得DNA化修复至关重要.
研究的目的:
- 识别涉及检测和修复DNA化损伤的新信号通路.
- 阐明对化剂反应的分子机制.
- 研究激活信号联合集成体 (ASCC) 在DNA修复中的作用.
主要方法:
- 在暴露于化剂时对ASCC复合物的细胞局部化研究.
- 分析ASCC焦点与DNA损伤标志物和转录机制的关联.
- 研究ASCC2的CUE域在无处不在的识别中的作用.
- 在具有ASCC2或RNF113A突变的细胞中评估修复动力学和对化剂的敏感性.
主要成果:
- 在对化剂的反应中,ASCC复合物形成了不同的核焦点,与化核酸和RNA聚合酶II共同定位.
- 招募ASCC需要ASCC2子单元的CUE域识别K63结合的多基因.
- 失去ASCC2会损害化的修复,并增加对化剂的敏感性.
- RNF113A被确定为ASCC路径上游的E3连接酶,其在X结合性三甲基缩症患者中的突变导致ASCC焦点的缺陷和过敏性.
结论:
- 一个以前未知的依赖于ubiquitin的信号通路专门修复了DNA的化损伤.
- 这一途径涉及ASCC复合体,由RNF113A和ASCC2介导的泛素信号传递.
- 这种途径的缺陷有助于X结合的三基缩和对化剂的敏感性.
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