转录合的AID去胺损伤取决于ELOF1相关的RNA聚合酶II
Pengfei Dai1, Yuanqing Tan2, Yifeng Luo3
1International Peace Maternity and Child Health Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Embryo Original Diseases, Shanghai 200030, China; Key Laboratory of RNA Innovation, Science and Engineering, Shanghai Academy of Natural Sciences (SANS), Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China.
转录延长因子1 (ELOF1) 稳定RNA聚合酶II,促进DNA损伤和抗体基因的修复. 缺少ELOF1会影响抗体多样化,突显其在适应性免疫中的关键作用.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 适应性免疫依赖于抗体基因多样化通过转录合损伤 (TCD) 引入激活诱导的cytidine deaminase (AID).
- 转录和DNA损伤/修复机制之间的精确协调仍然不完全理解.
研究的目的:
- 阐明转录延长因子1 (ELOF1) 在稳定RNA聚合酶II (RNAPII) 在转录障碍中的作用.
- 研究ELOF1在促进转录合DNA损伤和修复过程中的功能,特别是在抗体基因多样化的背景下.
主要方法:
- 利用遗传屏幕来识别涉及转录合DNA损伤和修复的因素.
- 采用小鼠模型来评估ELOF1缺乏对抗体类切换重组和体质突变的影响.
- 在细胞测试中研究了ELOF1,RNAPII和DNA损伤/修复因子之间的相互作用.
主要成果:
- ELOF1在转录障碍处稳定了暂停的RNAPII,为DNA损伤和修复创造了一个平台.
- ELOF1对于AID向是必不可少的,其缺乏导致缺陷的抗体类交换机重组和小鼠体质突变.
- ELOF1稳定了与染色体结合的RNAPII,在机械上促进了TCD和修复,独立于下游转录合修复因子.
- ELOF1的丧失导致暂停的RNAPII与染色质的分离,损害了DNA损伤诱导和修复的因素的招募.
结论:
- ELOF1是转录合DNA新陈代谢的中央调节者,将转录延长与DNA损伤和修复相结合.
- 在抗体基因多样化过程中,ELOF1对染色体结合RNAPII的稳定对于启动和解决DNA损伤至关重要.
- 这项研究表明RNAPII的功能转变,从转录作用转变为DNA损伤和修复过程的支架,由ELOF1.1介导.
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