人类DNA拓酶I中毒导致R循环介导的基因组不稳定性,转录因子IIS减弱
Renée C Duardo1, Jessica Marinello1, Marco Russo1
1Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, via Selmi 3, 40126, Bologna, Italy.
Science advances
|May 24, 2024
概括
DNA拓酶I (Top1cc) 通过形成DNA-RNA杂交体和微核,可以导致基因组不稳定. 我们发现Top1ccs导致高转录基因的DNA双链断裂,与RNA聚合酶II积累和复制冲突有关.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 癌症研究 癌症研究
背景情况:
- DNA拓酶I (Top1cc) 的活性对DNA复制和转录至关重要.
- Top1cc中间体可以导致基因组不稳定性,包括DNA双链断裂 (DSB),DNA-RNA混合体和微核形成.
- Top1cc诱导这些基因组变化的确切机制尚未完全理解.
研究的目的:
- 阐明Top1cc诱导的DNA-RNA混合体和DSBs背后的机制.
- 研究RNA聚合酶II (RNAPII) 积累和转录复制冲突在Top1cc介导的基因组不稳定性中的作用.
- 为了确定Top1cc诱导的微核形成的细胞周期依赖性.
主要方法:
- 整合基因组数据分析Top1cc触发混合体和DSBs.
- 利用转录因子IIS突变来研究对RNAPII积累和转录延长的影响.
- 评估了细胞周期不同阶段的微核形成.
主要成果:
- Top1ccs通过不同的机制诱导DNA-RNA杂交.
- DSBs发生在早期复制区的高度转录的基因上,与基因5'-end.在积累的RNAPII下游的混合物重叠.
- 转录延长受损导致RNAPII积累增加和Top1cc诱导的DSB和微核,特别是当Top1cc在特定细胞周期阶段 (G1晚期,S早期/中期) 发生时.
结论:
- RNAPII积累和随后的转录复制冲突在Top1cc诱导的DSB和微核中发挥着重要作用.
- 转录因子IIS活动可以减轻Top1cc诱导的基因组不稳定性.
- 这些发现强调了Top1cc,转录,复制和癌细胞中的基因组完整性之间的复杂相互作用.
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