通过RNAPII绕过阻断病变损害了转录DNA损伤反应
bioRxiv : the preprint server for biology
|June 10, 2025
概括
这项研究表明,p300蛋白质可以阻止RNA聚合酶II (RNAPII) 绕过DNA损伤. 没有p300,RNAPII会转录受损的DNA,导致基因组不稳定和细胞生长减少.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 由于紫外线辐射和化疗药物的大量DNA病变,在转录过程中阻断了RNA聚合酶II (RNAPII).
- 这种机触发了DNA修复,RNAPII降解和全球转录关闭.
- 绕过DNA病变的RNAPII的后果尚未得到充分理解.
研究的目的:
- 研究乙转移酶p300在细胞对转录阻断DNA损伤的反应中的作用.
- 确定RNAPII绕过DNA病变对基因组稳定性和细胞增殖的影响.
主要方法:
- 细胞测试用于研究DNA损伤中的RNAPII行为.
- 分析蛋白相互作用的生物化学实验 (p300,USP7,RNAPII).
- 在p300缺乏细胞中评估DNA损伤,转录,基因组不稳定性和细胞增殖.
主要成果:
- p300与停滞的RNAPII相互作用,通过USP7.7促进其去除和降解.
- 在p300缺乏的细胞中,RNAPII绕过DNA损伤,使受损DNA的转录成为可能.
- 通过没有修复的病变转录导致基因组不稳定性增加和细胞增殖减少.
结论:
- p300对于解决DNA损伤中停滞的RNAPII至关重要,防止转录合修复逃避.
- 绕过DNA病变会导致受损DNA的转录,从而导致有害的细胞结果.
- 这突显了通过受损DNA阻止转录的生物学意义,以保持基因组完整性.
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