通过RNAPII绕过阻断病变,揭示了由DNA损伤引起的新型压力
Carolina P Bañuelos1,2, Lucas D Caeiro1,2, Pradeepkumar R Cingaram1
1Sylvester Comprehensive Cancer Center, Miami, Florida 33136, USA.
Genes & development
|February 5, 2026
概括
乙转移酶p300调节了RNA聚合酶II (RNAPII) 从DNA损伤部位的去除. 损失p300允许RNAPII绕过病变,导致细胞内膜网膜应激,并使抗化疗的瘤重新敏感.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 修复DNA修复DNA的修复
背景情况:
- 基于的药物和紫外线辐射诱导DNA病变,阻断RNA聚合酶II (RNAPII).
- 这种停滞通常会激活转录合核酸切除修复 (TC-NER),RNAPII降解和全球转录关闭.
- 绕过这些DNA病变的RNAPII的细胞结果还不太清楚.
研究的目的:
- 研究乙转移酶p300在对DNA损伤的反应中的作用.
- 阐明RNAPII与受损色素相互作用的机制.
- 确定克服基于的化疗耐药性的新型治疗策略.
主要方法:
- 利用分子生物学技术研究DNA损伤中的RNAPII行为.
- 研究了p300,USP7和RNAPII在对DNA损伤的反应中的相互作用.
- 评估了p300损失对转录,翻译和细胞应激反应的影响.
主要成果:
- 通过USP7.7.识别了p300作为TC-NER-依赖的RNAPII从受损的染色质中通过USP7.7去除的关键调节器.
- 证明p300的损失允许RNAPII绕过转录阻断病变,保持转录和全长mRNA生产.
- 观察到绕过病变会导致持续的翻译,内质网膜压力和未展开的蛋白质反应激活,最终损害细胞活力.
- 表明这种应激反应使得基化疗耐药的瘤重新敏感.
结论:
- p300对于从DNA损伤部位移除RNAPII至关重要,防止转录绕行.
- 通过RNAPII绕道逃避转录关闭,会在瘤细胞中产生脆弱性.
- 抑制p300代表了一种合成致命策略,与诱导的DNA损伤相结合,以克服化学阻力.
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