ATRX与TOP2B合作,通过G-quadruplex调节来实现复制叉稳定性和DNA损伤反应
Ying Pang1, Meng Cheng1, Jingzhe Wang1
1Department of Neurosurgery, Shanghai East Hospital, School of Medicine, Tongji University, 150 Jimo Road, Shanghai 200120, China.
Nucleic acids research
|September 24, 2025
概括
TOP2B通过ATRX解决G四重复 (G4s),防止结质瘤中的基因组不稳定性. CX-5461 干扰了这一过程,导致复制压力和DNA损伤,特别是在缺乏ATRX的瘤中.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- G四重复体 (G4s) 是非正规的DNA结构,与ATRX缺陷质瘤中的基因组不稳定性有关.
- TOP2B 在 G4 解析中的作用及其与 ATRX 的相互作用尚不清楚.
研究的目的:
- 确定TOP2B作为G4平衡的调节者.
- 研究TOP2B和ATRX在DNA复制过程中的G4分辨率中的合作作用.
- 阐明CX-5461破坏G4分辨率和诱导DNA损伤的机制.
主要方法:
- 通过分子生物学技术,研究了TOP2B在G4稳态中的作用.
- 在G4决议中审查了TOP2B和ATRX之间的功能合作.
- 分析了CX-5461对G4积累,复制应激和质瘤细胞中的DNA损伤的影响.
- 我们将CX-5461的机制与etoposide进行了比较.
主要成果:
- TOP2B被确定为G4稳态的新型调节剂,与ATRX合作,在复制过程中解决G4s.
- CX-5461破坏ATRX-TOP2B通路,导致G4积累,复制压力和DNA损伤.
- CX-5461作为TOP2B毒素,损害了G4位点的TOP2B结合,改变了复制叉的动态.
- 这些效应在ATRX缺乏的质瘤细胞中得到放大,突显了TOP2B的关键作用.
结论:
- TOP2B是G4分辨率的关键参与者,与ATRX合作保持基因组稳定性.
- 作为TOP2B毒素和G4稳定剂,CX-5461具有独特的双重功能.
- 与G4相关的复制压力是ATRX缺陷质瘤的潜在治疗标.
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