通过类酸抗意义寡核化物对DNA损伤反应的调节失调
Linn Hjelmgren1, Qianyu Zhou1, Sandro Schmidli1
1Department of Oncology and Pathology, Karolinska Institutet, Solna, Sweden.
Nature communications
|February 27, 2026
概括
反感性寡核酸 (ASOs) 可以通过与修复酶形成核凝结物来触发有害的DNA损伤反应. 这一发现揭示了ASO毒性和异常DNA修复激活的机制.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 酸 (PS) 改性反感性寡核酸 (ASOs) 用于研究和治疗中的基因表达调制.
- 由ASO播种的核结构的功能和后果仍然不清楚.
- 在DNA断裂时内源性核酸聚合物形成生物分子凝聚物,这些凝聚物招募修复蛋白质,但对酶激活的机制和影响尚不清楚.
研究的目的:
- 为了研究ASO和DNA修复酶之间的相互作用.
- 为了阐明由ASOs诱导的凝结物形成的机制.
- 为了确定ASO诱导的核凝聚物对DNA损伤反应的功能后果.
主要方法:
- 在体外结合测试以评估ASO与DNA-PKcs,ATM和PARP1.1的相互作用.
- 同焦显微镜可视化ASO种子核凝聚物形成.
- 生物化学测试用于测量凝结物中招募的修复蛋白的酶活性.
- 细胞周期分析和DNA损伤量化,以评估细胞反应.
主要成果:
- ASO与DNA-PKcs,ATM和PARP1结合,诱导相位分离并形成核凝结物.
- 凝聚剂组合是由ASO度和ATM活动促进的,但是由DNA-PKcs活动抑制的.
- 这些ASO诱导的凝聚物激活DNA修复酶,在没有实际DNA损伤的情况下触发DNA损伤反应.
- 这种异常反应导致细胞周期检查点激活,内源修复受损,以及有毒DNA病变的积累.
结论:
- ASO可以通过与关键修复酶形成功能缩物来异常激活DNA修复通路.
- 这种机制有助于观察到的ASO毒性,并突出了核酸聚合物可能不适当地触发细胞反应的潜力.
- 这些发现提供了关于ASO诱导的毒性和DNA修复酶激活的调节的见解.
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