通过削减PARP1和其他DNA损伤反应蛋白,AAV杀死分裂细胞
Sasha Friese1, Junjie Zai1, Grace Luzbetak2
1Department of Neurosciences, University of California San Diego, La Jolla, CA, United States.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
重组腺相关病毒 (rAAV) 基因治疗毒性源于其反向终端重复 (ITR) 与DNA修复蛋白相互作用. 破坏ITR针头可以减少这种毒性,为更安全的基因疗法铺平道路.
科学领域:
- 分子生物学分子生物学
- 基因治疗 基因治疗
- 毒理学 毒理学 毒理学
背景情况:
- 再组合腺相关病毒 (rAAV) 是基因疗法的关键载体,但其使用受到剂量依赖性毒性限制.
- 之前的研究发现rAAV的反转终端重复 (ITR) 对毒性至关重要,特别是T形发针结构.
- AAV ITR诱导的毒性和减轻它的策略的确切机制在很大程度上仍未被探索.
研究的目的:
- 阐明人类神经前体细胞 (hNPC) 中剂量依赖的rAAV毒性背后的分子机制.
- 调查是否针对这些机制可以减轻rAAV诱导的毒性.
- 评估AAV ITRT形发针在rAAV毒性的作用.
主要方法:
- 在分裂人类NPC (hNPC) 中诱导rAAV感染以观察细胞反应.
- 对细胞周期进展,DNA损伤标志物 (γH2AX,53BP1) 和ATM/CHK1/CHK2通路的分析.
- 基于亲和性的蛋白质组学用于识别与AAV ITR相互作用的蛋白质,包括DNA损伤反应 (DDR) 蛋白质.
- 评估聚ADP-ribose (PAR) 的形成和PARP抑制剂的作用.
- 工程 AAV ITRs 消除T形发针用于毒性评估.
主要成果:
- rAAV感染会触发hNPCs的异常细胞周期进展和DNA损伤反应.
- AAV ITRs与Poly- ((ADP-Ribose) 聚合酶1 (PARP1) 和其他单链断裂修复 (SSBR) 蛋白质结合.
- rAAV感染抑制了PAR的形成,模仿了PARP抑制剂的作用,它们也诱导了类似毒性的特征.
- 消除AAV ITR中的T形发针可以减少与SSBR蛋白质的结合,并减轻rAAV的毒性.
结论:
- rAAV感染诱导复制应激和细胞死亡在分裂hNPCs通过功能性耗尽必不可少的DDR蛋白质,如PARP1.
- 在AAV ITR中的T形发针对于启动DDR路径和驱动毒性至关重要.
- 针对ITR结构及其与DDR蛋白的相互作用,为开发更安全的RAAV基因疗法提供了一个有希望的策略.
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