通过eccDNA驱动的VPS41放大减轻通过溶酶体KAI1降解的基因毒性压力
Bin Shi1,2, Ping Yang1, Huaijin Qiao1
1Laboratory of Radiation Medicine, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 24, 2025
概括
辐射诱导的染色体外圆形DNA (eccDNA),特别是VPS41,可以防止皮肤受伤. VPS41的过度表达通过降解KAI1来减少辐射损伤,从而增强细胞对遗传毒性压力的防御能力.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 辐射瘤学 辐射瘤学
背景情况:
- 像辐射这样的基因毒性疗法会导致正常组织损伤,包括皮肤损伤.
- 外染色体循环DNA (eccDNA) 的形成与DNA损伤和基因组不稳定性有关.
- 对于eccDNA在正常组织对基因毒性压力的反应中的作用基本上是未知的.
研究的目的:
- 为了研究eccDNA在被辐射的正常组织,特别是老鼠皮肤中的作用.
- 为了确定特定的eccDNA变异及其在基因毒性压力下的功能后果.
- 探索减轻辐射诱导皮肤损伤 (RISI) 的治疗策略.
主要方法:
- 使用Circle-seq分析了被辐射的老鼠皮肤中的eccDNA.
- 半定量PCR和凝电泳确定了辐射诱导的放大基因.
- 在体外和体外模型被用来评估eccDNA和VPS41.1.的效果.
- 蛋白质组分析,相互作用研究和基阵列阐明了蛋白质相互作用和机制.
主要成果:
- 辐射诱导了大鼠皮肤中eccDNA组成和数量的显著变化.
- 真空蛋白排序41同类 (VPS41) 是唯一的辐射诱导放大基因.
- 在体外和体内,eccDNA或VPS41的过度表达减少了辐射诱导的皮肤损伤 (RISI).
- VPS41与转移抑制剂Kangai-1 (KAI1) 相互作用,促进其溶酶体降解并保护其免受亡.
结论:
- 辐射诱导的eccDNA,特别是VPS41,在皮肤损伤方面起着保护作用.
- VPS41通过调节KAI1降解和防止辐射诱导的细胞死亡来减轻RISI.
- 这项研究揭示了一种新型的细胞防御机制,可以抵抗基因毒性压力,并建议治疗途径来增强组织的弹性.
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