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YTHDC1与THO复合体合作,防止RNA损伤引起的DNA断裂

Ning Tsao¹, Patrick M Lombardi², Ajin Park³

¹Department of Pathology & Immunology, Center for Genome Integrity, Washington University School of Medicine, St. Louis, MO 63110, USA.

|March 4, 2025

概括

核RNA损伤可能会损害基因组完整性. YTHDC1蛋白调节对化损伤的反应,防止受损RNA引起的DNA断裂,这对于保持基因组稳定至关重要.

科学领域:

分子生物学分子生物学
基因组学就是基因组学.
细胞生物学细胞生物学

背景情况:

环境毒素和化疗药物可以破坏DNA和RNA.
RNA损伤对细胞功能,特别是基因组完整性的后果尚不清楚.
大多数核酸添加物发生在RNA中,突出了研究RNA损伤效应的必要性.

研究的目的:

研究核RNA损伤对人类细胞基因组完整性的影响.
阐明RNA损伤导致基因组不稳定的机制.
确定参与调节细胞对RNA损伤反应的关键蛋白质.

主要方法:

研究了YTHDC1蛋白在调节化损伤反应中的作用.
检查了YTHDC1与RNA中的N1-甲基氨酸 (m1A) 修饰的结合.
评估了YTHDC1或THO复合体 (THOC) 表达变化的细胞中的DNA断裂和对化损伤的敏感性.
利用RNA特异性交易基酶来评估救援效应.
研究了R-循环形成和XPG核酶在RNA损伤诱导的DNA断裂 (RDIBs) 中的作用.

主要成果:

核RNA损伤可能导致人类细胞中基因组完整性丧失.
YTHDC1通过与THO复合体 (THOC) 相互作用来调节化损伤反应.
在RNA中,YTHDC1结合了N6-甲基氨酸 (m6A) 和化学诱导的N1-甲基氨酸 (m1A).
缺乏YTHDC1的细胞对化损伤和DNA断裂的敏感性增加.
这些RNA损伤诱导的DNA断裂 (RDIBs) 取决于R循环形成和XPG核酶.
核RNA m1A甲基转移酶可以在没有YTHDC1或THOC的情况下诱导DNA断裂.

结论:

损坏的核RNA可以直接影响和损害基因组完整性.
YTHDC1在抗RNA损伤的细胞防御中发挥着关键作用,防止DNA断裂.
这项研究揭示了一个新的途径,RNA损伤,R环形成和XPG活动导致DNA断裂.
这些发现为RNA损伤如何影响基因组稳定性提供了机械的见解.

关键词:

在R-Loop中使用.这是一个RNARNARNARNARNA.YTH 域名域名这是一种基化.基地损伤损伤的基础.

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