NONO的核质拘禁屏蔽DNA双链断裂从异常的转录
Barbara Trifault1,2, Victoria Mamontova1,2, Giacomo Cossa2
1Mildred Scheel Early Career Center for Cancer Research (Mildred-Scheel-Nachwuchszentrum, MSNZ) Würzburg, University Hospital Würzburg, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany.
Nucleic acids research
|January 15, 2024
概括
对DNA损伤的反应涉及RNA结合蛋白. 这项研究揭示了一条核细胞通路,其中非POU域含有八聚体结合蛋白 (NONO) 被DNA损伤诱导的RNA与核细胞结合,帮助DNA修复.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- RNA结合蛋白是DNA损伤反应 (DDR) 的关键作用者.
- 众所周知,蛋白NONO/p54nrb在DNA双链断裂 (DSB) 时局部化到核和核细胞.
- 在DSB期间NONO核细胞重新定位的机制尚不清楚.
研究的目的:
- 阐明DNA损伤期间NONO核细胞重新定位的机制.
- 为了研究NONO在DNA损伤反应途径中的作用.
- 确定参与DDR的新型非编码RNA.
主要方法:
- 在人类癌细胞中诱导DNA双链断裂 (DSB) 的埃托化物治疗.
- 对依赖RNA聚合酶II的反意义跨基因非编码RNA (asincRNA) 生产的分析.
- 使用RNA识别动机1 (RRM1) 域的DNA-RNA杂交形成和NONO结合的研究.
- 评估NONO占用基因促进剂和mRNA前结合的评估.
- 对NONO的枯竭和突变研究,以评估其在DNA修复和信号传递中的作用.
主要成果:
- 埃托胺诱导来自核细胞间基因间隔区域的DNA损伤诱导性反感性跨基因非编码RNA (asincRNAs).
- 这些asincRNAs形成DNA-RNA混合体,通过其RRM1域将NONO连接到细胞核.
- 促进者的NONO占用率下降,减弱了前mRNA合成,并增加了NONO与前mRNA的结合.
- 预mRNA转录的子集被扣留在核中.
- NONO的枯竭或突变会损害转录的保留,并延长DSB信号传输.
结论:
- 描述了一种新的核细胞DNA损伤反应 (DDR) 途径,涉及NONO.
- 这一途径利用asincRNAs和DNA-RNA混合体来隔离NONO和核中异常转录.
- 这种机制保护NONO和受损的细胞组件,促进有效的DNA修复.
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