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微卫星在U2AF结合的多重体通道部位的不稳定性会在结直肠癌发病期间扰乱替代拼接
Vincent Jonchère1, Hugo Montémont1, Enora Le Scanf2,3
1Sorbonne Université, INSERM, Unité Mixte de Recherche Scientifique 938 and SIRIC CURAMUS, Centre de Recherche Saint-Antoine, Equipe Instabilité Des Microsatellites Et Cancer, Equipe Labellisée Par La Ligue Nationale Contre Le Cancer, 75012, Paris, France.
Genome biology
|August 6, 2024
概括
结直肠癌 (CRC) 中的微卫星不稳定性 (MSI) 推动了早期的RNA拼接变化,这些变化损害了细胞分化,促进了瘤的开始,先后发生了编码突变.
科学领域:
- 基因组学就是基因组学.
- 癌症生物学 癌症生物学
- 分子瘤学分子瘤学
背景情况:
- 由不匹配修复缺陷 (dMMR) 驱动的微卫星不稳定性 (MSI) 在结直肠癌 (CRC) 中很普遍.
- 在MSI CRC中基因组不稳定性的非编码后果尚未得到充分理解.
- 这项研究调查了整个结直肠瘤发生过程中的编码和非编码MSI事件.
研究的目的:
- 分析结直肠癌中编码和非编码MSI事件.
- 为了确定与MSI相关的拼接变化,在批量和单细胞水平.
- 了解MSI对结直肠瘤发生的早期病理生理影响.
主要方法:
- 整体外基因组测序 (WES) 用于识别编码和非编码MSI事件.
- RNA测序 (RNA-seq) 用于在批量和单细胞分辨率下检测拼接事件.
- 在结直肠瘤发生的不同阶段对MSI事件的分析.
主要成果:
- MSI会导致大量的非编码突变,特别是在聚皮里米丁位点,这些位点对于拼接至关重要.
- 在MSI CRC中,与非MSI CRC相比,exon跳转事件的发生频率明显高.
- 非编码的MSI突变在dMMR结肠密室中早期发生,导致异常拼接,损害细胞分化并增强免疫性.
结论:
- 一个早期的RNA拼接特征,部分由MSI驱动,损害细胞分化并促进CRC启动.
- 这些拼接变化在MSI瘤发生过程中代码突变的积累之前发生.
- 这些发现强调了非编码突变和拼接在MSI CRC早期发展中的关键作用.
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