在拼接因子突变癌症中共享拼接异常的统一机制
bioRxiv : the preprint server for biology
|November 24, 2025
概括
与癌症相关的拼接因子突变引发了共享的DNA损伤反应,导致改变了激酶信号传递和在髓质性疾病中保留的常见内部程序. 这重新连接了拼接因子SRSF1的活动,影响了跨多种突变的替代拼接.
科学领域:
- 分子生物学分子生物学
- 癌症基因组学 癌症基因组学
- 在RNA分离过程中.
背景情况:
- 像SF3B1,U2AF1和SRSF2这样的拼接因子 (SF) 的突变会导致癌症中明显的替代拼接 (AS) 变化.
- 尽管发生了突变特异性的AS变化,但这些SF突变的相互排他性表明了趋同的下游机制.
研究的目的:
- 为了研究SF突变的髓状腺疾病中共享的AS转录组变化.
- 鉴定不同SF突变引起的AS变化的共同分子机制.
主要方法:
- 分析了来自395名克隆性髓质疾病患者和64名健康捐赠者的转录组.
- 研究了SF突变对酶信号通路 (AMPKα,AKT,SRPK1) 和SRSF1酸化的影响.
- 利用药理激活和缓解DNA损伤反应 (DDR) 来评估其在AS调节中的作用.
主要成果:
- 大多数AS变化是突变特异的,但涉及保留内子 (RI) 的子集在SF突变中很常见.
- SF突变导致SRSF1低酸化,通过改变AMPKα-AKT平衡损害其功能.
- 转录R环激活DDR,增加AMPKα和减少AKT活动,这有助于SRSF1低酸化和RI程序.
结论:
- SF-突变癌症的共同特征是具有转变作用的,压力驱动的AS特征,其特征是保留的内核程序.
- DNA损伤反应信号作为一个常见的上游触发器,重新连接SRSF1活动并影响AS.
- 针对连接复制应激,激酶信号和RNA处理的节点,可能为SF突变癌症提供治疗策略.
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