剂量敏感的RBFOX2自我调节通过成熟转录基因组促进心肌细胞分化
bioRxiv : the preprint server for biology
|November 24, 2025
概括
减少RNA剪接调节器RBFOX2水平会损害心肌细胞分化,导致先天性心脏病 (CHD). 这发生在受损的自我调节和改变的基因拼接过程中,影响心脏的发育和功能.
科学领域:
- 分子生物学分子生物学
- 心血管研究研究心血管研究
- 发展生物学 发展生物学
背景情况:
- RNA剪接调节器RBFOX2的发生不足与先天性心脏病 (CHD) 有关.
- 连接RBFOX2与CHD的精确致病机制在很大程度上是未知的.
- 通过替代拼接,RBFOX2在调节基因表达方面发挥着至关重要的作用.
研究的目的:
- 阐明RBFOX2在心肌细胞分化中的作用及其对心脏病发病的贡献.
- 研究RBFOX2的自我调节拼接机制及其对异形生成的影响.
- 确定ACTN2过度表达是否可以拯救与RBFOX2缺乏相关的表型.
主要方法:
- 在心肌细胞分化中的RBFOX2功能的分析.
- 研究瘤,细胞骨和焦点粘附基因中的拼接模式.
- 评估在相互排斥的原体上进行自我调节的拼接.
- 产生和分析异构和零模型.
- 功能性救援实验涉及ACTN2过度表达.
主要成果:
- RBFOX2对于心肌细胞分化至关重要,促进成熟的拼接模式.
- 异构细胞的自我调节受损导致异构形态比率偏差和主导负的产物.
- 过度表达的α-actinin-2 (ACTN2) 通过恢复收缩性来拯救异合体表型.
- 一个涉及RBFOX2上调和转录组成熟的机械感知反循环被ACTN2救援激活.
结论:
- 降低RBFOX2剂量通过破坏自身调节和拼接,损害心肌细胞分化.
- 这些干扰有助于心血管疾病的发病和心力衰竭的易感性.
- RBFOX2自调节对于维持正常的心脏发育和功能至关重要.
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