在小鼠心脏发育过程中,T细胞因子7L2的异形切换
Bo Ye1,2, Lu Xiao3, Yuyong Xu1
1Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55455, USA.
Journal of molecular and cellular cardiology plus
|June 16, 2025
概括
Tcf7l2的替代拼接会产生独特的蛋白质异型,在发育和疾病期间调节心脏中的WNT信号传递. 在Tcf7l2异型中产后的切换可能会影响心肌细胞成熟.
科学领域:
- 心血管生物学 心血管生物学
- 分子生物学分子生物学
- 基因规则 基因规则
背景情况:
- 规范性WNT信号传递对心脏发育和疾病至关重要,但其特定于背景的机制尚未完全理解.
- Tcf7l2 (TCF/LEF转录因子7-like 2) 是WNT信号传输的关键核效应因子,与β-catenin相互作用.
- 假设Tcf7l2转录的替代拼接有助于心脏组织中的WNT信号特异性.
研究的目的:
- 调查Tcf7l2替代拼接在调解发育和产后心脏内WNT信号特异性的作用.
- 为了识别和表征不同的Tcf7l2异型,在胚胎和产后阶段存在于小鼠心室组织中.
主要方法:
- 从胚胎第17.5天和产后第8天的小鼠腹腔组织中克隆和测序Tcf7l2转录.
- 对替代拼接模式的分析,重点是对外显子的使用和C端外显子的变化.
- 反转录聚合酶连锁反应 (RT-PCR) 用于验证跨多个发育阶段的拼接模式.
主要成果:
- 从53个测序的转录中鉴定出32种不同的Tcf7l2异型,在4,6和17号外子的使用中存在显著差异.
- 替代拼接在C端外子 (14,15,16) 中突出,外子14的包含从胚胎到产后阶段显著增加.
- 异构体14插入创建了一个氧化还原开关域,而异构体18附近的腺因内改变了异构体结构,影响了关键的功能动机,并驱动了异构体转换 (E,S,M).
结论:
- Tcf7l2的替代拼接产生了具有独特功能域的多种蛋白质异型,影响了WNT信号通路.
- 在Tcf7l2异型中发生了产后,氧化还原敏感的开关,可能调节心肌细胞成熟.
- 这些发现提供了关于WNT信号在心脏发育和疾病中的上下文依赖机制的见解.
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