罗宾诺综合征中的致病性DVL框架转移变体破坏了WNT信号传递和细胞动态
bioRxiv : the preprint server for biology
|August 6, 2025
概括
致病性DVL基因变异导致罗宾诺综合征,通过阻止DVL蛋白重新定位和WNT激活来破坏WNT信号传递. 这些发现澄清了这种罕见遗传疾病背后的细胞机制.
科学领域:
- 遗传学 遗传学是一种遗传学.
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
背景情况:
- 罗宾诺综合征 (RS) 是一种罕见的遗传疾病,与WNT/平面细胞极性 (PCP) 途径有关.
- 在DVL基因中的框架转移变异是主导RS的重要原因,产生异常的C端蛋白延伸.
研究的目的:
- 为了研究致病性DVL框架转移变体与扩展的C-终端的细胞效应.
- 阐明这些变异破坏WNT信号传递并导致RS表型的分子机制.
主要方法:
- 对DVL变体的结构和特性进行体分析.
- 生产和体外分析野生类型 (WT),框架转移和截断的DVL结构 (DVL1,DVL2,DVL3).
- 免疫细胞化学用于蛋白质定位,TOPFlash记者测试WNT通路激活,并分析CSNK1E诱导的酸化.
主要成果:
- 突变的DVL蛋白质表现出改变的预测结构,并且在WNT3A刺激时未能重新定位,与WT DVL不同.
- 突变DVL1和DVL3在TOPFlash测试中未能激活正规WNT信号.
- 突变的C端尾部损害了CSNK1E诱导的酸化,这表明信号传输中断的机制.
结论:
- 致病性DVL移变体通过损害DVL蛋白功能和局部化来破坏WNT/PCP信号传输.
- 这些细胞缺陷为罗宾诺综合征中观察到的发育异常提供了洞察力.
- 了解这些机制可以为未来对RS和相关WNT通路障碍的研究提供信息.
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