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由于MBNL抑制和RNA错误拼接导致的1型肌性衰变的自闭症特征
Lukasz Sznajder1, Mahreen Khan2, Mariam Tadross3
1University of Nevada, Las Vegas.
Research square
|August 30, 2023
概括
与肌性缩相关的DMPK基因的并列重复扩张可以导致自闭症谱系障碍. 这通过肌肉盲样 (MBNL) 蛋白抑制发生,导致自闭症风险基因的发育错误拼接.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
背景情况:
- 协同重复扩张经常在自闭症谱系障碍 (ASD) 中观察到.
- 肌性缩症1型 (DM1) 是由DMPK基因中CTG重复扩张引起的.
- 存在ASD和DM1之间的临床联系,但分子联系尚不清楚.
研究的目的:
- 阐明将DMPK CTG重复扩张与自闭症谱系障碍联系起来的分子机制.
- 研究肌肉盲样 (MBNL) 拼接因子在这个过程中的作用.
- 为拟议的病理机制建立体内证据.
主要方法:
- 研究了扩展的CUGRNAs对拼接因子的影响.
- 在大脑发育过程中分析了自闭症风险基因的拼接模式.
- 使用CTG扩展和MBNL-null鼠标模型.
- 在小鼠模型中评估社会行为.
主要成果:
- 扩展的CUGRNAs可以抑制肌肉盲样 (MBNL) 拼接因子.
- 这种抑制改变了神经发育过程中与自闭症相关的微外显子的拼接.
- CTG扩展和MBNL-null小鼠模型表现出与自闭症相关的错误拼接配置文件.
- 这些小鼠模型显示了自闭症特征的社会缺陷.
结论:
- DMPK CTG重复扩张相关的自闭症是由于MBNL抑制导致的发育错误拼接引起的.
- 这项研究揭示了一条机械路径,将肌性缩重复扩张与自闭症特征联系起来.
- 这些发现为进一步研究自闭症的分子基础开辟了道路.
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