与自闭症相关的ARHGEF9变体通过减少gephyrin酸化来损害GABAergic突触和超声波通信
Hyeji Jung1,2, Byeongchan Kim1, Gyubin Jang1,2
1Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), 333 Techno Jungangdae-Ro, Hyeonpoong-Eup, Dalseong-Gun, Daegu, 42988, Korea.
Molecular psychiatry
|November 1, 2025
概括
编码collybistin的ARHGEF9基因中的罕见变异与自闭症谱系障碍 (ASD) 有关. 这些遗传变化破坏了抑制性突触,通过改变gephyrin酸化,可能有助于ASD的发展.
科学领域:
- 神经遗传学 神经遗传学
- 突触生物学 突触生物学
- 发育神经科学的发展神经科学.
背景情况:
- 与X染色体相关的ARHGEF9基因变异 (collybistin) 是已知的智力障碍和的原因.
- 自闭症谱系障碍 (ASD) 是复杂的神经发育状况,具有遗传基础.
研究的目的:
- 调查ASD男性个体ARHGEF9基因的新鲜罕见变异.
- 阐明这些变异对突触功能的功能影响及其在ASD病变发生过程中的潜在作用.
主要方法:
- 外体序列测序用于识别ASD患者的ARHGEF9变体.
- 在体外功能测试 (COS-7细胞,海马神经元) 评估对基菲林聚类和突触密度的变异效应.
- 电生理学记录以评估突触传输.
- 氨酸酸3-酸盐 (PI3P) 的结合试验.
- 条件淘汰赛 (cKO) 鼠标模型 (mPFC 特定) 在体内研究突触和行为变化.
- 蛋白质组学分析以评估盖菲林酸化.
- 在cKO小鼠中使用ASD相关ARHGEF9变异的救援实验.
主要成果:
- 在患有自闭症的男性个体中发现了新的罕见ARHGEF9变异.
- 特定的变种 (p.R290C,p.V374F,p.G485S) 破坏了抑制性突触传输和gephyrin集群.
- p.G485S变异导致PI3P结合活性受损.
- 特定于mPFC的Cb-cKO小鼠表现出抑制性突触密度的改变,超声波发声障碍,以及降低基林酸化.
- 与ASD相关的ARHGEF9变体未能挽救突触缺陷,并在cKO小鼠中改变了基菲林酸化.
结论:
- 扰乱collybistin功能,影响诸如基菲林酸化和突触传播等多个方面,与ASD有关.
- 这些发现突显了ARHGEF9在神经发育障碍,特别是ASD中的作用.
- 准collybistin通路可能为ASD提供治疗途径.
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