与自闭症相关的基因CHD8的异合性删除通过基因表达和染色质紧缩的广泛变化损害了突触功能
Xi Shi1, Congyi Lu2, Alba Corman2
1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA; Department of Bioengineering, Massachusetts Institute of Technology, Cambridge, MA, USA; Broad Institute, Cambridge, MA, USA; Stanley Center for Psychiatric Research, Broad Institute, Cambridge, MA, USA.
American journal of human genetics
|October 6, 2023
概括
染色体螺旋酶DNA结合蛋白8 (CHD8) 突变会在自闭症谱系障碍 (ASD) 中损害神经元功能和基因表达. 恢复CHD8水平可以扭转这些缺陷,强调其在大脑发育中的关键作用.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学是一种遗传学.
- 发展生物学 发展生物学
背景情况:
- 整体外因子测序意味着自闭症谱系障碍 (ASD) 病因学中的新变异.
- 染色体螺旋酶DNA结合蛋白8 (CHD8) 是ASD中最常发生突变的基因.
- 对神经元基因组组织和功能的CHD8损失的功能影响仍然不太清楚.
研究的目的:
- 研究人类神经元中CHD8功能丧失突变的分子和功能后果.
- 描述基因表达,基因组组织和神经元活动的变化.
主要方法:
- 工程化同源人类胚胎干细胞系,具有CHD8功能丧失突变.
- 将分化细胞转化为人类皮层神经元以进行表征.
- 利用现场记录,单细胞电生理学和色素可访问性测试.
- 结果与来自Chd8+/-小鼠的原发皮质神经元进行了比较.
主要成果:
- 确定了数百个基因的变异表达,特别是那些参与神经发育和突触传播的基因.
- 在CHD8缺陷神经元中观察到神经元发射率和突触活动显著下降.
- 检测到开放色素的广泛增加,特别是在AUTS2基因附近.
- 证明这些功能缺陷在CHD8再表达时是可逆的.
结论:
- CHD8功能丧失突变导致神经元的显著分子和功能损伤.
- 改变CHD8+/-神经元中的基因表达和染色质可访问性与ASD和相关的神经发育障碍相关.
- CHD8是神经元和突触功能的关键调节者,对ASD的发病有影响.
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