由22q11.2神经发育部位编码的线粒体蛋白调节神经干细胞和原始细胞的增殖
Philip D Campbell1,2, Isaiah Lee2, Summer Thyme3
1Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA.
Molecular psychiatry
|October 4, 2023
概括
线粒体基因 mrpl40 和 prodha 的遗传缺陷会导致斑马鱼的神经发育问题和小头症. 这些基因在神经干细胞增殖中发挥作用,将线粒体功能障碍与22q11.2DS联系起来.
科学领域:
- 神经遗传学 神经遗传学
- 发展生物学 发展生物学
- 线粒体生物学 线粒体生物学
背景情况:
- 22q11.2删除综合征 (22q11.2DS) 是精神分裂症和神经发育障碍的主要遗传风险因素.
- 线粒体功能障碍是22q11.2DS病变的假设贡献者,但具体的基因和机制仍然不清楚.
研究的目的:
- 使用斑马鱼模型系统地研究22q11.2DS基因在神经发育和行为中的作用.
- 确定在22q11.2DS区域内为神经发育表型作出贡献的特定线粒体基因.
主要方法:
- 对于37个保存的22q11.2DS正方形来说,生成了斑马鱼突变.
- 在七个试验中进行了高通量行为表型化.
- 分析了神经干细胞和原始细胞在已识别的突变体中的增殖.
主要成果:
- 确定了五种具有行为表型的单基因突变;两种,mrpl40和prodha,编码线粒体蛋白质.
- 药理上抑制线粒体功能和mrpl40/prodha突变导致了小头症.
- mrpl40和prodha突变体表现出异常的神经干细胞和祖细胞增殖,具有明显的细胞群体调节.
- 双重突变显示出加重的表型,揭示了mrpl40和prodha在辐射状细胞增殖中的部分冗余作用.
结论:
- 在脊椎动物大脑发育过程中,线粒体功能对神经干细胞和原生细胞群体至关重要.
- 神经发育期间的线粒体功能障碍与22q11.2DS模型中的大脑体积和行为表型有关.
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