在C9ORF72中线粒体DNA突变的起源和细胞类型特异性ALS-FTLD人类大脑器官
Yu Nie1,2, Kornélia Szebényi1, Lea M D Wenger1
1Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.
Science advances
|March 7, 2025
概括
在C9ORF72基因突变增加了脑细胞中的线粒体DNA突变,导致星质的功能障碍. 这项研究使用脑器官来调查ALS-FTLD中这些突变的起源.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
- 细胞生物学 细胞生物学
背景情况:
- 肌缩侧面硬化症 (ALS) 和前叶退化症 (FTLD) 在约20%的病例中具有遗传起源.
- C9ORF72基因突变是最常见的遗传原因,但区域性病理的原因尚不清楚.
- 在ALS-FTLD大脑中观察到线粒体DNA (mtDNA) 突变的增加,这表明线粒体参与,但它们的起源和时间不清楚.
研究的目的:
- 在C9ORF72重复扩张的背景下调查mtDNA突变的起源和负担.
- 了解星在ALS-FTLD中mtDNA突变的积累中的作用.
主要方法:
- 从患有C9ORF72重复扩张的患者的人类诱导多能干细胞 (hiPSC) 生成脑器官.
- 器官素与CRISPR校正的同位素和健康对照物的比较.
- 在天中分析mtDNA单核酸变异 (mtSNV) 负担.
主要成果:
- 在来自C9ORF72-突变器官的天中观察到较高的mtSNVs负担.
- 有证据表明,由于C9ORF72的重复扩张,一些新的mtSNVs出现.
- 一些mtSNVs逃避选择,达到更高的异质体水平.
结论:
- C9ORF72的重复扩张有助于增加星中的mtDNA突变负担.
- 在C9ORF72-ALS-FTLD大脑中mtSNVs的区域积累可能导致星线粒体功能障碍.
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