在阿尔茨海默氏病的风险变体中存在阿尔茨海默氏病的风险变体
bioRxiv : the preprint server for biology
|June 9, 2023
概括
一种新的阿尔茨海默氏病 (AD) 风险变体在三基因重复域3 (TTC3) 基因中影响神经元的发育和功能. 这种TTC3变体破坏了actin细胞骨架,导致细胞变化,可能有助于AD的发病.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 晚期阿尔茨海默氏病 (AD) 的发病包括复杂的遗传因素.
- 四重复域3 (TTC3) 基因与神经元功能有关,但其在阿尔茨海默病中的作用尚未完全理解.
研究的目的:
- 为了研究与家族性阿尔茨海默病相关的TTC3基因中的误解变异 (p.S1038C) 的功能后果.
- 用患者衍生的诱导多能干细胞 (iPSC) 和分化皮质神经元来建模变异的效应.
- 探索底层的细胞机制,特别是actin细胞骨架的作用.
主要方法:
- 通过CRISPR基因组编辑,将TTC3 p.S1038C变体引入iPSC细胞.
- 差异化的同源性iPSC线路进入皮层神经元.
- 转录组分析以确定受影响的基因通路.
- 功能性测试用于评估细胞形态,迁移,神经元外生和突触蛋白表达.
- 药理学操纵的目标是作用素细胞骨架.
主要成果:
- 这种TTC3 p.S1038C变异减少了TTC3的表达,改变了AD相关基因的表达 (BACE1,INPP5F,UNC5C).
- 从iPSC衍生的神经元表现出神经元长度增加,分支和突触蛋白水平改变.
- 变异细胞显示了改变的3D形态和增加的迁移.
- 这些细胞表型通过用Cytochalasin D.向actin细胞骨架来改善.
结论:
- 该TTC3 p.S1038C变体显著影响神经元发育和突触功能.
- 动氨酸细胞骨的破坏是与这种AD风险变体相关的细胞表型的关键机制.
- 向actin细胞骨可能为与TTC3变异相关的AD提供治疗策略.
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