短暂的双重重复扩张的多基因负担促进了阿尔茨海默病的风险
Michael H Guo1,2, Wan-Ping Lee3, Badri Vardarajan4
1Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA. michael.guo@pennmedicine.upenn.edu.
Nature communications
|January 28, 2025
概括
扩展短串重复 (STR) 与阿尔茨海默病 (AD) 风险增加有关. 具有超过30个STR扩张的个体,患AD的几率更高,神经病理更严重.
科学领域:
- 遗传学 遗传学 是一个
- 神经科学是一个神经科学.
- 基因组医学是基因组医学.
背景情况:
- 大多数阿尔茨海默氏病 (AD) 的遗传性仍然无法解释,这表明单核酸变异和短插入/删除之外的遗传变异的作用.
- 在基因组中丰富的短串重复 (STRs) 之前没有评估它们与AD风险的关联.
- 已知致病性STR扩张会导致30多种神经系统疾病,这促使人们对它们在阿尔茨海默病中的潜在作用进行调查.
研究的目的:
- 调查短串重复 (STR) 扩展与阿尔茨海默病 (AD) 风险之间的关联.
- 为了确定与对照人群相比,AD患者的STR扩张负担是否增加.
- 探索AD中STR扩张的基因组位置和潜在的功能影响.
主要方法:
- 312,731个多态STR通道的基因定型,使用来自2981个个体的PCR-free全基因组测序数据 (1489个AD病例,1492个对照).
- 开发一种方法来识别STR扩张作为人口中的异常通道长度.
- 统计分析以比较AD病例和对照个体之间的STR扩散的总负担.
主要成果:
- 与健康老年人对照组相比,AD患者的STR扩张增加了1.19倍 (p=8.27×10−3).
- 具有超过30个STR扩张的个体患有AD的几率高出3.69倍,并且呈现出更严重的神经病理.
- 发现与AD相关的扩展性STRs在活性促进体内被丰富,特别是在死后海马体组织中的SINE-VNTR-Alu (SVA) 逆转移体中.
结论:
- 扩展的短串联重复 (STR) 与阿尔茨海默病 (AD) 的风险增加有显著的关联.
- 较高的STR扩张负担与AD几率增加和更严重的神经病理学相关.
- 这些扩展的STRs在活性促进体中的丰富表明它们对AD病原体有所贡献的潜在机制.
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