摘要
背景:APOE ε4是最知名的晚发性阿尔茨海默病(AD)的危险因素。人口研究表明,ε4在中国人群中发病率较低,可能存在其他中国特有的危险因素。除ε-等位基因外,有关载脂蛋白E全长遗传变异的研究较少。 目的:在本研究中,我们通过全面确定APOE的所有遗传变异,并研究它们与中国南方晚发性AD和轻度认知障碍(MCI)的潜在关联,填补了这一空白。 方法:研究招募了257名中国南方参与者,其中69名AD患者,83名MCI患者,105名正常对照组。从启动子到3''UTR区域的全长APOE测序。鉴定并比较了三组患者的遗传变异。 结果:APOE ε4在AD患者中更明显,但与中国其他地区及周边地区以及全球其他国家相比,中国南方AD患者的APOE ε4患病率最低。我们进一步鉴定了APOE中13个罕见的非单例变异。与MCI和正常受试者相比,携带任何一种罕见非单例变异的AD患者明显更多。这种差异仅在ε4等位基因非携带者中观察到。在已鉴定的罕见变异中,rs532314089、rs553874843、rs533904656和rs370594287的潜在功能影响被预测。 结论:我们的研究表明,中国南方AD的遗传风险构成存在种族差异。除APOE-ε4外,APOE罕见变异是AD风险分层生物标志物的潜在候选。
关键词: 阿尔茨海默病,轻度认知障碍,中国人,载脂蛋白E,罕见变异,遗传学
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