基础科学和病原发生学
Marcelo Madrid de Bittencourt1, Gabriela Mantovani Baldasso1, Marco Antônio De Bastiani1
1Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 24, 2025
概括
APOEε4等位基因显著改变了认知障碍患者的血液基因表达,创造了独特的转录组形状. 这些变化影响了阿尔茨海默病的生物标志物,如FDG-PET和Aβ42.
科学领域:
- 遗传学 遗传学 是一个
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 无脂蛋白E ε4 (APOEε4) 基因是散发性阿尔茨海默病 (AD) 的主要遗传风险因素.
- APOEε4等位基因对外周血液基因表达的影响,特别是与认知状态有关的影响,尚不清楚.
- 这项研究调查了APOEε4等位基因如何影响认知不受损 (CU) 和认知受损 (CI) 个体的血液基因表达.
研究的目的:
- 检查APOEε4等位基因对具有或没有认知障碍的个体血液基因表达模式的影响.
- 在认知状态的背景下,识别与APOEε4载体相关的特定基因表达特征.
- 探索APOEε4相关基因表达与阿尔茨海默病生物标志物之间的关系.
主要方法:
- 分析了ADNI数据库中423个个体的微阵列数据,按APOEε4载体和认知状态 (CU/CI) 分类.
- 使用R中的Limma包进行差异基因表达分析,在APOEε4载体和非载体组内比较CU和CI个体之间的基因表达.
- 路径丰富分析 (基因本体学,KEGG) 和线性回归模型将差异表达的基因 (DEG) 与脑脊液 (CSF) Aβ42,pTau181,总Tau和FDG-PET联系起来.
主要成果:
- 与非载体相比,具有认知障碍的APOEε4载体表现出明显的上调和下调基因模式.
- 丰富分析显示,携带者与先天免疫和MAPK信号传递相关的上调途径,而非携带者在与乌比奎丁相关的过程中显示了丰富.
- 有相当数量的DEG与阿尔茨海默病生物标志物相关,FDG-PET和Aβ42显示出显著的相关性,特别是在APOEε4载体中.
结论:
- APOEε4等位基因在认知障碍个体中显著影响血液基因表达,导致独特的转录组签名.
- 在APOEε4载体和非载体中,不同的基因表达特征有助于阿尔茨海默病关键生物标志物的变异性.
- 这些发现凸显了APOEε4在调节外围基因表达中的作用及其对AD病理生理学和生物标志物检测的潜在影响.
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