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基础科学和病原发生学

Marcelo Madrid de Bittencourt1, Gabriela Mantovani Baldasso1, Marco Antônio De Bastiani1

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概括
此摘要是机器生成的。

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.

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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.