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在患有缺血小血管疾病的患者中,A Novel APP p.V742L变异增强了FE65信号传递
Bas J B Voesenek1, Julie W Rutten2, Monique P C Mulder3
1Department of Human Genetics, Leiden University Medical Center, 2333 ZC Leiden, the Netherlands.
Neurobiology of disease
|January 27, 2026
概括
一种新的粉样蛋白前体蛋白基因 (APP) 变体,APP p.V742L,与缺血小血管疾病有关. 这种变异增强了APP细胞内域 (AICD) 与FE65的相互作用,改变了基因转录,并表明了新的APP相关脑疾病表型.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 粉样蛋白前体蛋白基因 (APP) 的致病变体与阿尔茨海默病和大脑粉样蛋白血管病变有关,通常会影响粉样β域.
- 这些已知的APP变体通常会增加有毒粉样β的产生或聚合.
研究的目的:
- 为了研究在患有缺血小血管疾病的患者中发现的位于APP细胞内域 (AICD) 的新型APP p.V742L变异.
- 确定APP p.V742L变异对AICD功能,基因表达和蛋白质相互作用的功能影响.
主要方法:
- 来自患者的纤维细胞被用于免疫细胞化学,以评估APP亚细胞局部化.
- 进行了3'mRNA测序以分析基因表达变化.
- 采用共免疫沉,其次是西部涂抹,以调查AICD及其绑定伙伴FE65.65之间的相互作用.
主要成果:
- APP p.V742L 变种显示了对溶酶体的局部化增加,而不会影响溶酶体运动性.
- 转录组分析揭示了AICD基因的改变表达和与缺血性中风相关的基因失调.
- APP p.V742L显示与FE65,一个关键的细胞内结合伙伴的增强相互作用.
结论:
- 该APP p.V742L变异增强了AICD与FE65的相互作用,导致基因转录失调.
- 这项研究确定了缺血小血管疾病作为与APP变异相关的新型表型.
- 这些发现突出了APP在各种大脑疾病中的多样性作用,超出了传统的粉样β相关病理.
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