这种SORL1 p.Y1816C 变种导致内体二分化受损和自体主导阿尔茨海默病
Anne Mette G Jensen1, Jan Raska2,3, Petr Fojtik1,2,3
1Department of Biomedicine, Aarhus University, Aarhus C DK8000, Denmark.
概括
一种特定的SORL1基因变异 (p.Y1816C) 与阿尔茨海默病 (AD) 有关. 这种变异破坏了正常的蛋白质流通,并导致神经元中的内体扩大,证实了它在阿尔茨海默病发病过程中的作用.
科学领域:
- 神经遗传学 神经遗传学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 在SORL1中截断变体是已知的阿尔茨海默病 (AD) 的原因.
- 在SORL1中误解变异很常见,但由于家族规模小,很难确定它们的致病性.
- SORL1基因编码了索尔林相关受体1 (SORLA) 蛋白质,这对内体贩运至关重要.
研究的目的:
- 在阿尔茨海默病中调查SORL1误解变异rs772677709 (p.Y1816C) 的致病性.
- 阐明SORL1 p.Y1816C变异对SORLA蛋白功能和细胞病理学的功能影响.
主要方法:
- 在三个与阿尔茨海默病无关的家庭中进行分离分析.
- 基于细胞的测试来评估SORLA受体的成熟,局部化和贩运.
- 调查SORLA同质化,内体贩运和细胞外SORLA (sSORLA) 的分泌.
- 诱导多能干细胞 (iPSC) 衍生神经元与工程 p.Y1816C 突变的分析.
主要成果:
- 在受影响的家族中,SORL1 p.Y1816C变异与阿尔茨海默病分离.
- 这种p.Y1816C突变损害了SORLA的同质化,减少了细胞表面的流通,并减少了sSORLA的分泌.
- 一个SORLA小受体的表达拯救了贩运缺陷.
- 具有p.Y1816C突变的iPSC衍生神经元表现出扩大的内分体,这是AD的一个标志.
结论:
- 这种SORL1 p.Y1816C误解变异为阿尔茨海默病的因果关系提供了遗传和功能证据.
- 这种变异的部分透性表明它在临床基因查早期发病的AD中的重要性,特别是在多重家族中.
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