导致早期痴呆症并增加阿尔茨海默病风险的TREM2变体会影响基因拼接
Kostantin Kiianitsa1, Maria E Lukes2, Brian J Hayes3
1Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA 98195, USA.
Brain : a journal of neurology
|January 16, 2024
概括
在骨髓细胞2 (TREM2) 变体上表达的触发受体会通过改变的拼接引起神经退行性疾病. 这项研究揭示了TREM2变体中的拼接缺陷,影响了阿尔茨海默病和前性痴呆风险.
科学领域:
- 神经遗传学 神经遗传学
- 分子生物学分子生物学
- 基因组学就是基因组学.
背景情况:
- 在TREM2中功能丧失的变体与神经退行性疾病有关,如纳苏-哈科拉病,前性痴呆症 (FTD) 和阿尔茨海默病 (AD).
- 虽然一些变体导致过早终止或异常拼接,但影响TREM2蛋白功能的误解变体的机制仍然不清楚.
研究的目的:
- 调查与疾病相关的TREM2变异是否通过改变拼接导致病理.
- 阐明神经退行性疾病中TREM2变异的致病机制.
主要方法:
- 利用SpliceAI算法来预测TREM2变体的拼接效应.
- 雇佣的拼接记者测定,qRT-PCR和西部斑点来量化拼接变化.
- 分析了纳苏-哈科拉病患者的TREM2RNA水平和脑RNA-Seq数据集中的外显子跳转.
主要成果:
- 确定了拼接缺陷是几个纳苏-哈科拉病和早期FTD变体 (例如D134G,V126G,K186N) 的首要或促成原因.
- 在痴呆症患者 (A130V,L133L,R136W) 丰富的变体中观察到对外基因2和3的较轻的拼接效应.
- 已确认的拼接缺陷,包括过度的外因子2跳转导致潜在的对抗性TREM2异型,用于常见的AD/FTD风险变体 (R62H,T96K).
结论:
- 与疾病相关的TREM2变体可以通过拼接变化发挥致病性,有时与对蛋白质功能的影响共存.
- 研究结果强调了分析转录后基因调节 (包括拼接) 的重要性,以了解与TREM2相关的神经退行性疾病.
- 这项工作强调了TREM2遗传变异的复杂性及其对大脑健康的影响.
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