与阿尔茨海默病风险相关的PLCG2表达和拼接的遗传学
Andrew K Turner1, Kennedy Dotson1, Qi Qiao2
1Department of Physiology and Sanders-Brown Center On Aging, University of Kentucky, 789 S Limestone St., Lexington, KY 40536 USA.
靠近PLCG2的基因变异通过改变PLCG2表达和拼接来影响阿尔茨海默病 (AD) 风险. 具体来说,rs1071644通过促进非功能性PLCG2异型,D65-PLCG2.2,增加AD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
- 阿尔茨海默氏症疾病研究研究
背景情况:
- 脂酶C玛2 (PLCG2) 通过特定的多态,包括rs72824905 (P522R) 和rs12446759.9,与阿尔茨海默病 (AD) 风险有遗传联系.
- 了解遗传变异如何影响PLCG2的表达和拼接对于阐明它在AD病变发生中的作用和开发潜在的治疗策略至关重要.
研究的目的:
- 研究基因变异对PLCG2表达和拼接与阿尔茨海默病风险相关的功能影响.
- 确定特定的遗传变异如何影响不同PLCG2mRNA异型的产生及其功能后果.
主要方法:
- 在人类大脑和血液样本中使用PCR和qRT-PCR对PLCG2异型表达的量化.
- 在BV-2微质细胞中使用小基因拼接试验对rs1071644单核酸多态 (SNP) 的功能分析.
- 在D65-PLCG2异形上评估无意中介衰变 (NMD) 并评估其与HEK293细胞中的正规PLCG2相比的反应.
主要成果:
- 鉴定了两种新的PLCG2异型:LNC-PLCG2和D65-PLCG2,具有改变的外因子使用.
- 与rs12446759基因型的LNC-PLCG2与PLCG2比率的关联以及与rs1071644.4的T等位基因的D65-PLCG2比率的增加.
- 证明rs1071644-T等位基因通过促进非功能D65-PLCG2单位基因的增加AD风险,该单位基因缺乏反应能力,易受NMD感染.
结论:
- 遗传风险因素rs12446759和rs1071644通过影响PLCG的独特机制调节阿尔茨海默病风险2.
- rs12446759影响了LNC-PLCG2与PLCG2的比率,而rs1071644影响了PLCG2外子28拼接,导致PLCG2功能丧失.
- 这些发现凸显了PLCG2剪接在AD病变发生过程中的重要性,并为风险降低策略提供了潜在的目标.
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