亨廷顿蛋白CAG重复大小变化低于亨廷顿病值:与抑郁症,焦虑症和基底腺节结构的关联
Magdalena Vater1, Nicolas Rost2,3, Gertrud Eckstein4
1Department Genes and Environment, Max Planck Institute of Psychiatry, Munich, Germany. vater.sci@gmail.com.
European journal of human genetics : EJHG
|November 21, 2024
概括
亨廷丁基因 (HTT) CAG重复大小,即使在非亨廷顿基因中也是如此.
科学领域:
- 神经遗传学 神经遗传学
- 精神病学遗传学 精神病学遗传学
- 分子精神病学分子精神病学
背景情况:
- 亨廷顿氏病 (HD) 与精神病症状有关,但亨廷丁基因 (HTT) CAG重复变异在常见精神疾病中的作用尚未得到充分研究.
- 亨廷丁基因 (HTT) 编码了一种对神经元功能至关重要的蛋白质,CAG重复扩张导致亨廷顿病.
- 了解HTT CAG重复中的非病理变异可能会为精神疾病的遗传结构提供见解.
研究的目的:
- 调查亨廷丁基因 (HTT) CAG重复大小变异与精神疾病,特别是严重抑郁症 (MDD) 和焦虑症 (ANX) 之间的关联.
- 探索HTT CAG重复等位基因之间的相互作用及其与临床表型和基底腺结构的关联.
- 为了确定HTT CAG在亨廷顿病范围之外的重复大小是否会影响常见精神疾病的风险.
主要方法:
- 一项基因病例控制研究,将MDD (n=2136) 和ANX (n=493) 患者的HTT CAG重复大小分布与健康对照 (n=1566) 进行比较.
- 使用回归模型来分析等位基因相互作用,临床表型和基底质结构 (核积体积).
- 分析包括年龄相关的效应和不同HTT CAG重复等位基因组合之间的相互作用.
主要成果:
- 在不完全透范围 (36-39次) 的HTT CAG重复大小在患者中并不比较常见.
- 在48岁以上的个体中,特定的HTT CAG重复组合 (例如13-20 ,21-26重复) 与焦虑障碍风险的改变有关.
- 观察到较短的HTT等位基因和核 accumbens体积之间的年龄依赖的负相关性,独立于诊断.
结论:
- 在非亨廷顿病范围内的HTT CAG重复大小调节了常见精神疾病的风险.
- 这些变异与基底质结构的年龄相关差异有关,特别是核 accumbens.
- 亨廷丁蛋白的正常变异可能在大脑功能和精神病风险中起作用.
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