阴性CAG在HTT基因的中间等位基因中的重复不稳定性及其与临床表型的潜在关联
Ainara Ruiz de Sabando1,2,3, Marc Ciosi4, Arkaitz Galbete5
1Department of Medical Genetics, Hospital Universitario de Navarra, IdiSNA, 31008, Pamplona, Spain.
European journal of human genetics : EJHG
|March 3, 2024
概括
亨廷顿病 (HD) 中间基因 (IAs) 显示体质CAG扩张,但这种不稳定性与携带者中类似HD的症状没有直接联系. 进一步的研究可能会在某些IA病例中澄清潜在的神经认知效应.
科学领域:
- 遗传学 是一个遗传学.
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 亨廷顿病 (HD) 是一种神经退行性疾病,与HTT基因的CAG重复扩张有关.
- 具有27-35个CAG重复的中间等位基因 (IAs) 通常不会引起HD,但它们与神经认知症状的关联受到争论.
- 已知HTT基因中的体质CAG扩张会影响HD的发病.
研究的目的:
- 为了研究HTT中间基因 (IA) 的体质不稳定性.
- 为了确定IA中的体质CAG扩张是否与表型呈现相关.
- 分析IA载体中的基因型-表型相关性.
主要方法:
- 使用MiSeq测序的血液DNA中的量化HTT体质CAG扩张,来自HD患者和IA携带者 (症状和对照) 的血液DNA.
- 分析了33次CAG重复的症状个体的大脑DNA.
- 在有症状的IA携带者身上进行了基因型-表型分析.
主要成果:
- 介质等位基因 (IAs) 在血液DNA中表现出CAG和年龄相关的体扩张.
- 在大脑中观察到+1和+2CAG的体扩张,在不同区域的频率有所不同.
- 在症状和控制IA载体之间没有发现血液体扩张的显著差异.
- 有症状的AI携带者表现出运动,认知和/或行为症状,发病时间晚,不依赖CAG.
结论:
- HTT中间等位基因 (IAs) 在体质上不稳定.
- 在这项研究中,IA的体扩张与HD类表型没有直接关联.
- 一些接近HD病理值的IA可能会在具有特定遗传背景的个体中导致神经认知症状.
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