在亨廷顿病中,CAG重复了针对体质不稳定的治疗药物的临床门
Sarah G Aldous1, Edward J Smith1, Christian Landles1
1Huntington's Disease Centre, Department of Neurodegenerative Disease and UK Dementia Research Institute at UCL, Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK.
Brain : a journal of neurology
|February 22, 2024
概括
亨廷顿病 (HD) 大脑中的体质CAG重复扩张对于疾病的发病不需要. 针对参与DNA修复的基因MSH3,在具有大量CAG重复扩张的小鼠模型中没有改变HD进展.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 亨廷顿病 (HD) 是由于亨廷丁基因的CAG重复扩张引起的,导致扩展的多重氨酸通道.
- 假设CAG重复不稳定性和大脑的体扩张对HD病变发生至关重要.
- 修复DNA不匹配基因MSH3是治疗点,因为它在CAG重复不稳定性中的作用以及在无糖性时缺乏相关的恶性瘤.
研究的目的:
- 为了研究体质CAG重复扩张在HD病变发生过程中的作用.
- 为了确定针对MSH3的治疗潜力,在一个具有很大的CAG重复扩张的HD小鼠模型中.
主要方法:
- 使用zQ175敲入鼠标模型的HD,携带大约 (CAG) 185重复扩展.
- 交叉了突变的亨廷丁等位基因与异合体和同合体Msh3淘汰背景.
- 评估了MSH3剥离对体质CAG重复扩张,亨廷丁聚合和大脑转录失调的影响.
主要成果:
- 完全切除Msh3阻止了体质CAG在大脑和外围的重复扩张.
- 将Msh3减少50%降低了体力扩张的速度.
- 在zQ175模型中,无论是MSH3消去还是MSH3水平降低,都没有影响huntingtin聚合或条形转录形状,与CAG重复时间较短的模型相比.
结论:
- 在患有大量CAG重复扩张的疾病模型中,大脑中体质CAG重复扩张不需要用于分子和神经病理表型的出现.
- 针对MSH3可能对患有大量CAG重复扩张的HD患者没有好处,因为进一步扩张不会加速疾病的进展.
- 针对HD的体力不稳定性的治疗干预措施应尽早实施,在显著扩张发生之前.
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