在COX18中双变异导致主要表现为外围神经病变的线粒体疾病
Camila Armirola-Ricaurte1,2, Laura Morant1,2, Isabelle Adant3,4
1Molecular Neurogenomics group, VIB Center for Molecular Neurology, VIB, 2610, Antwerp, Belgium.
Brain : a journal of neurology
|August 20, 2025
概括
这项研究确定COX18是导致夏科特-玛丽-图斯病 (CMT) 的新基因. 在COX18突变破坏线粒体复合IV组装,导致轴突神经病变和潜在的中枢神经系统问题.
科学领域:
- 遗传学
- 线粒体生物学
- 神经科学
背景情况:
- 在Charcot-Marie-Tooth病 (CMT) 中,线粒体动力学缺陷是常见的,但主要线粒体呼吸链 (MRC) 缺陷是非典型的.
- COX18是线粒体复合体IV (CIV) 的组合因子,对线粒体功能至关重要.
研究的目的:
- 确定导致夏科-玛丽-病 (CMT) 的新基因.
- 调查COX18在自体衰退性轴突CMT的病因中的作用.
主要方法:
- 整体外基因组测序和同胞性映射用于识别来自三个家族的受影响个体的遗传变异.
- 在患者衍生淋巴细胞和Drosophila melanogaster敲除模型中进行了功能研究,以评估已识别的COX18变异的影响.
- 对患者进行了神经和电生理评估.
主要成果:
- 在四个轴突CMT家族的8个个体中发现了COX18的双类有害变异,其中一些人表现出中枢神经系统症状.
- 在COX18中发生的同卵性拼接变体 (c.435-6A> G) 导致异常转录,稳定但有缺陷的COX18异形,CIV组合和活性受损,并减少了线粒体膜潜力.
- 在Drosophila melanogaster中,COX18同源的破坏导致神经退行和运动缺陷.
结论:
- COX18是一种新发现的基因,与自体逆性轴突CMT相关,可能涉及中枢神经系统.
- 这些发现突显了线粒体复合体IV功能障碍在CMT发病过程中的作用,并扩大了原发性线粒体疾病的范围.
- 这项研究为CMT患者的诊断评估提供了重要的见解.
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