替代拼接扩大了NDUFS6相关的线粒体疾病的临床谱
Camila Armirola-Ricaurte1, Noortje Zonnekein1, Georgios Koutsis2
1Molecular Neurogenomics group, VIB Center for Molecular Neurology, VIB, Antwerp, Belgium; Molecular Neurogenomics group, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium.
概括
这项研究确定了一种较轻的Charcot-Marie-Tooth神经病变 (CMT) 在患有NDUFS6基因变异的患者中,此前与严重的Leigh综合征有关. 替代拼接在这些线粒体疾病中显著影响疾病严重程度.
科学领域:
- 遗传学 是一个遗传学.
- 神经学 神经学
- 线粒体生物学 线粒体生物学
背景情况:
- 查洛-玛丽-牙神经病 (CMT) 是一组影响周围神经的遗传性疾病.
- 李氏综合征是一种严重的,往往致命的线粒体疾病,通常在婴儿期出现.
- NDUFS6基因对线粒体复合体I的功能至关重要.
研究的目的:
- 在临床和分子上对同卵性NDUFS6变体 (c.309+5G>A) 的患者进行表征.
- 调查这种变体患者中较轻微的表型背后的机制,此前与李氏综合征相关.
- 了解替代拼接在调节疾病严重性的作用.
主要方法:
- 对受影响个体进行临床检查.
- 在4名患者中进行全外体序列测序.
- 患者衍生淋巴细胞的功能研究,包括cDNA,蛋白质和线粒体分析.
- 补充DNA长读序列测序以评估替代拼接.
主要成果:
- 患者呈现出早期发病,缓慢进展的轴突CMT和阴囊,有些人表现出中枢神经系统症状.
- NDUFS6 c.309+5G>A变体导致异常拼接的转录和降低了正规的转录水平.
- 观察到突变蛋白质异型的减少,但未检测到线粒体复合体稳定性或生物能学的显著缺陷.
结论:
- 与NDUFS6相关的线粒体疾病的临床谱被扩展到包括轴突CMT.
- 在NDUFS6相关的CMT和利氏综合征之间存在显著的临床和病理生理重叠.
- 替代拼接极大地影响遗传疾病的严重程度,强调了评估拼接变体的重要性.
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