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在TUBA4A中错误的变异会导致肌管瘤病变

Mridul Johari¹, Chiara Folland¹, Yoshihiko Saito²

¹Harry Perkins Institute of Medical Research, Centre for Medical Research, University of Western Australia, Nedlands, WA, Australia.

medRxiv : the preprint server for health sciences

|July 16, 2025

概括

这项研究确定了新的TUBA4A基因变异,导致轴性肌肉病变和多系统蛋白质病变,扩大了这些疾病的已知范围,超出了神经退行.

科学领域:

遗传学是一个遗传学.
神经学神经学
分子生物学分子生物学

背景情况:

由蛋白基因变异引起的蛋白病变与神经退行性疾病有关.
之前的研究重点是TUBA4A错误变体导致神经退行性表型.
与TUBA4A相关的疾病的全谱仍未完全表征.

研究的目的:

描述TUBA4A相关疾病的全表型和基因型谱.
为了识别新的TUBA4A变异及其相关的临床表现.
研究TUBA4A变异对蛋白质功能和微管子动态的影响.

主要方法:

多中心研究确定了来自19个家族的31个个体的新型TUBA4A误解变异.
临床表型,包括评估肌肉衰弱,神经参与和心脏功能.
对遗传模式的分析 (自体主导,同卵性,新生,零星).
肌肉活检,免疫组织化学,体和体外检查.

主要成果:

在31个个体中确定了13种新的TUBA4A误解变异.
主要轴性肌肉病是主要的表型 (17/19个家族),通常不涉及中枢神经系统.
两个家庭出现了小脑,和肌肉衰弱,表明多系统蛋白质病变.
观察到不同的基因型和遗传模式,包括同卵性和de novo变异.
肌肉活检显示了肌肉病变和TUBA4A积累;体外研究表明微管动力学受损.

结论:

TUBA4A变异会导致一系列的肌管类病变,包括初级轴性肌肉病变和多系统蛋白质病变.
现型谱范围超越神经退行,包括显著的肌肉参与.
在轴性肌肉病变和多系统蛋白病变的差异诊断中,即使没有中枢神经系统症状,也应该考虑TUBA4A变异.

关键词:

自自是自的过程.基因型-表型相关性相关性蛋白质聚合物肌病症蛋白质聚合物肌病症管道中的管道.输卵管内病变 (tubulinopathy) 是一种输卵管内病变.

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