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扩大HSPB8肌病和远距离运动神经病变的分子和病理谱

Brendan Nicholas Putko¹, Eric J Sorenson¹, Gaofeng Cui²

¹Department of Neurology, Mayo Clinic, Rochester, MN.

Neurology. Genetics

|December 22, 2025

概括

两名患有HSPB8相关疾病的患者扩大了已知的肌肉病和神经病变的范围. 新型变体和蛋白质聚合模式为疾病机制提供了新的见解.

科学领域:

神经学神经学
遗传学是一个遗传学.
分子生物学分子生物学

背景情况:

热冲击蛋白家族B成员8 (HSPB8) 基因的突变与神经肌肉疾病有关,包括远端肌肉病,远端运动神经病变和夏科特-玛丽-图斯病.
与HSPB8相关疾病的全谱临床表现和潜在的分子机制尚未完全理解.

研究的目的:

扩大HSPB8相关疾病的分子和病理谱.
用临床数据和分子动力学模拟来研究新型和已知的HSPB8变体的影响.

主要方法:

对两名患有HSPB8变异的患者的临床和实验室数据的审查.
执行分子动力学模拟,以探索已识别变异的功能影响.
组织病理学检查肌肉活检.

主要成果:

患者1呈现出童年发病的远部虚弱和肌病性/神经性变化,携带一种新的HSPB8变种 (c.185G>A,p.Gly62Asp).
患者2表现出渐进的远端和近端虚弱与肌肉病和突出的TIA1聚合物,携带已知的HSPB8变体 (c.421A>G,p.Lys141Glu).
分子模拟表明p.Gly62Asp可能会影响翻译后修改,p.Lys141Glu可能会破坏蛋白质二分化.

结论:

该p.Gly62Asp变体代表了第一个与肌肉病相关的N终端HSPB8变体.
患者2的突出TIA1聚合物表明,p.Lys141Glu变体可能主要影响压力颗粒动力学,而不是Z盘完整性.
这些发现拓宽了对HSPB8相关神经肌肉疾病及其分子病理学的理解.

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