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在芬兰的一组轴性肌肉病患者中,TTN截断变体的过度代表性
Maria Francesca Di Feo1,2,3, Giuliana Capece4, Marco Savarese1
1Folkhälsan Research Center, Helsinki, Finland.
European journal of neurology
|February 17, 2026
概括
异卵性TTN变体在晚期发病的轴性肌肉病变症患者中显著丰富,这表明在这种疾病中发挥了作用. 这一发现扩大了对提丁相关疾病的理解,并支持TTN对无法解释的轴性肌肉病变的基因测试.
科学领域:
- 神经学 神经学
- 遗传学 是一个遗传学.
- 罕见疾病 罕见疾病
背景情况:
- 晚期发病的轴性肌肉病变会导致准脊椎的软弱,导致脊椎曲或头部掉落,遗传基础不完全理解.
- 在一般人群中,TTN的截断变体 (TTNtv) 发现在约1%的患者中;双性TTNtv会导致衰退型滴状病变.
- 心脏外中的TTNtv增加了穿透不完全的心肌病的风险.
研究的目的:
- 为了研究晚期发作的轴性肌肉病变的遗传基础.
- 为了确定异合体TTNtv是否在患有这种疾病的患者中被丰富.
主要方法:
- 追溯分析55名芬兰成年人晚期发作的轴性肌肉病变.
- 临床,成像和组织病理学数据的收集.
- 使用MYOcap定向下一代测序小组进行基因测试.
主要成果:
- 与一般人群相比,在16%的患者中发现异合体TTNtv,显著丰富 (OR=14.1,p≈5×10−8).
- 变种是极为罕见的,分布在骨肌体表达的表因子上;五个不在gnomAD.
- 发病时的平均年龄为60岁;坎普托科尔米亚是MRI上具有特征的椎骨肌肉变化的主要表现.
结论:
- 异合体TTNtv在晚期发作的轴性肌肉病变中显著丰富,这表明对表型的贡献.
- 这些发现扩大了与titin相关的疾病的临床范围.
- 支持将TTN纳入因特异性轴性肌肉病的遗传检测中.
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