经常出现的CAPN3 p.Asp753Asn变体支持具有可变临床表现力的潜在主导性痛症
Giorgia D'Este1, Alejandro Giorgetti2, Denise Cassandrini3,4
1Neurobiology Laboratory, San Camillo IRCCS, Via Alberoni 70, 30126 Venezia, Italy.
International journal of molecular sciences
|December 11, 2025
概括
一种常见的肢体带肌肉缩 (LGMD) 突变,在CAPN3中的p.Asp753Asn,会导致从轻微的软弱到无症状的高肌酸酶的各种症状. 需要进一步的研究来证实其主导负效应.
科学领域:
- 遗传学 遗传学 是一个
- 神经学 神经学
- 分子生物学分子生物学
背景情况:
- 肢体带肌肉发育不良 (LGMDs) 是一组遗传性肌肉疾病.
- 最常见的形式,LGMD R1,是由CAPN3基因的突变引起的.
- 异卵性CAPN3变体越来越多地与自体主导LGMD (LGMD D4) 相关,但它们的机制尚不清楚.
研究的目的:
- 调查单基CAPN3变体的临床表现和致病作用,特别是p.Asp753Asn.
- 分析p.Asp753Asn变种患者的频率和表型谱.
主要方法:
- 追溯意大利多中心研究.
- 临床数据收集和分析的八个无关个体与单基CAPN3变体.
- 关于p.Asp753Asn变种的全球报告的文献综述.
- 对CAPN3蛋白质的结构建模.
主要成果:
- 在8名无关患者中,p.Asp753Asn替代是最常见的单基CAPN3变异.
- 患者年龄从6岁到80岁不等,表现包括无症状的CKCK高血症,炼性肌痛和轻微的近位弱点.
- 肌肉活检显示非特异性肌病变化,calpain-3表达减少.
- 结构建模表明,这种替代可能会影响蛋白质构成和域间相互作用.
- 文献审查发现了31个额外的病例,证实了复发和突出表型异质性.
结论:
- 该p.Asp753Asn变体是复发性的,并与一系列LGMD表型相关.
- 证据支持p.Asp753Asn的致病作用,可能是通过主导阴性机制,尽管需要进一步验证.
- 这些发现强调了单个CAPN3变异的诊断挑战,以及需要进行综合研究以了解机制和指导管理.
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