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Alpha-B crystallin-related late-onset myopathy

Disease definition

A rare, genetic, alpha-crystallinopathy disease characterized by adult-onset myofibrillar myopathy, variably associated with cardiomyopathy and/or posterior polar cataracts. Patients typically present progressive proximal and distal muscle weakness and wasting of lower and upper limbs, often with velopharyngeal involvement including dysphagia, dysphonia and ventilatory insufficiency. Electromyography shows myopathic features and muscle biopsy reveals myofibrillar myopathy changes.


Classification level: Disorder
  • Synonym(s):
    • Alpha-B crystallin-related late-onset distal myopathy
    • Late-onset distal crystallinopathy
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal dominant 
  • Age of onset: Adult
  • ICD-10: G71.0
  • OMIM: 608810
  • UMLS: C5191079
  • MeSH: -
  • GARD: -
  • MedDRA: -

Detailed information

General public

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