New phenotype and pathology features in MYH7-related distal myopathy

Enzo Ricci, Gabriella Silvestri, Giorgio Tasca, Mauro Monforte, Vincenzo Giglio, Pierfrancesco Ottaviani, S Penttilä, G Camastra, B. Udd

Risultato della ricerca: Contributo in rivistaArticolo in rivista

30 Citazioni (Scopus)

Abstract

Laing distal myopathy is an autosomal dominant disease due to mutations in the gene encoding for the human slow-β myosin heavy chain, MYH7. Most reports describe it as a mild, early onset myopathy with involvement usually restricted to foot extensors, hand finger extensors and neck flexors, and unspecific findings on muscle biopsy. We identified the first two Italian families with Laing distal myopathy, harboring two novel mutations in the MYH7 gene and performed clinical, neurophysiological, pathological, muscle MRI and cardiological investigations on affected members from the two families. Subjects from one family presented a moderate-severe phenotype, with proximal together with distal involvement and even loss of ambulation at advanced age. One patient displayed atypical muscle biopsy findings including cytoplasmic bodies and myofibrillar myopathy-like features. Affected members from the second family shared a very mild phenotype, with weakness largely limited to long toe and foot extensors and/or late onset. No patient showed any sign of heart involvement. Our study significantly broadens the clinical and pathological spectrum of Laing distal myopathy. We suggest that MYH7 screening should be considered in undiagnosed late-onset distal myopathy or cytoplasmic body myopathy patients.
Lingua originaleEnglish
pagine (da-a)640-647
Numero di pagine8
RivistaNeuromuscular Disorders
Volume22
DOI
Stato di pubblicazionePubblicato - 2012

Keywords

  • Citoplasmic body
  • Laing distal myopathy
  • MYH7

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