Generalized muscle pseudo-hypertrophy and stiffness associated with the myotilin Ser55Phe mutation: a novel myotilinopathy phenotype?

Josep Gamez, Judith Armstrong, Alexey Shatunov, Albert Selva-O'Callaghan, Rosa Dominguez-Oronoz, Arantxa Ortega, Lev Goldfarb, Isidre Ferrer, Montse Olivé

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    Myotilinopathies are a group of muscle disorders caused by mutations in the MYOT gene. It was first described in two families suffering from limb girdle muscle dystrophy type 1 (LGMD 1A), and later identified in a subset of dominant or sporadic patients suffering from myofibrillar myopathy, as well as in a family with spheroid body myopathy. Disease phenotypes associated with MYOT mutations are clinically heterogeneous and include pure LGMD forms as well as late-onset distal myopathies. We report here on a 53-year-old male suffering from a unique clinical profile characterized by generalized symmetrical increase in muscle bulk leading to a Herculean appearance. Muscle weakness and stiffness in the lower extremities were the patient's main complaints. Muscle MRI showed extensive fatty infiltration in the thigh and leg muscles and a muscle biopsy showed a myofibrillar myopathy with prominent protein aggregates. Gene sequencing revealed a Ser55Phe missense mutation in the myotilin gene. The mutation was identified in his older brother, who presented a mild hypertrophic appearance and had a myopathic pattern in EMG, despite not presenting any of the complaints of the proband and having normal muscle strength. This finding, and his deceased father and paternal aunt's similar gait disorders, suggest that this is in fact a new autosomal dominant kindred. The present observations further expand the spectrum of clinical manifestations associated with mutations in the myotilin gene.

    Original languageEnglish
    Pages (from-to)167-71
    Number of pages5
    JournalJournal of the Neurological Sciences
    Volume277
    Issue number1-2
    DOIs
    Publication statusPublished - 15 Feb 2009

    Keywords

    • Biopsy
    • Connectin
    • Cytoskeletal Proteins
    • Family Health
    • Humans
    • Hypertrophy
    • Magnetic Resonance Imaging
    • Male
    • Middle Aged
    • Muscle Proteins
    • Muscle Rigidity
    • Muscle Weakness
    • Muscular Diseases
    • Phenotype
    • Point Mutation
    • Case Reports
    • Journal Article
    • Research Support, Non-U.S. Gov't

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