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A new MPZ mutation associated with a mild CMT1 phenotype presenting with recurrent nerve compression

Authors

  • Armelle Magot MD,

    Corresponding author
    1. Centre de Référence Maladies Neuromusculaires de l'Enfant et de l'Adulte Nantes-Angers, Hôtel Dieu 44093, Nantes Cedex, France
    2. Laboratoire d'Explorations Fonctionnelles, Hôtel-Dieu, Nantes, France
    • Centre de Référence Maladies Neuromusculaires de l'Enfant et de l'Adulte Nantes-Angers, Hôtel Dieu 44093, Nantes Cedex, France
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  • Philippe Latour MD,

    1. Laboratoire de Biochimie Pédiatrique, Hôpital Debrousse, Hospices Civils de Lyon, Lyon, France
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  • Jean-Marie Mussini MD,

    1. Centre de Référence Maladies Neuromusculaires de l'Enfant et de l'Adulte Nantes-Angers, Hôtel Dieu 44093, Nantes Cedex, France
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  • Reda Mourtada MD,

    1. Service de Neurologie, Hôpital Pontchaillou, Rennes, France
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  • Pierre Guiheneuc MD,

    1. Laboratoire d'Explorations Fonctionnelles, Hôtel-Dieu, Nantes, France
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  • Yann Pereon MD, PhD

    1. Centre de Référence Maladies Neuromusculaires de l'Enfant et de l'Adulte Nantes-Angers, Hôtel Dieu 44093, Nantes Cedex, France
    2. Laboratoire d'Explorations Fonctionnelles, Hôtel-Dieu, Nantes, France
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Abstract

P0 is a transmembrane protein of the immunoglobulin superfamily that plays a role in myelin structure and function. Myelin protein zero gene (MPZ) mutations usually cause a demyelinating variant of Charcot–Marie–Tooth disease type 1B (CMT1B), but there is a wide spectrum of phenotypic manifestation of these mutations. We describe three patients from one family and one separate patient who presented with a demyelinating neuropathy. Some had recurrent lesions at compression sites mimicking hereditary neuropathy with liability to pressure palsies (HNPP). A heterozygous nonsense mutation (Tyr145Stop) corresponding to a T-to-A transition at nucleotide position 435 in exon 3 of the MPZ gene was identified in all patients. This mutation leads to an extracellular truncated protein, which may explain the mild phenotype. Therefore, such MPZ gene mutations should be searched for in cases of demyelinating neuropathy with acute nerve compression as well as in cases of the HNPP phenotype associated with normal the PMP22 gene. Muscle Nerve, 2008

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