Abstract
X-linked myotubular myopathy (XLMTM), a severe congenital myopathy, is caused by mutations in the MTM1 gene located on the X chromosome. A majority of affected males die in the early postnatal period, whereas female carriers are believed to be usually asymptomatic. Nevertheless, several affected females have been reported. To assess the phenotypic and pathological spectra of carrier females and to delineate diagnostic clues, we characterized 17 new unrelated affected females and performed a detailed comparison with previously reported cases at the clinical, muscle imaging, histological, ultrastructural and molecular levels. Taken together, the analysis of this large cohort of 43 cases highlights a wide spectrum of clinical severity ranging from severe neonatal and generalized weakness, similar to XLMTM male, to milder adult forms. Several females show a decline in respiratory function. Asymmetric weakness is a noteworthy frequent specific feature potentially correlated to an increased prevalence of highly skewed X inactivation. Asymmetry of growth was also noted. Other diagnostic clues include facial weakness, ptosis and ophthalmoplegia, skeletal and joint abnormalities, and histopathological signs that are hallmarks of centronuclear myopathy such as centralized nuclei and necklace fibers. The histopathological findings also demonstrate a general disorganization of muscle structure in addition to these specific hallmarks. Thus, MTM1 mutations in carrier females define a specific myopathy, which may be independent of the presence of an XLMTM male in the family. As several of the reported affected females carry large heterozygous MTM1 deletions not detectable by Sanger sequencing, and as milder phenotypes present as adult-onset limb-girdle myopathy, the prevalence of this myopathy is likely to be greatly underestimated. This report should aid diagnosis and thus the clinical management and genetic counseling of MTM1 carrier females. Furthermore, the clinical and pathological history of this cohort may be useful for therapeutic projects in males with XLMTM, as it illustrates the spectrum of possible evolution of the disease in patients surviving long term.
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Acknowledgements
We thank the patients and their families. Because facial features are part of the clinical picture, patients have kindly consented to the use of their clinical photographs without masking their faces. MRI images of patients F13 and F16 were kindly provided, respectively, by Dr Milja Holstila, Finland, and Dr Florence Caillon, France, and muscle biopsy from patient F3 was managed by Cardiobiotec Biobanck, Lyon, France. We thank Claire FEGER and Nadine KEMPF for technical assistance. This work was supported by the Institut National de la Santé et de la Recherche Médicale (INSERM), Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, the France Génomique National infrastructure, funded as part of the Investissements d’Avenir program managed by the Agence Nationale pour la Recherche (ANR-10-INBS-09), and Fondation Maladies Rares within the frame of the “Myocapture” sequencing project, ANR-10-LABX-0030-INRT under the frame program Investissements d’Avenir ANR-10-IDEX-0002-02, Fondation pour la Recherche Médicale (DBI20131228569) and AFM (AFM-16992) and CREGEMES for the MYOdiagHTS Project.
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VB and JL directed the study; VB, SS and MM performed the study; VB analyzed the data; all the others authors contributed materials; VB and JL wrote the manuscript.
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Informed consent was obtained from all individual participants included in the study. Additional informed consent was obtained from patients F4, F5, F16 and F17 for whom identifying photographic information is included in this article.
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Biancalana, V., Scheidecker, S., Miguet, M. et al. Affected female carriers of MTM1 mutations display a wide spectrum of clinical and pathological involvement: delineating diagnostic clues. Acta Neuropathol 134, 889–904 (2017). https://doi.org/10.1007/s00401-017-1748-0
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DOI: https://doi.org/10.1007/s00401-017-1748-0