Journal
EUROPEAN JOURNAL OF NEUROLOGY
Volume 22, Issue 11, Pages 1429-1435Publisher
WILEY
DOI: 10.1111/ene.12814
Keywords
mitochondria; myofibrillar; myopathies; Z-disc
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Myofibrillar myopathies are a genetically diverse group of skeletal muscle disorders, with distinctive muscle histopathology. Causative mutations have been identified in the genes MYOT, LDB3, DES, CRYAB, FLNC, BAG3, DNAJB6, FHL1, PLEC and TTN, which encode proteins which either reside in the Z-disc or associate with the Z-disc. Mitochondrial abnormalities have been described in muscle from patients with a myofibrillar myopathy. We reviewed the literature to determine the extent of mitochondrial dysfunction in each of the myofibrillar myopathy subtypes. Abnormal mitochondrial distribution is a frequent finding in each of the subtypes, but a high frequency of COX-negative or ragged red fibres, a characteristic finding in some of the conventional mitochondrial myopathies, is a rare finding. Few invitro studies of mitochondrial function have been performed in affected patients.
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