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Mitochondrial myopathy with dystrophic features due to a novel mutation in the MTTM gene. | LitMetric

Mitochondrial myopathy with dystrophic features due to a novel mutation in the MTTM gene.

Muscle Nerve

Department of Neurology, Columbia University Medical Center, College of Physicians & Surgeons, 630 West 168th Street, New York, New York, USA.

Published: August 2014

AI Article Synopsis

Article Abstract

Introduction: A 61-year-old woman with a 5-year history of progressive muscle weakness and atrophy had a muscle biopsy characterized by a combination of dystrophic features (necrotic fibers and endomysial fibrosis) and mitochondrial alterations [ragged-red, cytochrome c oxidase (COX)-negative fibers].

Methods: Sequencing of the whole mtDNA, assessment of the mutation load in muscle and accessible nonmuscle tissues, and single fiber polymerase chain reaction.

Results: Muscle mitochondrial DNA (mtDNA) sequencing revealed a novel heteroplasmic mutation (m.4403G>A) in the gene (MTTM) that encodes tRNA(Met). The mutation was not present in accessible nonmuscle tissues from the patient or 2 asymptomatic sisters.

Conclusions: The clinical features and muscle morphology in this patient are very similar to those described in a previous patient with a different mutation, also in MTTM, which suggests that mutations in this gene confer a distinctive "dystrophic" quality. This may be a diagnostic clue in patients with isolated mitochondrial myopathy.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4107085PMC
http://dx.doi.org/10.1002/mus.24262DOI Listing

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