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A rare genetic mitochondrial oxidative phosphorylation disorder with characteristics of either late-onset myopathy with progressive external ophthalmoplegia and muscular weakness (predominantly limb-girdle) or early-onset myopathy presenting with decreased fetal movements, congenital ptosis, progressive external ophthalmoplegia, hypotonia and variably joint contractures. Reduced content and multiple deletions of mitochondrial DNA is observed in muscle biopsy. Caused by heterozygous mutation in the DNA2 gene on chromosome 10q.
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