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- W2019989190 abstract "Deleted mitochondrial DNA (mtDNA) has been shown to coexist with normal mtDNA (heteroplasmy) in muscles from chronic progressive external ophthalmoplegia, including Kearns-Sayre syndrome. In this study, we correlated heteroplasmic mtDNA abnormality with clinical, biochemical and histological findings with the following results: (1) large deletions ranging from 1.8 to 8.8 kb in 22 muscle specimens from 28 patients who had ophthalmoplegia clinically and focal cytochromec oxidase (CCO) deficiency by histochemistry, (2) no difference in clinical and biochemical findings between patients with and without mtDNA deletions, (3) no relationship between the size, site or populations of deleted mtDNA and respiratory chain enzyme activities in muscles, (4) positive correlation between the number of CCO-deficient fibers and the populations of deleted mtDNA, and (5) higher incidence of CCO-negative fibers in patients with deleted mtDNA than in those with no deletion of mtDNA. These results suggest that deleted mtDNA is, at least in part, responsible for focal CCO deficiency as a phenotypic expression and that the investigation on pathogenetic mechanism of focal CCO deficiency may provide a clue to understanding the underlying pathophysiology in this disorder." @default.
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- W2019989190 date "1990-12-01" @default.
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- W2019989190 title "Chronic progressive external ophthalmoplegia: A correlative study of mitochondrial DNA deletions and their phenotypic expression in muscle biopsies" @default.
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- W2019989190 doi "https://doi.org/10.1016/0022-510x(90)90014-e" @default.
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