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Duplications of mitochondrial DNA in Kearns-Sayre syndrome
J Poulton1, K J Morten, D Marchington
1Department of Paediatrics, University of Oxford, John Radcliffe Hospital, Headington, UK.
Abstract:
mtDNA duplications were detectable in 10 of 10 patients with mtDNA deletions and Kearns-Sayre syndrome (KSS) and in none of 8 patients with chronic progressive external ophthalmoplegia (CPEO). Thus, duplications of mtDNA seem to be a distinctive feature of KSS, including patients where Pearson's syndrome is the first manifestation. Diabetes mellitus was identified in 4 of 7 patients with high or moderate levels of mtDNA duplications. The balance of mtDNA rearrangements may be central to the pathogenesis of this unique group of disorders.
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