Risk of developing a mitochondrial DNA deletion disorder

Patrick F. Chinnery, Prof Salvatore Dimauro, Sara Shanske, Prof Eric A Schon, Massimo Zeviani, Caterina Mariotti, Fanco Carrara, Anne Lombes, Pascal Laforet, Helène Ogier, Michaela Jaksch, Hanns Lochmüller, Rita Horvath, Marcus Deschauer, David R. Thorburn, Prof Laurence A Bindoff, Prof Joanna Poulton, Robert W. Taylor, Prof John N S Matthews, Prof Douglass M Turnbull

Research output: Contribution to journalArticlepeer-review


Background Pathogenic mitochondrial DNA (mtDNA) mutations are found in at least one in 8000 individuals. No effective treatment for mtDNA disorders is available, making disease prevention important. Many patients with mtDNA disease harbour a single pathogenic mtDNA deletion, but the risk factors for new cases and disease recurrence are not known. Methods We did a multicentre study of 226 families in which a single mtDNA deletion had been identified in the proband, including patients with chronic progressive external ophthalmoplegia, Kearns Sayre syndrome, or Pearson's syndrome. We studied the relation between maternal age and the risk of unaffected mothers having an affected child, and determined the recurrence risks among the siblings and offspring of affected individuals. Findings We noted no relation between maternal age and the risk of unaffected mothers having children with an mtDNA deletion disorder. None of the 251 siblings of the index cases developed clinical features of mtDNA disease. Risk of recurrence among the offspring of affected women was 4·11% (95% CI 0·86-11·54, or one in 117 to one in nine births). Only one of the mothers who had an affected child had a duplication of mtDNA in skeletal muscle. Interpretation Unlike nuclear chromosomal rearrangements, incidence of mtDNA deletion disorders does not increase with maternal age, and unaffected mothers are unlikely to have more than one affected child. Affected women were previously thought to have a negligible chance of having clinically affected offspring, but the actual risk is, on average, about one in 24 births.

Original languageEnglish
Pages (from-to)592-596
Number of pages5
Issue number9434
Publication statusPublished - Aug 14 2004

ASJC Scopus subject areas

  • Medicine(all)


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