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Near-Identical Segregation of mtDNA Heteroplasmy in Blood, Muscle, Urinary Epithelium, and Hair Follicles in Twins With Optic Atrophy, Ptosis, and Intractable Epilepsy

Lookup NU author(s): Professor Rita Horvath, Dr Charlotte Alston, Dr Patrick Yu Wai Man, Dr Langping He, Professor Robert Taylor, Professor Patrick Chinnery

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Abstract

IMPORTANCE Mitochondrial DNA (mtDNA) disorders have emerged as major causes of inherited neurologic disease. Despite being well recognized for more than 2 decades, the clinical presentation continues to broaden. The phenotypic heterogeneity is partly owing to different percentage levels of mutant mtDNA heteroplasmy in different tissues, but the factors influencing this are poorly understood. OBSERVATIONS This case report describes monozygotic male twins with ptosis, optic atrophy, and recent-onset intractable myoclonic epilepsy. The assessment of respiratory chain enzyme activities in the muscle from 1 twin revealed a severe and isolated defect involving mitochondrial complex I. Mitochondrial DNA sequencing revealed a pathogenic m.14487T>C MTND6 mutation, which was present at very high levels of heteroplasmy in muscle (84%) and lower levels in blood (15%), urinary epithelium (75%), and buccal mucosa (58%). Of particular interest, his identical twin was found to harbor very similar levels of the m. 14487T>C mutation in his blood, urine, buccal mucosa, and hair follicle DNA samples, while the presence of low levels in the mother's tissues confirmed maternal transmission. CONCLUSIONS AND RELEVANCE It was shown that m14487T>C can also cause the unusual combination of optic atrophy, ptosis, and encephalomyopathy leading to intractable seizures. Near-identical heteroplasmy levels in different tissues in both siblings support a nuclear genetic mechanism controlling the tissue segregation of mtDNA mutations.


Publication metadata

Author(s): Spyropoulos A, Manford M, Horvath R, Alston CL, Yu-Wai-Man P, He LP, Taylor RW, Chinnery PF

Publication type: Article

Publication status: Published

Journal: JAMA Neurology

Year: 2013

Volume: 70

Issue: 12

Pages: 1552-1555

Print publication date: 01/12/2013

ISSN (print): 2168-6149

ISSN (electronic): 2168-6157

Publisher: American Medical Association

URL: http://dx.doi.org/10.1001/jamaneurol.2013.4111

DOI: 10.1001/jamaneurol.2013.4111


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