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A novel mitochondrial DNA tRNAIle (A4267G) mutation in a sporadic patient with mitochondrial myopathy

Lookup NU author(s): Professor Robert Taylor, Dr Andrew Schaefer, Professor Bobby McFarlandORCiD, Emeritus Professor Doug Turnbull


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We describe a novel mutation in the mitochondrial tRNAIle gene, an A to G transition at nucleotide position 4267, in a 37-year-old woman with myopathy, ataxia and sensorineural hearing loss. The A4267G mutation was heteroplasmic in several of the proband's tissues and single fibre analysis revealed significantly higher levels of mutated mitochondrial DNA in cytochrome c oxidase-deficient fibres than cytochrome c oxidase-positive fibres. It is predicted to disrupt a highly conserved base pair within the aminoacyl acceptor stem of the tRNA causing functional impairment, and as such fulfils all the accepted criteria for pathogenicity. Moreover, we were unable to detect the A4267G mutation in lymphocytes, buccal epithelia and hair of the patient's mother and two siblings, implying that the A4267G transition represents a sporadic, germline mutation. © 2002 Elsevier Science B.V. All rights reserved.

Publication metadata

Author(s): McFarland R; Taylor RW; Schaefer AM; Turnbull DM; Maddison P

Publication type: Article

Publication status: Published

Journal: Neuromuscular Disorders

Year: 2002

Volume: 12

Issue: 7-8

Pages: 659-664

ISSN (print): 0960-8966

ISSN (electronic): 1873-2364

Publisher: Elsevier


DOI: 10.1016/S0960-8966(02)00026-3

PubMed id: 12207935


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