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Lookup NU author(s): Professor Rita HorvathORCiD, Dr Helen Tuppen, Professor Gavin Hudson, Dr Angela Pyle, Dr Paul Smith, Professor Bobby McFarlandORCiD, Professor Zofia Chrzanowska-LightowlersORCiD, Professor Robert Lightowlers, Professor Hanns Lochmuller, Professor Robert Taylor, Professor Patrick Chinnery
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Childhood-onset mitochondrial encephalomyopathies are usually severe, relentlessly progressive conditions that have a fatal outcome. However, a puzzling infantile disorder, long known as 'benign cytochrome c oxidase deficiency myopathy' is an exception because it shows spontaneous recovery if infants survive the first months of life. Current investigations cannot distinguish those with a good prognosis from those with terminal disease, making it very difficult to decide when to continue intensive supportive care. Here we define the principal molecular basis of the disorder by identifying a maternally inherited, homoplasmic m.14674T > C mt-tRNA(Glu) mutation in 17 patients from 12 families. Our results provide functional evidence for the pathogenicity of the mutation and show that tissue-specific mechanisms downstream of tRNA(Glu) may explain the spontaneous recovery. This study provides the rationale for a simple genetic test to identify infants with mitochondrial myopathy and good prognosis.
Author(s): Horvath R, Kemp JP, Tuppen HAL, Hudson G, Oldfors A, Marie SKN, Moslemi AR, Servidei S, Holme E, Shanske S, Kollberg G, Jayakar P, Pyle A, Marks HM, Holinski-Feder E, Scavina M, Walter MC, Coku J, Gunther-Scholz A, Smith PM, McFarland R, Chrzanowska-Lightowlers ZMA, Lightowlers RN, Hirano M, Lochmuller H, Taylor RW, Chinnery PF, Tulinius M, DiMauro S
Publication type: Article
Publication status: Published
Journal: Brain
Year: 2009
Volume: 132
Issue: 11
Pages: 3165-3174
ISSN (print): 0006-8950
ISSN (electronic): 1460-2156
Publisher: Oxford University Press
URL: http://dx.doi.org/10.1093/brain/awp221
DOI: 10.1093/brain/awp221
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