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Infantile cardiomyopathy caused by the T14709C mutation in the mitochondrial tRNA glutamic acid gene

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A 6-week-old child presented with hypotonia, myopathy, and a rapidly worsening dilated cardiomyopathy with severe atrial and ventricular arrhythmias and pulmonary hypertension, which proved fatal at age 3 months. Biochemical analysis showed a combined deficiency of the enzymatic activities of complexes I and IV and molecular studies identified a T14709C mutation in the mitochondrial tRNA glutamic acid gene. A review of symptomatology in patients with this mutation shows that it mainly presents in childhood or young adults with mild myopathy and diabetes mellitus. Infants with a high, nearly homoplasmic mutant load can present with more severe symptoms including cardiomyopathy. Families with this mitochondrial DNA mutation should be aware that increased mutant load in a subsequent generation may result in severe and often fatal cardiac symptoms.

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mitochondrial DNA


transfer RNA


cytochrome c oxidase


adenosine triphosphate


adenosine diphosphate


restriction fragment length polymorphism


polymerase chain reaction


polyacrylamide gel electrophoresis


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The authors would like to thank Dr. Eric Shoubridge, Montreal Neurological Institute, Montreal, Canada, for performing the blue native polyacrylamide gel electrophoresis experiments.

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Correspondence to Johan L. K. Van Hove.

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Van Hove, J.L.K., Freehauf, C., Miyamoto, S. et al. Infantile cardiomyopathy caused by the T14709C mutation in the mitochondrial tRNA glutamic acid gene. Eur J Pediatr 167, 771–776 (2008).

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  • Mitochondrial respiratory chain
  • tRNA glutamic acid
  • Cardiomyopathy
  • Arrhythmias
  • Heteroplasmy