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Point mutation of the mitochondrial tRNA(Leu) gene (A 3243 G) in maternally inherited hypertrophic cardiomyopathy, diabetes mellitus, renal failure, and sensorineural deafness.
  1. S Manouvrier,
  2. A Rötig,
  3. G Hannebique,
  4. J D Gheerbrandt,
  5. G Royer-Legrain,
  6. A Munnich,
  7. M Parent,
  8. J P Grünfeld,
  9. C Largilliere,
  10. A Lombes
  1. Service de Pédiatrie, Hôpital Huriez, Lille, France.


    The A 3243 G mutation of the mitochondrial tRNA(Leu) gene was found to segregate with maternally inherited diabetes mellitus, sensorineural deafness, hypertrophic cardiomyopathy, or renal failure in a large pedigree of 35 affected members in four generations. Presenting symptoms almost consistently involved deafness and recurrent attacks of migraine-like headaches, but the clinical course of the disease varied within and across generations. The A 3243 G mutation has been previously reported in association with the mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episode syndrome (MELAS) and with diabetes mellitus and deafness. To our knowledge, however, hypertrophic cardiomyopathy is not a common feature in people with the A 3243 G mutation and renal failure has not been hitherto reported in association with this mutation. The present observation gives additional support to the variable clinical expression of mtDNA mutations in humans.

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