Mitochondrial myopathy and respiratory failure associated with a new mutation in the mitochondrial transfer ribonucleic acid glutamic acid gene.
We report a novel T14687C mutation in the mitochondrial transfer ribonucleic acid glutamic acid gene in a 16-year-old boy with myopathy and lactic acidosis, retinopathy, and progressive respiratory failure leading to death. A muscle biopsy showed cytochrome c oxidase-negative ragged-red fibers, and biochemical analysis of the respiratory chain enzymes in muscle homogenate revealed complex I and complex IV deficiencies. The mutation, which affects the trinucleotide (TpsiC) loop, was nearly homoplasmic in the muscle DNA of the proband, but it was absent in his blood and in the blood from the asymptomatic mother, suggesting that it may have been a spontaneous somatic mutation in muscle.
Bruno
Claudio
C
Department of Pediatrics, University of Genova, Italy. claudiobruno@ospedale-gaslini.ge.it
Sacco
Oliviero
O
Santorelli
Filippo M
FM
Assereto
Stefania
S
Tonoli
Emmanuel
E
Bado
Massimo
M
Rossi
Giovanni A
GA
Minetti
Carlo
C
D000293:Adolescent; D006801:Humans; D008297:Male; D008928:Mitochondria / Q000235:genetics* / Q000473:pathology; D017240:Mitochondrial Myopathies / Q000235:genetics* / Q000473:pathology; D009154:Mutation / Q000235:genetics*; D012346:RNA, Transfer, Amino Acyl / Q000235:genetics*; D012131:Respiratory Insufficiency / Q000235:genetics* / Q000473:pathology
D012346:RNA, Transfer, Amino Acyl