A 34-year-old man affected by exercise intolerance, mild proximal weakness and severe lactic acidosis is described. Muscle biopsy revealed mitochondrial abnormalities and an increase of cytochrome c oxidase histochemical reaction. Biochemical investigations on isolated muscle mitochondria as well as polarographic studies revealed a mitochondrial NADH-CoQ reductase (complex I) deficiency. Mitochondrial dysfunction was confirmed by 31P nuclear magnetic resonance spectroscopy. Immunological investigation showed a generalized reduction of all complex I polypeptides. Genetic analysis did not reveal mitochondrial DNA deletions. The biochemical defect was not present in the patient's muscle tissue culture. Metabolic measurements and functional evaluation showed a reduced mechanical efficiency during exercise.
A CASE OF MITOCHONDRIAL MYOPATHY, LACTIC-ACIDOSIS AND COMPLEX-I DEFICIENCY / L. BET, N. BRESOLIN, M. MOGGIO, G. MEOLA, A. PRELLE, A. SCHAPIRA, T. BINZONI, A. CHOMYN, F. FORTUNATO, P. CERRETELLI, G. SCARLATO. - In: JOURNAL OF NEUROLOGY. - ISSN 0340-5354. - 237:7(1990), pp. 399-404. [10.1007/BF00314729]
A CASE OF MITOCHONDRIAL MYOPATHY, LACTIC-ACIDOSIS AND COMPLEX-I DEFICIENCY
L. BetPrimo
;N. BresolinSecondo
;G. Meola;F. Fortunato;
1990
Abstract
A 34-year-old man affected by exercise intolerance, mild proximal weakness and severe lactic acidosis is described. Muscle biopsy revealed mitochondrial abnormalities and an increase of cytochrome c oxidase histochemical reaction. Biochemical investigations on isolated muscle mitochondria as well as polarographic studies revealed a mitochondrial NADH-CoQ reductase (complex I) deficiency. Mitochondrial dysfunction was confirmed by 31P nuclear magnetic resonance spectroscopy. Immunological investigation showed a generalized reduction of all complex I polypeptides. Genetic analysis did not reveal mitochondrial DNA deletions. The biochemical defect was not present in the patient's muscle tissue culture. Metabolic measurements and functional evaluation showed a reduced mechanical efficiency during exercise.
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