Abstract
The FoF1-ATPase, a multisubunit protein complex of the inner mitochondrial membrane, produces most of the ATP in mammalian cells. Mitochondrial diseases as a result of a dysfunction of ATPase can be caused by mutations in mitochondrial DNA–encoded ATPase subunit a or rarely by an ATPase defect of nuclear origin. Here we present a detailed functional and immunochemical analysis of a new case of selective and generalized ATPase deficiency found in an Austrian patient. The defect manifested with developmental delay, muscle hypotonia, failure to thrive, ptosis, and varying lactic acidemia (up to 12 mmol/L) beginning from the neonatal period. A low-degree dilated cardiomyopathy of the left ventricle developed between the age of 1 and 2 y. A >90% decrease in oligomycin-sensitive ATPase activity and an 86% decrease in the content of the ATPase complex was found in muscle mitochondria. It was associated with a significant decrease of ADP-stimulated respiration of succinate (1.5-fold) and respiratory control with ADP (1.7-fold) in permeabilized muscle fibers, and with a slight decrease of the respiratory chain complex I and compensatory increase in the content of complexes III and IV. The same ATPase deficiency without an increase in respiratory chain complexes was found in fibroblasts, suggesting a generalized defect with tissue-specific manifestation. Absence of any mutations in mitochondrial ATP6 and ATP8 genes indicates a nuclear origin of the defect.
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Abbreviations
- BN-PAGE:
-
Blue-Native PAGE
- DDM:
-
dodecyl maltoside
- FCCP:
-
carbonyl cyanide 4-triflouromethoxy-phenylhydrazone
- mtDNA:
-
mitochondrial DNA
- OXPHOS:
-
oxidative phosphorylation
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This work was supported by bilateral Czech-Austrian Grant KONTAKT 2001-20, Grant Agency of Ministry of Health of the Czech Republic (NE 6533-3), institutional projects (AVOZ5011922, VZ 111100003), and the Jubiläumsfond of the Oesterreichische Nationalbank (no. 8314).
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Mayr, J., Paul, J., Pecina, P. et al. Reduced Respiratory Control with ADP and Changed Pattern of Respiratory Chain Enzymes as a Result of Selective Deficiency of the Mitochondrial ATP Synthase. Pediatr Res 55, 988–994 (2004). https://doi.org/10.1203/01.pdr.0000127016.67809.6b
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DOI: https://doi.org/10.1203/01.pdr.0000127016.67809.6b
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