Journal of Inherited Metabolic Disease 1989
Cytochrome c oxidase deficiency in subacute necrotizing encephalopathy (Leigh syndrome).
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Tissues and cultured fibroblasts from two patients with Leigh syndrome (subacute necrotizing encephalopathy) were examined. A systemic defect in cytochrome oxidase was identified by enzyme assay and estimation of cytochrome concentrations. Immunochemical analysis showed a reduction of most subunits of the cytochrome oxidase complex. The rate of synthesis of cytochrome oxidase subunits, determined by labelling experiments in cultured fibroblasts, was the same in the patients and normal controls. The reduced cytochrome oxidase content of the patients' tissues must therefore result from abnormal turnover of the protein subunits.