Abstract
BACKGROUND: Mitochondrial dysfunction due to respiratory chain impairment is a key feature in pathogenesis of Friedreich ataxia. Friedreich ataxia affects the nervous system, heart and pancreas. METHODS: We assessed hepatic mitochondrial function by (13)C-methionine-breath-test in 16 Friedreich ataxia patients and matched healthy controls. RESULTS: Patients exhaled significantly smaller amounts of (13)CO(2) over 90 minutes. Maximal exhaled percentage dose of (13)CO(2) recovery was reduced compared to controls. CONCLUSIONS: (13)C-methionine-breath-test indicates subclinical hepatic mitochondrial dysfunction in Friedreich ataxia but did not correlate with GAA repeat lengths, disease duration or disease severity.