The T9176G mtDNA mutation severely affects ATP production and results in Leigh syndrome

The authors identified a novel mtDNA mutation (T9176G) in the ATPase 6 gene in a family in which a 10-year-old girl had a severe neurodegenerative dis order, her elder sister had died of Leigh syn drome (LS), and a maternal un cle had a spinocerebellar disorder. Biochemical studies disclosed a reduced rate of ATP synthesis in skin fibroblast cultures from the proposita as th e likely explanation of her severe illness. The findings expand the genetic variants associated with LS.