|Title||Loss-of-function mutations of SURF-1 are specifically associated with Leigh syndrome with cytochrome c oxidase deficiency.|
|Publication Type||Journal Article|
|Year of Publication||1999|
|Authors||Tiranti, V, Jaksch, M, Hofmann, S, Galimberti, C, Hoertnagel, K, Lulli, L, Freisinger, P, Bindoff, L, Gerbitz, KD, Comi, GP, Uziel, G, Zeviani, M, Meitinger, T|
|Date Published||1999 Aug|
|Keywords||Child, Preschool, Cytochrome-c Oxidase Deficiency, Electron Transport Complex IV, Female, Fibroblasts, Humans, Infant, Infant, Newborn, Leigh Disease, Male, Membrane Proteins, Mitochondrial Proteins, Muscles, Mutation, Proteins, Syndrome|
Mutations of SURF-1, a gene located on chromosome 9q34, have recently been identified in patients affected by Leigh syndrome (LS), associated with deficiency of cytochrome c oxidase (COX), the terminal component of the mitochondrial respiratory chain. To investigate to what extent SURF-1 is responsible for human disorders because of COX deficiency, we undertook sequence analysis of the SURF-1 gene in 46 unrelated patients. We analyzed 24 COX-defective patients classified as having typical Leigh syndrome (LS(COX)), 6 patients classified as Leigh-like (LL(COX)) cases, and 16 patients classified as non-LS(COX) cases. Frameshift, stop, and splice mutations of SURF-1 were detected in 18 of 24 (75%) of the LS(COX) cases. No mutations were found in the LL(COX) and non-LS(COX) group of patients. Rescue of the COX phenotype was observed in transfected cells from patients harboring SURF-1 mutations, but not in transfected cell lines from 2 patients in whom no mutations were detected by sequence analysis. Loss of function of SURF-1 protein is specifically associated with LS(COX), although a proportion of LS(COX) cases must be the result of abnormalities in genes other than SURF-1. SURF-1 is the first nuclear gene to be consistently mutated in a major category of respiratory chain defects. DNA analysis can now be used to accurately diagnose LS(COX), a common subtype of Leigh syndrome.
|Alternate Journal||Ann. Neurol.|