Mutations in structural genes of complex I associated with neurological diseases.
This paper summarizes observations on the genetic and biochemical basis of hereditary defects of complex I (NADH-ubiquinone oxidoreductase) of the respiratory chain in human neurological patients. Two different types of functional defects of the complex are described. In one type mutations in the NDUFS1 and NDUFS4 nuclear structural genes of the complex were identified in two unrelated families. Both NDUFS1 and NDUFS4 neurological disorders were transmitted by autosomic recessive inheritance. The two mutations resulted in different impact on cellular metabolism. The NDUFS4 mutation, giving a more severe, fatal pathological pattern, resulted in a defective assembly of the complex and complete suppression of the enzymatic activity. The NDUFS1 mutation, with less severe progressive pathology, caused only partial inhibition of the complex but enhanced production of oxygen free radicals. In the second type of deficiencies extensive mutational analysis did not reveal pathogenic mutations in complex I genes but a decline in the level and activity of complex I, III, and IV were found, apparently associated with alteration in the cardiolipin membrane distribution.
Scacco
Salvatore
S
Department of Medical Biochemistry, Biology and Physics, University of Bari, Italy.
Petruzzella
Vittoria
V
Bertini
Enrico
E
Luso
Arcangela
A
Papa
Francesco
F
Bellomo
Francesco
F
Signorile
Anna
A
Torraco
Alessandra
A
Papa
Sergio
S
D000328:Adult; D002648:Child; D042967:Electron Transport Complex I / Q000172:deficiency / Q000235:genetics*; D005260:Female; D020271:Heredodegenerative Disorders, Nervous System / Q000235:genetics*; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism; D008297:Male; D009245:NADH Dehydrogenase / Q000235:genetics; D013481:Superoxides / Q000378:metabolism
C487793:NDUFS1 protein, human; D013481:Superoxides; D006861:Hydrogen Peroxide; D009245:NADH Dehydrogenase; D042967:Electron Transport Complex I; C427643:NDUFS4 protein, human