title: An mtDNA mutation, 14453G-->A, in the NADH dehydrogenase subunit 6 associated with severe MELAS syndrome.
abstract: We report a novel point mutation in the gene for the mitochondrially encoded ND6 subunit of the NADH:ubiquinone oxidoreductase (complex I of the respiratory chain) in a patient with MELAS syndrome. The mutation causes a change from alanine to valine in the most conserved region of the ND6 subunit. The patient was heteroplasmic for the mutation in both muscle and blood, but the mutation was not detected in the patient's mother. A marked reduction of complex I activity was found in the patient's muscular tissue. This is the first report of a mutation in the ND6 subunit causing MELAS. Our data confirm the genetic heterogeneity in mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes syndrome, and confirms that MELAS can be caused by mutation in polypeptide-coding mtDNA genes.
authors.affiliation: Department of Clinical Genetics, University Hospital, Rigshospitalet, Copenhagen, Denmark.
authors.forename: K
authors.initials: K
authors.lastname: Ravn
authors.forename: F
authors.initials: F
authors.lastname: Wibrand
authors.forename: F J
authors.initials: FJ
authors.lastname: Hansen
authors.forename: N
authors.initials: N
authors.lastname: Horn
authors.forename: T
authors.initials: T
authors.lastname: Rosenberg
authors.forename: M
authors.initials: M
authors.lastname: Schwartz
mesh_terms: D001483:Base Sequence; D002675:Child, Preschool; D004252:DNA Mutational Analysis; D004272:DNA, Mitochondrial / Q000097:blood / Q000235:genetics*; D005260:Female; D006801:Humans; D017241:MELAS Syndrome / Q000097:blood / Q000201:enzymology* / Q000235:genetics*; D008931:Mitochondria, Muscle / Q000201:enzymology; D009154:Mutation / Q000235:genetics*; D009245:NADH Dehydrogenase / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D021122:Protein Subunits; D015183:Restriction Mapping
chemical_list: D004272:DNA, Mitochondrial; D021122:Protein Subunits; D009245:NADH Dehydrogenase