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J Med Genet. 2004 Jan;41(1):14-7.

Mutant NDUFS3 subunit of mitochondrial complex I causes Leigh syndrome.

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1
Unité de Recherche sur les Handicaps Génétiques de l'Enfant (INSERM U393) and Département de Génétique, Hôpital Necker-Enfants Malades, Paris Cedex 15, France.

Abstract

Respiratory chain complex I deficiency represents a genetically heterogeneous group of diseases resulting from mutations in mitochondrial or nuclear genes. Mutations have been reported in 13 of the 14 subunits encoding the core of complex I (seven mitochondrial and six nuclear genes) and these result in Leigh or Leigh-like syndromes or cardiomyopathy. In this study, a combination of denaturing high performance liquid chromatography and sequence analysis was used to study the NDUFS3 gene in a series of complex I deficient patients. Mutations found in this gene (NADH dehydrogenase iron-sulphur protein 3), coding for the seventh and last subunit of complex I core, were shown to cause late onset Leigh syndrome, optic atrophy, and complex I deficiency. A biochemical diagnosis of complex I deficiency on cultured amniocytes from a later pregnancy was confirmed through the identification of disease causing NDUFS3 mutations in these cells. While mutations in the NDUFS3 gene thus result in Leigh syndrome, a dissimilar clinical phenotype is observed in mutations in the NDUFV2 and NDUFS2 genes, resulting in encephalomyopathy and cardiomyopathy. The reasons for these differences are uncertain.

PMID:
14729820
PMCID:
PMC1757256
[Indexed for MEDLINE]
Free PMC Article
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