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.
journal_name
J Med Genetjournal_title
Journal of medical geneticsauthors
Bénit P,Slama A,Cartault F,Giurgea I,Chretien D,Lebon S,Marsac C,Munnich A,Rötig A,Rustin Pdoi
10.1136/jmg.2003.014316keywords:
subject
Has Abstractpub_date
2004-01-01 00:00:00pages
14-7issue
1eissn
0022-2593issn
1468-6244journal_volume
41pub_type
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