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Lactic acidosis and developmental delay due to deficiency of E3 binding protein (protein X) of the pyruvate dehydrogenase complex
Author(s) -
Ramadan D. G.,
Head R. A.,
AlTawari A.,
Habeeb Y.,
Zaki M.,
AlRuqum F.,
Besley G. T. N.,
Wraith J. E.,
Brown R. M.,
Brown G. K.
Publication year - 2004
Publication title -
journal of inherited metabolic disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 102
eISSN - 1573-2665
pISSN - 0141-8955
DOI - 10.1023/b:boli.0000037336.91549.44
Subject(s) - pyruvate dehydrogenase complex , lactic acidosis , biology , nonsense mutation , protein subunit , biochemistry , glutamine , gene , microbiology and biotechnology , mutation , enzyme , amino acid , missense mutation
Summary: Pyruvate dehydrogenase deficiency is an important cause of primary lactic acidosis. Most cases occur as a result of mutations in the gene for the E1α subunit of the complex, with a small number resulting from mutations in genes for other components, most commonly the E3 and E3‐binding protein subunits. We describe pyruvate dehydrogenase E3‐binding protein deficiency in two siblings in each of two unrelated families from Kuwait. The index patient in each family had reduced pyruvate dehydrogenase activity in cultured fibroblasts and no detectable immunoreactive E3‐binding protein. Both were homozygous for nonsense mutations in the E3‐binding protein gene, one involving the codon for glutamine 266, the other the codon for tryptophan 5.