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Mutations in PDX1, the human lipoyl-containing component X of the pyruvate dehydrogenase-complex gene on chromosome 11p1, in congenital lactic acidosis Aral B; Benelli C; Ait-Ghezala G; Amessou M; Fouque F; Maunoury C; Creau N; Kamoun P; Marsac CAm J Hum Genet 1997[Dec]; 61 (6): 1318-26We have identified and sequenced a cDNA that encodes an apparent human orthologue of a yeast protein-X component (ScPDX1) of pyruvate dehydrogenase multienzyme complexes. The new human cDNA that has been referred to as "HsPDX1" cDNA was cloned by use of the "database cloning" strategy and had a 1,506-bp open reading frame. The amino acid sequence of the protein encoded by the cDNA was 20% identical with that encoded by the yeast PDX1 gene and 40% identical with that encoded by the lipoate acetyltransferase component of the pyruvate dehydrogenase and included a lipoyl-bearing domain that is conserved in some dehydrogenase enzyme complexes. Northern blot analysis demonstrated that the major HsPDX1 mRNA was 2.5 kb in length and was expressed mainly in human skeletal and cardiac muscles but was also present, at low levels, in other tissues. FISH analysis performed with a P1-derived artificial chromosome (PAC)-containing HsPDX1 gene sublocalized the gene to 11p1.3. Molecular investigation of PDX1 deficiency in four patients with neonatal lactic acidemias revealed mutations 78del85 and 965del59 in a homozygous state, and one other patient had no PDX1 mRNA expression.|Acidosis, Lactic/congenital/*genetics[MESH]|Amino Acid Sequence[MESH]|Chromosome Mapping[MESH]|Chromosomes, Human, Pair 11/*genetics[MESH]|Cloning, Molecular[MESH]|DNA Mutational Analysis[MESH]|DNA, Complementary/genetics[MESH]|Female[MESH]|Genes[MESH]|Humans[MESH]|In Situ Hybridization, Fluorescence[MESH]|Infant, Newborn[MESH]|Male[MESH]|Molecular Sequence Data[MESH]|Muscle Proteins/biosynthesis/genetics[MESH]|Organ Specificity[MESH]|Peptides/chemical synthesis/chemistry/*genetics[MESH]|Polymerase Chain Reaction[MESH]|Protein Structure, Secondary[MESH]|Pyruvate Dehydrogenase Complex/chemical synthesis/chemistry/*genetics[MESH]|RNA, Messenger/biosynthesis/genetics[MESH]|Sequence Alignment[MESH]|Sequence Deletion[MESH]|Sequence Homology, Amino Acid[MESH] |
