d-Amino acid oxidase deficiency is caused by a large deletion in the Dao gene in LEA rats

Biochimica Et Biophysica Acta. Proteins and Proteomics
Yukiko ShimizuTadashi Okamura

Abstract

d-Amino acids, enantiomers of l-amino acids, are increasingly recognized as physiologically active molecules as well as potential biomarkers for diseases. d-Amino acid oxidase (DAO) catalyzes the oxidative deamination of d-amino acids and is present in a wide variety of organisms from yeasts to humans. Previous studies indicated that LEA rats lacked DAO activity, and levels of d-Ser and d-Ala were markedly increased in their tissues, suggesting a mutated locus responsible for the lack of Dao activity (ldao) existed in the LEA genome. Sequence analysis identified deletion breakpoints located in intron 4-5 of the Dao gene and intron 1-2 of the Svop gene, resulting in a 54.1-kb deletion which encompassed exons 5-12 of the Dao gene and exons 2-16 of the Svop gene. We developed a novel congenic rat strain, F344-Daoldao, harboring the Daoldao mutation from LEA rats delivered onto the F344 genetic background. Compared to the parental F344 strain, in F344-Daoldao rats d-Ala was markedly increased in both cerebrum and cerebellum, while d-Ser content was increased in cerebellum but not cerebrum. d-Ala, d-Ser, d-Pro and d-Leu levels were also elevated in F344-Daoldao plasma. F344-Daoldao rats represent a novel model system that will aid i...Continue Reading

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