Dihydropyrimidinase Deficiency, also known as dihydropyrimidinuria, is related to dihydropyrimidine dehydrogenase deficiency and purine-pyrimidine metabolic disorder. An important gene associated with Dihydropyrimidinase Deficiency is DPYS (Dihydropyrimidinase), and among its related pathways/superpathways are Metabolism and Metabolism of nucleotides. Affiliated tissues include small intestine, and related phenotypes are abnormal pyramidal sign and delayed speech and language development