Alternative titles and symbols : Xanthine dehydrogenase deficiency; Xanthine oxidase deficiency; Xdh deficiency;
Description : Xanthinuria, which was first described by Dent and Philpot (1954), is characterized
by excretion of large amounts of xanthine in the urine and a tendency to form xanthine
stones. Uric acid is strikingly diminished in serum and urine. Two clinically similar
but distinct forms of xanthinuria are recognized. In type I there is an isolated deficiency
of xanthine dehydrogenase, and in type II there is a dual deficiency of xanthine dehydrogenase
and aldehyde oxidase (603592). Type I patients can metabolize allopurinol, whereas
type II patients cannot (Simmonds et al., 1995). Xanthinuria also occurs in molybdenum
cofactor deficiency (252150).;