Phosphoribosylpyrophosphate (PRPP) synthetase superactivity is an X-linked disorder of purine metabolism associated with hyperuricemia and hyperuricosuria, comprised of two forms: an early-onset severe form characterized by gout, urolithiasis, and neurodevelopmental anomalies (severe PRPP synthetase superactivity) and a mild late-onset form with no neurologic involvement (mild PRPP synthetase superactivity). The disease is phosphoribosylpyrophosphate synthetase superactivity (Monarch Disease Ontology id MONDO_0010395). Also known as: PRPP synthetase superactivity, PRPS1 superactivity, gout, PRPS-related, X-linked recessive, phosphoribosylpyrophosphate synthetase superactivity, X-linked recessive.