YDR399W HPT1 SGDID:S000002807, Chr IV from 1270068-1270733, Genome Release 64-1-1, Verified ORF, "Dimeric hypoxanthine-guanine phosphoribosyltransferase, catalyzes the formation of both inosine monophosphate and guanosine monophosphate; mutations in the human homolog HPRT1 can cause Lesch-Nyhan syndrome and Kelley-Seegmiller syndrome"