ABCG2 and hyperuricemia: A recent study demonstrated hypouricemia in a patient homozygous for the Trp258* (rs121907892) mutation in URAT1 despite being heterozygous for a variant of BCRP (ABCG2 Gln141Lys (rs2231142)) as well as homozygous for a mutation in NPT1 (SLC17A1 Thr269Ile (rs1165196)), both known to cause hyperuricemia [154].