SLC22A12 and hyperuricemia: Methods: A total of 860 Mexicans (129 cases and 731 controls) between 18 and 25 years of age were genotyped for theABCG2 (Q191K), SLC22A12 (517G>A), and XDH (518T>C) polymorphisms, as predisposing factors of hyperuricemia.