Objectives. To study single nucleotide polymorphisms to investigate the possibility that urokinase is involved in the formation of urolithiasis, which, although lacking in genetic evidence, has been previously proposed. Methods. A total of 153 patients with recurrent calcium stones and 105 controls were studied. Polymerase chain reaction-based restriction analysis was used to identify the C/T polymorphism of the urokinase gene, which is mapped on the 3'-untranslated region (3'-UTR) on chromosome 10. Results. A significant difference was found in the distribution of the urokinase gene 3'-UTR C/T polymorphism frequency between patients with stones and normal controls (P <0.05). The odds ratio for the risk of the T allele in patients with stones was 3.088 (95% confidence interval 1.06 to 8.99). Conclusions. The results of our study demonstrate that the urokinase gene 3'-UTR T allele is associated with calcium stone disease. Individuals possessing the T allele have a higher incidence of calcium oxalate stone disease. The results of this study provide genetic evidence that the urokinase gene may play a role in stone formation. UROLOGY 59: 458-461, 2002. (C) 2002, Elsevier Science Inc.
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