Non-urate transporter 1-related renal hypouricemia and acute renal failure in an Israeli–Arab family

Abstract

Idiopathic renal hypouricemia (IRHU) is a rare hereditary disease, predisposing the individual to exercise-induced acute renal failure (EIARF) and nephrolithiasis, and it is characterized by increased clearance of renal uric acid. Most of the described patients are Japanese, who have loss-of-function mutations in the SLC22A12 gene coding for the human urate transporter 1 (URAT1) gene. An 18-year-old youth, who was admitted for EIARF due to IRHU, and six consanguineous Israeli–Arab family members were included in the study. The family members were tested for fractional excretion of uric acid and molecular analysis of the URAT1 gene. Four family members, including the proband, had very low levels of blood uric acid and high rate of fractional excretion (FE urate> 100%) of uric acid. Genetic analysis of the affected family members did not reveal a mutation in the coding regions and intron–exon boundaries of SCL22A12. Haplotype analysis excluded SCL22A12 involvement in the pathogenesis, suggesting a different gene as a cause of the disease. We herein describe the first Israeli–Arab family with IRHU. A non-URAT1 genetic defect that causes decreased reabsorption or, more probably, increased secretion of uric acid, induces IRHU. Further studies are required in order to elucidate the genetic defect.

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The authors declare that they had no support and have no financial disclosure.

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Correspondence to Michael Goldman.

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Hilla Bahat and Dganit Dinour contributed equally to the work.

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Bahat, H., Dinour, D., Ganon, L. et al. Non-urate transporter 1-related renal hypouricemia and acute renal failure in an Israeli–Arab family. Pediatr Nephrol 24, 999–1003 (2009). https://doi.org/10.1007/s00467-008-1093-6

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Keywords

  • Idiopathic renal hypouricemia
  • Exercise-induced acute renal failure
  • Gene analysis
  • SLC22A12
  • Human urate transporter 1