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Diagnostic tests for primary renal hypouricemia.

Ivan Sebesta1, Blanka Stiburkova, Josef Bartl

  • 1Institute of Inherited Metabolic Disorders, First Faculty of Medicine, Charles University, Prague, Czech Republic. isebes@lf1.cuni.cz

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Summary
This summary is machine-generated.

Primary renal hypouricemia, a genetic disorder affecting uric acid reabsorption, is caused by defects in the SLC22A12 (hURAT1) and SLC2A9 (URATv1) genes. This study identified novel mutations in these genes in Czech and UK patients, highlighting their role in serum urate regulation.

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Area of Science:

  • Genetics
  • Nephrology
  • Biochemistry

Background:

  • Primary renal hypouricemia is a genetic disorder characterized by impaired renal uric acid reabsorption, leading to hypouricemia and potential complications like nephrolithiasis and acute renal failure.
  • Known genetic causes include mutations in SLC22A12 (hURAT1) and SLC2A9 (URATv1) genes, though hURAT1 mutations were previously reported only in East Asian populations.
  • Diagnosis relies on low serum uric acid levels and increased fractional excretion of uric acid, but the condition can be overlooked.

Purpose of the Study:

  • To investigate the genetic basis of primary renal hypouricemia in Czech and UK populations.
  • To identify novel mutations in the SLC22A12 and SLC2A9 genes associated with the disorder.
  • To further elucidate the role of hURAT1 and URATv1 in serum urate homeostasis.

Main Methods:

  • Molecular analysis of SLC22A12 and SLC2A9 genes in 620 hypouricemic Czech patients after excluding secondary causes.
  • Genetic analysis of two UK patients with acute renal failure.
  • Estimation of serum uric acid levels and fractional excretion of uric acid.

Main Results:

  • Four mutations (three transitions, one deletion) in the SLC22A12 gene and one insertion in the SLC2A9 gene were identified in seven Czech patients.
  • Three of these Czech patients experienced acute renal failure and urate nephrolithiasis.
  • Sequence variants in SLC22A12 and SLC2A9 genes were also found in two UK patients with acute renal failure.

Conclusions:

  • The study provides further evidence that defects in SLC22A12 and SLC2A9 genes are causative for primary renal hypouricemia.
  • These findings expand the geographical distribution of known mutations and identify new variants.
  • The identified gene defects underscore the critical role of hURAT1 and URATv1 in regulating serum urate levels in humans.