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Area of Science:

  • Biochemistry
  • Genetics
  • Nephrology

Background:

  • Hypouricemia, defined as serum urate levels < 2 mg/dL, can stem from primary disorders of purine metabolism and transport.
  • Two primary genetic defects, hereditary xanthinuria and hereditary renal hypouricemia, are often overlooked in the differential diagnosis of unexplained hypouricemia.
  • Hereditary xanthinuria results from xanthine oxidase mutations, causing xanthine overproduction and stones. Hereditary renal hypouricemia involves defects in urate transporters (hURAT1/SLC22A12 or GLUT9/SLC2A9).

Purpose of the Study:

  • To highlight hereditary xanthinuria and hereditary renal hypouricemia as significant causes of unexplained hypouricemia.
  • To emphasize the diagnostic criteria for these conditions, including hypouricemia and increased fractional excretion of uric acid.
  • To report the prevalence of these conditions in specific populations, including Czech families.

Main Methods:

  • Review of genetic defects in purine metabolism and renal urate transport.
  • Analysis of diagnostic markers: serum urate levels and fractional excretion of uric acid.
  • Case identification and genetic investigation in families presenting with unexplained hypouricemia.

Main Results:

  • Hereditary xanthinuria is linked to xanthine oxidase mutations, leading to xanthine stones and potential kidney issues.
  • Hereditary renal hypouricemia involves mutations in SLC22A12 (hURAT1) or SLC2A9 (GLUT9) genes, predisposing to renal failure and nephrolithiasis.
  • Four Czech families with hereditary xanthinuria and eight cases of hereditary renal hypouricemia were identified, underscoring their under-recognition.

Conclusions:

  • Hereditary xanthinuria and hereditary renal hypouricemia are under-recognized genetic conditions.
  • Unexplained hypouricemia warrants thorough investigation into purine metabolism and renal urate transport.
  • Accurate diagnosis is essential for managing associated renal complications and genetic counseling.