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Stones, bones, and heredity.

Dawn S Milliner1

  • 1Division of Nephrology, Mayo Clinic Hyperoxaluria Centre, Mayo Clinic College of Medicine, Rochester, Minnisota 55905, USA. milliner.dawn@mayo.edu

Acta Paediatrica (Oslo, Norway : 1992). Supplement
|June 28, 2006
PubMed
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Genetic disorders like Dent's disease and primary hyperoxaluria cause kidney stones and disease. Molecular medicine aids diagnosis and promises better treatments for these rare mineral metabolism conditions.

Area of Science:

  • Nephrology
  • Medical Genetics
  • Molecular Medicine

Background:

  • Genetic disorders of mineral metabolism can lead to urolithiasis, renal disease, and osteodystrophy.
  • Diagnosing these rare conditions is challenging due to overlapping clinical features and the difficulty in observing the full spectrum of disease.
  • Dent's disease and primary hyperoxaluria are inherited causes of calcium urolithiasis with shared symptoms like nephrocalcinosis and early-onset renal failure.

Observation:

  • Dent's disease results from CLCN-5 gene mutations, impairing chloride channel function and causing hypercalciuria and phosphate wasting.
  • Primary hyperoxaluria type I is caused by AGXT gene mutations, leading to deficient alanine-glyoxylate aminotransferase activity and oxalate overproduction.
  • Both conditions present with nephrocalcinosis and urolithiasis in childhood, and renal failure can occur at any age.

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Findings:

  • Low-molecular-weight proteinuria is a characteristic finding in Dent's disease.
  • Definitive diagnosis for Dent's disease is achieved through DNA mutation analysis.
  • Primary hyperoxaluria diagnosis involves liver biopsy to measure enzyme activity, with DNA analysis becoming increasingly utilized.

Implications:

  • These genetic disorders highlight the critical role of molecular medicine in accurate diagnosis.
  • Understanding the genetic basis offers potential for developing targeted and more effective therapeutic strategies.
  • Advances in molecular diagnostics pave the way for innovative treatments for rare inherited kidney stone diseases.