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Hereditary hypophosphatemic rickets with hypercalciuria: report of a new kindred

I Sermet-Gaudelus1, M Garabédian, M Dechaux

  • 1Pediatric Department, Hôpital Necker-Enfants Malades, Paris, France. sermet-gaudelus@necker.fr

Nephron
|May 8, 2001
PubMed

Insights

A new family with hereditary hypophosphatemic rickets with hypercalciuria shows increased phosphate loss and high calcium absorption. This suggests a distinct tubular defect affecting phosphate transport, distinct from vitamin D deficiency.

Area of Science:

  • Nephrology
  • Endocrinology
  • Genetics

Background:

  • Hereditary hypophosphatemic rickets with hypercalciuria (HHRH) is a rare genetic disorder.
  • It is characterized by renal phosphate wasting, hypophosphatemia, and hypercalciuria.

Observation:

  • A novel kindred with HHRH presented with a symptomatic child and affected relatives.
  • Key biochemical findings included increased renal phosphate clearance, hypophosphatemia, and hyperabsorptive hypercalciuria.
  • Low parathyroid hormone (PTH) and elevated 1,25-dihydroxyvitamin D (1,25-(OH)2D) serum levels were also noted.

Findings:

  • The observed pattern, particularly the association with vitamin D deficiency and normal urinary cyclic AMP excretion, points towards a unique tubular defect in phosphate transport.
  • This challenges simple explanations based solely on vitamin D metabolism or PTH function.

Implications:

  • This discovery expands the known spectrum of HHRH and its genetic underpinnings.
  • Identifying this novel tubular defect may lead to more targeted diagnostic approaches and therapeutic strategies for patients with HHRH.
  • Further research is warranted to elucidate the specific molecular mechanisms involved in this distinct form of phosphate wasting.

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