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Familial hypercalcemia and hypercalciuria: no mutations in the Ca2+-sensing receptor gene

J Rodríguez-Soriano1, A Vallo, M J Quintela

  • 1Department of Pediatrics, Hospital de Cruces and Basque University School of Medicine, Bilbao, País Vasco, Spain. jrs00014@teleline.es

Pediatric Nephrology (Berlin, Germany)
|August 21, 2001
PubMed

Insights

This study investigates a familial case of persistent hypercalcemia and hypercalciuria. Despite normal parathyroid hormone (PTH) levels, the calcium-sensing receptor (CaR) gene showed no mutations, suggesting a functional CaR abnormality.

Area of Science:

  • Nephrology
  • Endocrinology
  • Human Genetics

Background:

  • Familial hypercalcemia and hypercalciuria are conditions characterized by elevated calcium levels in the blood and urine.
  • Persistent hypercalcemia and hypercalciuria can lead to serious complications like nephrocalcinosis.

Observation:

  • A 6-year-old boy presented with persistent hypercalcemia, hypercalciuria, and nephrocalcinosis since infancy.
  • His father, aged 40, exhibited similar symptoms of hypercalcemia and hypercalciuria.
  • Serum intact parathyroid hormone (PTH) levels were normal in both affected individuals.

Findings:

  • The clinical presentation suggested a potential functional abnormality of the calcium-sensing receptor (CaR).
  • Genetic analysis revealed no mutations in the coding regions of the CaR gene in the affected individuals.
  • This indicates a possible non-coding region mutation or other regulatory mechanism affecting CaR function.

Implications:

  • This case highlights the complexity of calcium homeostasis disorders.
  • It suggests that functional CaR abnormalities, even without detectable coding mutations, can cause significant clinical manifestations.
  • Further research into CaR gene regulation and non-coding variants is warranted for improved diagnosis and management of familial hypercalcemia.

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