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Related Experiment Videos

Familial benign hypocalciuric hypercalcemia.

Ghada El-Hajj Fuleihan1

  • 1Calcium Metabolism and Osteoporosis Program, American University of Beirut Medical Center, Lebanon.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|November 5, 2002
PubMed
Summary
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Familial benign hypocalciuric hypercalcemia (FBHH) is a genetic disorder caused by calcium-sensing receptor (CaSR) gene mutations. Most patients are asymptomatic and require no treatment, avoiding misdiagnosis and unnecessary surgery.

Area of Science:

  • Genetics
  • Endocrinology
  • Molecular Biology

Background:

  • Familial benign hypocalciuric hypercalcemia (FBHH) is a rare autosomal dominant disorder.
  • Characterized by benign hypercalcemia, normal PTH, and hypocalciuria, indicating partial resistance to calcium's effects.
  • Historically, FBHH was misdiagnosed as primary hyperparathyroidism, leading to inappropriate surgical intervention.

Purpose of the Study:

  • To elucidate the genetic basis and pathophysiology of FBHH.
  • To differentiate FBHH from primary hyperparathyroidism and guide clinical management.
  • To highlight the role of the calcium-sensing receptor (CaSR) in FBHH.

Main Methods:

  • Clinical, biochemical, and pathophysiological observations over decades.
  • Molecular biological studies to identify the genetic locus.

Related Experiment Videos

  • Genetic linkage analysis pinpointing chromosome 3q for the CaSR gene.

    • Main Results:

    • FBHH is predominantly linked to the calcium-sensing receptor (CaSR) gene on chromosome 3q.
    • Mutations in CaSR lead to reduced or lost receptor function in parathyroid glands and kidneys.
    • Patients are typically asymptomatic with normal longevity and no major skeletal or renal complications.

    Conclusions:

    • FBHH is primarily caused by heterozygous CaSR gene mutations, resulting in impaired calcium sensing.
    • The benign nature of FBHH necessitates reassurance and counseling against parathyroidectomy.
    • Accurate diagnosis is crucial to prevent unnecessary surgical interventions for FBHH.