Neonatal severe hyperparathyroidism, secondary hyperparathyroidism, and familial hypocalciuric hypercalcemia: multiple different phenotypes associated with an inactivating Alu insertion mutation of the calcium-sensing receptor gene.

Abstract excerpt

Neonatal severe hyperparathyroidism (NSHPT) is considered an autosomal-recessive disorder, attributable in many cases to homozygous inactivating mutations of the Ca++-sensing receptor (CASR) gene at 3q13.3-21. Most heterozygotes are clinically asymptomatic but manifest as familial (benign) hypocalciuric hypercalcemia (FHH) with a laboratory profile that is variably and sometimes only marginally different from...

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