Two novel missense mutations in calcium-sensing receptor gene associated with neonatal severe hyperparathyroidism.

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Citation

Kobayashi M, Tanaka H, Tsuzuki K, Tsuyuki M, Igaki H, Ichinose Y, Aya K, Nishioka N, Seino Y

Two novel missense mutations in calcium-sensing receptor gene associated with neonatal severe hyperparathyroidism.

J Clin Endocrinol Metab. 1997 Aug;82(8):2716-9.

PubMed ID
9253359 [ View in PubMed
]
Abstract

Familial hypocalciuric hypercalcemia (FHH) is characterized by lifelong asymptomatic hypercalcemia without PTH hypersecretion and is inherited as an autosomal dominant trait with near 100% penetrance. In contrast, neonatal severe hyperparathyroidism (NSHPT) is a life-threatening disorder characterized by marked hypercalcemia and PTH hypersecretion. FHH/NSHPT results from inactivating mutations of the human calcium-sensing receptor (Casr) gene on chromosome 3q13.3-24. Nearly 30 different mutations of the Casr gene associated with FHH/NSHPT have been reported previously. In this report, genetic analysis of 1 Japanese NSHPT family revealed 2 novel mutations at codon 185 (CGA-->TGA/Arg-->Ter) in exon 4 of the Casr gene and at codon 670 (GGG-->GAG/Gly-->Glu) in exon 7. The Arg185Ter change was shown to occur in the proband's unaffected father and paternal grandmother as well as in the proband. The other mutation in exon 7 was shown in the proband's unaffected mother of Philippine origin as well as in the proband. This family is the first case of manifestation of more than 1 mutation in a proband's chromosomes; 1 mutation was obtained from the unaffected father, and the other was from the unaffected mother. Our observations have given us important keys to help elucidate the structure-function relationships of the Casr.

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Polypeptides
NameUniProt ID
Extracellular calcium-sensing receptorP41180Details