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CASE REPORTS
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Two novel missense mutations in calcium-sensing receptor gene associated with neonatal severe hyperparathyroidism.
Journal of Clinical Endocrinology and Metabolism 1997 August
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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