Dershem, Ridge, Gorvin, Caroline M, Metpally, Raghu PR, Krishnamurthy, Sarathbabu, Smelser, Diane T, Hannan, Fadil M 
ORCID: 0000-0002-2975-5170, Carey, David J, Thakker, Rajesh V and Breitwieser, Gerda E
(2020)
Familial Hypocalciuric Hypercalcemia Type 1 and Autosomal-Dominant Hypocalcemia Type 1: Prevalence in a Large Healthcare Population.
AMERICAN JOURNAL OF HUMAN GENETICS, 106 (6).
pp. 734-747.
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Familial Hypocalciuric Hypercalcemia Type 1 and Autosomal-Dominant Hypocalcemia Type 1 Prevalence in a Large Healthcare Popu.pdf - Published version Download (1MB) | Preview |
Abstract
The calcium-sensing receptor (CaSR) regulates serum calcium concentrations. CASR loss- or gain-of-function mutations cause familial hypocalciuric hypercalcemia type 1 (FHH1) or autosomal-dominant hypocalcemia type 1 (ADH1), respectively, but the population prevalence of FHH1 or ADH1 is unknown. Rare CASR variants were identified in whole-exome sequences from 51,289 de-identified individuals in the DiscovEHR cohort derived from a single US healthcare system. We integrated bioinformatics pathogenicity triage, mean serum Ca concentrations, and mode of inheritance to identify potential FHH1 or ADH1 variants, and we used a Sequence Kernel Association Test (SKAT) to identify rare variant-associated diseases. We identified predicted heterozygous loss-of-function CASR variants (6 different nonsense/frameshift variants and 12 different missense variants) in 38 unrelated individuals, 21 of whom were hypercalcemic. Missense CASR variants were identified in two unrelated hypocalcemic individuals. Functional studies showed that all hypercalcemia-associated missense variants impaired heterologous expression, plasma membrane targeting, and/or signaling, whereas hypocalcemia-associated missense variants increased expression, plasma membrane targeting, and/or signaling. Thus, 38 individuals with a genetic diagnosis of FHH1 and two individuals with a genetic diagnosis of ADH1 were identified in the 51,289 cohort, giving a prevalence in this population of 74.1 per 100,000 for FHH1 and 3.9 per 100,000 for ADH1. SKAT combining all nonsense, frameshift, and missense loss-of-function variants revealed associations with cardiovascular, neurological, and other diseases. In conclusion, FHH1 is a common cause of hypercalcemia, with prevalence similar to that of primary hyperparathyroidism, and is associated with altered disease risks, whereas ADH1 is a major cause of non-surgical hypoparathyroidism.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Regeneron Genetics Center, Humans, Hypercalcemia, Calcium, Receptors, Calcium-Sensing, Prevalence, Cohort Studies, Heterozygote, Genes, Dominant, Phenotype, Mutation, Adult, Aged, Aged, 80 and over, Middle Aged, Delivery of Health Care, United States, Female, Male |
| Divisions: | Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Life Courses and Medical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 29 Jun 2021 15:56 |
| Last Modified: | 18 Jan 2023 21:37 |
| DOI: | 10.1016/j.ajhg.2020.04.006 |
| Open Access URL: | https://www.cell.com/ajhg/fulltext/S0002-9297(20)3... |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3128157 |
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