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- W2100045383 abstract "Familial hypocalciuric hypercalcemia (FHH), neonatal severe hyperparathyroidism (NSHPT), and autosomal dominant hypocalcemia (ADH), in which calcium homeostasis is disordered, are associated with mutations in the calcium-sensing receptor (CASR). Six unrelated kindreds with FHH and/or NSHPT and two unrelated kindreds with ADH were studied. Direct sequence analysis of the exons of the CASR gene identified heterozygous mutations in six of the kindreds with FHH and in one of those with ADH. We performed functional analyses on the novel missense and insertion/frameshift mutants by transiently transfecting wild-type and mutant CASRs tagged with a c-Myc epitope in human embryonic kidney (HEK293) cells. All mutant receptors were expressed at a similar level to that of the wild type; however, whereas mutants R220W and A835T (the ADH mutant) were fully glycosylated and were visualized on the cell surface, glycosylation of mutants G549R and C850-851 ins/fs was impaired, resulting in reduced cell surface staining. In fura-2-loaded HEK293 cells expressing the wild-type or mutant receptors, the inactivating R220W mutant produced a significant shift to the right relative to the wild-type CASR in the cytosolic calcium response to increasing extracellular calcium concentrations and the G549R and C850-851 ins/fs mutants were without detectable activity. The activating A835T mutation resulted in a shift to the left in the cytosolic calcium response to extracellular calcium concentrations relative to the wild type. Our studies have identified novel CASR mutations that alter the function of the CASR in several different ways." @default.
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- W2100045383 date "2002-03-01" @default.
- W2100045383 modified "2023-10-17" @default.
- W2100045383 title "Identification and Functional Characterization of Novel Calcium-Sensing Receptor Mutations in Familial Hypocalciuric Hypercalcemia and Autosomal Dominant Hypocalcemia" @default.
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- W2100045383 doi "https://doi.org/10.1210/jcem.87.3.8280" @default.
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