ArticleHuman molecular genetics2018
Large-scale exome datasets reveal a new class of adaptor-related protein complex 2 sigma subunit (AP2σ) mutations, located at the interface with the AP2 alpha subunit, that impair calcium-sensing receptor signalling.
Article in Human molecular genetics, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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14 citing papers in PubMed, 22 citations in OpenAlex.
- Monitoring Calcium-Sensing Receptor (CaSR)-Induced Intracellular Calcium Flux Using an Indo-1 Flow Cytometry Assay.Methods in molecular biology (Clifton, N.J.) · 2025Article
- Familial states of primary hyperparathyroidism: an update.Journal of endocrinological investigation · 2024Review
- Genetics of hereditary forms of primary hyperparathyroidism.Hormones (Athens, Greece) · 2024Review
- Identification of prolactin receptor variants with diverse effects on receptor signalling.Journal of molecular endocrinology · 2023Article
- AP2S1 regulates APP degradation through late endosome-lysosome fusion in cells and APP/PS1 mice.Traffic (Copenhagen, Denmark) · 2023Article
- Epidemiology, Pathophysiology, and Genetics of Primary Hyperparathyroidism.Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2022Review
- Review
- Therapeutic Opportunities of Targeting Allosteric Binding Sites on the Calcium-Sensing Receptor.ACS pharmacology & translational science · 2021Review
- Misleading localization byBMC endocrine disorders · 2021Article
- Familial Hyperparathyroidism.Frontiers in endocrinology · 2021Review
- Endocytic Adaptor Proteins in Health and Disease: Lessons from Model Organisms and Human Mutations.Cells · 2019Review
- Coatopathies: Genetic Disorders of Protein Coats.Annual review of cell and developmental biology · 2019Review
- Evolution of Our Understanding of the Hyperparathyroid Syndromes: A Historical Perspective.Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2019Review
- The calcium-sensing receptor in physiology and in calcitropic and noncalcitropic diseases.Nature reviews. Endocrinology · 2018Review
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Authors and funding
9 authors at 4 institutions in 2 countries.
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Abstract
Mutations of the sigma subunit of the heterotetrameric adaptor-related protein complex 2 (AP2σ) impair signalling of the calcium-sensing receptor (CaSR), and cause familial hypocalciuric hypercalcaemia type 3 (FHH3). To date, FHH3-associated AP2σ mutations have only been identified at one residue, Arg15. We hypothesized that additional rare AP2σ variants may also be associated with altered CaSR function and hypercalcaemia, and sought for these by analysing >111 995 exomes (>60 706 from ExAc and dbSNP, and 51 289 from the Geisinger Health System-Regeneron DiscovEHR dataset, which also contains clinical data). This identified 11 individuals to have 9 non-synonymous AP2σ variants (Arg3His, Arg15His (x3), Ala44Thr, Phe52Tyr, Arg61His, Thr112Met, Met117Ile, Glu122Gly and Glu142Lys) with 3 of the 4 individuals who had Arg15His and Met117Ile AP2σ variants having mild hypercalcaemia, thereby indicating a prevalence of FHH3-associated AP2σ mutations of ∼7.8 per 100 000 individuals. Structural modelling of the novel eight AP2σ variants (Arg3His, Ala44Thr, Phe52Tyr, Arg61His, Thr112Met, Met117Ile, Glu122Gly and Glu142Lys) predicted that the Arg3His, Thr112Met, Glu122Gly and Glu142Lys AP2σ variants would disrupt polar contacts within the AP2σ subunit or affect the interface between the AP2σ and AP2α subunits. Functional analyses of all eight AP2σ variants in CaSR-expressing cells demonstrated that the Thr112Met, Met117Ile and Glu142Lys variants, located in the AP2σ α4-α5 helical region that forms an interface with AP2α, impaired CaSR-mediated intracellular calcium (Cai2+) signalling, consistent with a loss of function, and this was rectified by treatment with the CaSR positive allosteric modulator cinacalcet. Thus, our studies demonstrate another potential class of FHH3-causing AP2σ mutations located at the AP2σ-AP2α interface.
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