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Höppner J, Jüppner H. Rare genetic disorders that impair parathyroid hormone synthesis, secretion, or bioactivity provide insights into the diagnostic utility of different parathyroid hormone assays. Curr Opin Nephrol Hypertens 2024; 33:375-382. [PMID: 38701324 DOI: 10.1097/mnh.0000000000000999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
PURPOSE OF REVIEW Parathyroid hormone (PTH) is the major peptide hormone regulator of blood calcium homeostasis. Abnormal PTH levels can be observed in patients with various congenital and acquired disorders, including chronic kidney disease (CKD). This review will focus on rare human diseases caused by PTH mutations that have provided insights into the regulation of PTH synthesis and secretion as well as the diagnostic utility of different PTH assays. RECENT FINDINGS Over the past years, numerous diseases affecting calcium and phosphate homeostasis have been defined at the molecular level that are responsible for reduced or increased serum PTH levels. The underlying genetic mutations impair parathyroid gland development, involve the PTH gene itself, or alter function of the calcium-sensing receptor (CaSR) or its downstream signaling partners that contribute to regulation of PTH synthesis or secretion. Mutations in the pre sequence of the mature PTH peptide can, for instance, impair hormone synthesis or intracellular processing, while amino acid substitutions affecting the secreted PTH(1-84) impair PTH receptor (PTH1R) activation, or cause defective cleavage of the pro-sequence and thus secretion of a pro- PTH with much reduced biological activity. Mutations affecting the secreted hormone can alter detection by different PTH assays, thus requiring detailed knowledge of the utilized diagnostic test. SUMMARY Rare diseases affecting PTH synthesis and secretion have offered helpful insights into parathyroid biology and the diagnostic utility of commonly used PTH assays, which may have implications for the interpretation of PTH measurements in more common disorders such as CKD.
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Affiliation(s)
| | - Harald Jüppner
- Endocrine Unit
- Pediatric Nephrology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
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2
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Jung YL, Zhao W, Li I, Jain D, Epstein CB, Bernstein BE, Parangi S, Sherwood R, Robinson-Cohen C, Hsu YH, Park PJ, Mannstadt M. Epigenetic profiling reveals key genes and cis-regulatory networks specific to human parathyroids. Nat Commun 2024; 15:2106. [PMID: 38453887 PMCID: PMC10920874 DOI: 10.1038/s41467-024-46181-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 02/16/2024] [Indexed: 03/09/2024] Open
Abstract
In all terrestrial vertebrates, the parathyroid glands are critical regulators of calcium homeostasis and the sole source of parathyroid hormone (PTH). Hyperparathyroidism and hypoparathyroidism are clinically important disorders affecting multiple organs. However, our knowledge regarding regulatory mechanisms governing the parathyroids has remained limited. Here, we present the comprehensive maps of the chromatin landscape of the human parathyroid glands, identifying active regulatory elements and chromatin interactions. These data allow us to define regulatory circuits and previously unidentified genes that play crucial roles in parathyroid biology. We experimentally validate candidate parathyroid-specific enhancers and demonstrate their integration with GWAS SNPs for parathyroid-related diseases and traits. For instance, we observe reduced activity of a parathyroid-specific enhancer of the Calcium Sensing Receptor gene, which contains a risk allele associated with higher PTH levels compared to the wildtype allele. Our datasets provide a valuable resource for unraveling the mechanisms governing parathyroid gland regulation in health and disease.
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Affiliation(s)
- Youngsook Lucy Jung
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA.
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA.
| | - Wenping Zhao
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Ian Li
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Dhawal Jain
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | | | - Bradley E Bernstein
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Department of Cancer Biology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA, USA
- Departments of Cell Biology and Pathology, Harvard Medical School, Boston, MA, USA
| | - Sareh Parangi
- Department of Surgery, Newton Wellesley Hospital and Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Richard Sherwood
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Cambridge, MA, USA
| | - Cassianne Robinson-Cohen
- Division of Nephrology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Yi-Hsiang Hsu
- Hinda and Arthur Marcus Institute for Aging Research, Hebrew Senior Life, Boston, MA, USA
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Peter J Park
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | - Michael Mannstadt
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
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Yuan M, Liu X, Wang M, Li Z, Li H, Leng L, Wang S. A Functional Variant Alters the Binding of Bone morphogenetic protein 2 to the Transcription Factor NF-κB to Regulate Bone morphogenetic protein 2 Gene Expression and Chicken Abdominal Fat Deposition. Animals (Basel) 2023; 13:3401. [PMID: 37958155 PMCID: PMC10650395 DOI: 10.3390/ani13213401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 10/27/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
In this study, we employed a dual-luciferase reporter assay and electrophoretic mobility shift analysis (EMSA) in vitro to explore whether a 12-base pair (bp) insertion/deletion (InDel) variant (namely g.14798187_14798188insTCCCTGCCCCCT) within intron 2 of the chicken BMP2 gene, which was significantly associated with chicken abdominal fat weight and abdominal fat percentage, is a functional marker and its potential regulatory mechanism. The reporter analysis demonstrated that the luciferase activity of the deletion allele was extremely significantly higher than that of the insertion allele (p < 0.01). A bioinformatics analysis revealed that compared to the deletion allele, the insertion allele created a transcription factor binding site of nuclear factor-kappa B (NF-κB), which exhibited an inhibitory effect on fat deposition. A dual-luciferase reporter assay demonstrated that the inhibitory effect of NF-κB on the deletion allele was stronger than that on the insertion allele. EMSA indicated that the binding affinity of NF-κB for the insertion allele was stronger than that for the deletion allele. In conclusion, the 12-bp InDel chicken BMP2 gene variant is a functional variant affecting fat deposition in chickens, which may partially regulate BMP2 gene expression by affecting the binding of transcription factor NF-κB to the BMP2 gene.
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Affiliation(s)
- Meng Yuan
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; (M.Y.); (X.L.); (M.W.); (Z.L.); (H.L.)
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Xin Liu
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; (M.Y.); (X.L.); (M.W.); (Z.L.); (H.L.)
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Mengdie Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; (M.Y.); (X.L.); (M.W.); (Z.L.); (H.L.)
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Ziwei Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; (M.Y.); (X.L.); (M.W.); (Z.L.); (H.L.)
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Hui Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; (M.Y.); (X.L.); (M.W.); (Z.L.); (H.L.)
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Li Leng
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; (M.Y.); (X.L.); (M.W.); (Z.L.); (H.L.)
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Shouzhi Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; (M.Y.); (X.L.); (M.W.); (Z.L.); (H.L.)
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
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Parekh VI, Brinster LR, Guan B, Simonds WF, Weinstein LS, Agarwal SK. A Knock-In Mouse Model of the Gcm2 Variant p.Y392S Develops Normal Parathyroid Glands. J Endocr Soc 2023; 7:bvad126. [PMID: 37885910 PMCID: PMC10599131 DOI: 10.1210/jendso/bvad126] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Indexed: 10/28/2023] Open
Abstract
Context The glial cells missing 2 (GCM2) gene functions as a transcription factor that is essential for parathyroid gland development, and variants in this gene have been associated with 2 parathyroid diseases: isolated hypoparathyroidism in patients with homozygous germline inactivating variants and primary hyperparathyroidism in patients with heterozygous germline activating variants. A recurrent germline activating missense variant of GCM2, p.Y394S, has been reported in patients with familial primary hyperparathyroidism. Objective To determine whether the GCM2 p.Y394S missense variant causes overactive and enlarged parathyroid glands in a mouse model. Methods CRISPR/Cas9 gene editing technology was used to generate a mouse model with the germline heterozygous Gcm2 variant p.Y392S that corresponds to the human GCM2 p.Y394S variant. Wild-type (Gcm2+/+) and germline heterozygous (Gcm2+/Y392S) mice were evaluated for serum biochemistry and parathyroid gland morphology. Results Gcm2 +/Y392S mice did not show any change compared to Gcm2+/+ mice in serum calcium and parathyroid hormone levels, parathyroid gland histology, cell proliferation, or parathyroid gland size. Conclusion The mouse model of the p.Y392S variant of Gcm2 shows that this variant is tolerated in mice, as it does not increase parathyroid gland cell proliferation and circulating calcium or PTH levels. Further investigation of Gcm2+/Y392S mice to study the effect of this variant of Gcm2 on early events in parathyroid gland development will be of interest.
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Affiliation(s)
- Vaishali I Parekh
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Lauren R Brinster
- Office of Research Services, Division of Veterinary Resources, National Institutes of Health, Bethesda, MD 20892, USA
| | - Bin Guan
- Opthalmic Genomics Laboratory, National Eye Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - William F Simonds
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Lee S Weinstein
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Sunita K Agarwal
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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Homozygous Ser-1 to Pro-1 mutation in parathyroid hormone identified in hypocalcemic patients results in secretion of a biologically inactive pro-hormone. Proc Natl Acad Sci U S A 2023; 120:e2208047120. [PMID: 36795755 PMCID: PMC9974466 DOI: 10.1073/pnas.2208047120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
Like other secreted peptides, nascent parathyroid hormone (PTH) is synthesized with a pre- and a pro-sequence (25 and 6 amino acids, respectively). These precursor segments are sequentially removed in parathyroid cells before packaging into secretory granules. Three patients from two unrelated families who presented during infancy with symptomatic hypocalcemia were found to have a homozygous serine (S) to proline (P) change affecting the first amino acid of the mature PTH. Unexpectedly, biological activity of synthetic [P1]PTH(1-34) was indistinguishable from that of unmodified [S1]PTH(1-34). However, in contrast to conditioned medium from COS-7 cells expressing prepro[S1]PTH(1-84), medium from cells expressing prepro[P1]PTH(1-84) failed to stimulate cAMP production despite similar PTH levels when measured by an intact assay that detects PTH(1-84) and large amino-terminally truncated fragments thereof. Analysis of the secreted, but inactive PTH variant led to the identification of pro[P1]PTH(-6 to +84). Synthetic pro[P1]PTH(-6 to +34) and pro[S1]PTH(-6 to +34) had much less bioactivity than the corresponding PTH(1-34) analogs. Unlike pro[S1]PTH(-6 to +34), pro[P1]PTH(-6 to +34) was resistant to cleavage by furin suggesting that the amino acid variant impairs preproPTH processing. Consistent with this conclusion, plasma of patients with the homozygous P1 mutation had elevated proPTH levels, as determined with an in-house assay specific for pro[P1]PTH(-6 to +84). In fact, a large fraction of PTH detected by the commercial intact assay represented the secreted pro[P1]PTH. In contrast, two commercial biointact assays that use antibodies directed against the first few amino acid residues of PTH(1-84) for capture or detection failed to detect pro[P1]PTH.
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Mannstadt M, Cianferotti L, Gafni RI, Giusti F, Kemp EH, Koch CA, Roszko KL, Yao L, Guyatt GH, Thakker RV, Xia W, Brandi ML. Hypoparathyroidism: Genetics and Diagnosis. J Bone Miner Res 2022; 37:2615-2629. [PMID: 36375809 DOI: 10.1002/jbmr.4667] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 07/22/2022] [Accepted: 07/31/2022] [Indexed: 01/05/2023]
Abstract
This narrative report summarizes diagnostic criteria for hypoparathyroidism and describes the clinical presentation and underlying genetic causes of the nonsurgical forms. We conducted a comprehensive literature search from January 2000 to January 2021 and included landmark articles before 2000, presenting a comprehensive update of these topics and suggesting a research agenda to improve diagnosis and, eventually, the prognosis of the disease. Hypoparathyroidism, which is characterized by insufficient secretion of parathyroid hormone (PTH) leading to hypocalcemia, is diagnosed on biochemical grounds. Low albumin-adjusted calcium or ionized calcium with concurrent inappropriately low serum PTH concentration are the hallmarks of the disease. In this review, we discuss the characteristics and pitfalls in measuring calcium and PTH. We also undertook a systematic review addressing the utility of measuring calcium and PTH within 24 hours after total thyroidectomy to predict long-term hypoparathyroidism. A summary of the findings is presented here; results of the detailed systematic review are published separately in this issue of JBMR. Several genetic disorders can present with hypoparathyroidism, either as an isolated disease or as part of a syndrome. A positive family history and, in the case of complex diseases, characteristic comorbidities raise the clinical suspicion of a genetic disorder. In addition to these disorders' phenotypic characteristics, which include autoimmune diseases, we discuss approaches for the genetic diagnosis. © 2022 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Michael Mannstadt
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Luisella Cianferotti
- Bone Metabolic Diseases Unit, Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence, Italy
| | - Rachel I Gafni
- National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, USA
| | | | | | - Christian A Koch
- Department of Medicine/Endocrinology, Fox Chase Cancer Center, Philadelphia, PA, USA.,Department of Medicine/Endocrinology, The University of Tennessee Health Science Center, Memphis, TN, USA
| | - Kelly L Roszko
- National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, USA
| | - Liam Yao
- Department of Health Research Methods, Evidence, and Impact, and Department of Medicine, McMaster University, Hamilton, Canada
| | - Gordon H Guyatt
- Department of Health Research Methods, Evidence, and Impact, and Department of Medicine, McMaster University, Hamilton, Canada
| | - Rajesh V Thakker
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, Headington, Oxford, UK.,Oxford National Institute for Health Research (NIHR) Biomedical Research Centre, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, Oxford, UK
| | - Weibo Xia
- Department of Endocrinology, Peking Union Medical Collage Hospital, Beijing, China
| | - Maria-Luisa Brandi
- Fondazione Italiana sulla Ricerca sulle Malattie dell'Osso (F.I.R.M.O. Foundation), Florence, Italy
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Newey PJ, Hannan FM, Wilson A, Thakker RV. Genetics of monogenic disorders of calcium and bone metabolism. Clin Endocrinol (Oxf) 2022; 97:483-501. [PMID: 34935164 PMCID: PMC7614875 DOI: 10.1111/cen.14644] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/24/2021] [Accepted: 11/07/2021] [Indexed: 12/19/2022]
Abstract
Disorders of calcium homeostasis are the most frequent metabolic bone and mineral disease encountered by endocrinologists. These disorders usually manifest as primary hyperparathyroidism (PHPT) or hypoparathyroidism (HP), which have a monogenic aetiology in 5%-10% of cases, and may occur as an isolated endocrinopathy, or as part of a complex syndrome. The recognition and diagnosis of these disorders is important to facilitate the most appropriate management of the patient, with regard to both the calcium-related phenotype and any associated clinical features, and also to allow the identification of other family members who may be at risk of disease. Genetic testing forms an important tool in the investigation of PHPT and HP patients and is usually reserved for those deemed to be an increased risk of a monogenic disorder. However, identifying those suitable for testing requires a thorough clinical evaluation of the patient, as well as an understanding of the diversity of relevant phenotypes and their genetic basis. This review aims to provide an overview of the genetic basis of monogenic metabolic bone and mineral disorders, primarily focusing on those associated with abnormal calcium homeostasis, and aims to provide a practical guide to the implementation of genetic testing in the clinic.
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Affiliation(s)
- Paul J Newey
- Division of Molecular and Clinical Medicine, Ninewells Hospital & Medical School, University of Dundee, Scotland, UK
| | - Fadil M Hannan
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, UK
| | - Abbie Wilson
- Division of Molecular and Clinical Medicine, Ninewells Hospital & Medical School, University of Dundee, Scotland, UK
| | - Rajesh V Thakker
- Academic Endocrine Unit, Oxford Centre for Diabetes, Endocrinology & Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
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Hawkes CP, Al Jubeh JM, Li D, Tucker SE, Rajiyah T, Levine MA. Novel PTH Gene Mutations Causing Isolated Hypoparathyroidism. J Clin Endocrinol Metab 2022; 107:e2449-e2458. [PMID: 35165722 PMCID: PMC9113798 DOI: 10.1210/clinem/dgac086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Indexed: 11/19/2022]
Abstract
CONTEXT Parathyroid hormone (PTH) gene mutations represent a rare cause of familial isolated hypoparathyroidism (FIH). These defects can cause hypoparathyroidism with increased or decreased serum levels of PTH through 1) impaired PTH synthesis; 2) induction of parathyroid cell apoptosis; or 3) secretion of bioinactive PTH molecules. Eight pathogenic mutations of this gene have been described previously. OBJECTIVE Through describing 2 novel mutations of the PTH gene, we aim to extend the molecular basis for FIH and further refine the proposed mechanisms by which PTH mutations cause hypoparathyroidism. METHODS Proband case reports were compiled with extended family analysis. The probands in both kindreds presented before age 10 days with hypocalcemia and elevated phosphate levels. Proband A had low PTH levels, whereas these levels were elevated in Proband B. Proband B was initially diagnosed with pseudohypoparathyroidism. Methylation analysis was performed of CpG dinucleotides within 3 GNAS differentially methylated regions; whole-genome sequencing; and PTH infusion with analysis of nephrogenous 3',5'-cyclic adenosine 5'-monophosphate. RESULTS Proband A had a novel heterozygous sequence change in exon 2 of the PTH gene, c.46_47delinsAA (p.Ala16Lys), and proband B had a novel homozygous nucleotide transition in PTH exon 3 (c.128G > A; p.G43E) that led to replacement of glycine by glutamic acid at position 12 of PTH 1-84. PTH 1-34 infusion demonstrated that renal responsiveness to PTH was intact and not antagonized by circulating bioinactive PTH. CONCLUSION PTH gene mutations are uncommon causes of hypoparathyroidism, but can be misdiagnosed as disorders of gland development or receptor function if PTH levels are decreased or elevated, respectively. Genetic testing should be considered early in the diagnostic approach to these presentations.
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Affiliation(s)
- Colin P Hawkes
- Division of Endocrinology and Diabetes, The Children’s Hospital of Philadelphia (CHOP), Philadelphia, Pennsylvania, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Department of Paediatrics and Child Health, University College Cork, Cork, Ireland
| | - Jamal M Al Jubeh
- Department of Pediatrics, Sheikh Khalifa Medical City, Abu Dhabi, United Arab Emirates
| | - Dong Li
- Center for Applied Genomics, CHOP, Philadelphia, Pennsylvania, USA
| | - Susan E Tucker
- Section of Adult and Pediatric Endocrinology, Diabetes, and Metabolism, The University of Chicago, Chicago, Illinois, USA
| | - Tara Rajiyah
- Section of Adult and Pediatric Endocrinology, Diabetes, and Metabolism, The University of Chicago, Chicago, Illinois, USA
| | - Michael A Levine
- Division of Endocrinology and Diabetes, The Children’s Hospital of Philadelphia (CHOP), Philadelphia, Pennsylvania, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Correspondence: Michael A. Levine, MD, Division of Pediatric Endocrinology and Diabetes, The Children’s Hospital of Philadelphia, ARC510A, 3615 Civic Center Blvd, Philadelphia, PA 19104, USA.
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9
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Vincze S, Peters NV, Kuo CL, Brown TC, Korah R, Murtha TD, Bellizzi J, Riccardi A, Parham K, Carling T, Costa-Guda J, Arnold A. GCM2 Variants in Familial and Multiglandular Primary Hyperparathyroidism. J Clin Endocrinol Metab 2022; 107:e2021-e2026. [PMID: 34967908 DOI: 10.1210/clinem/dgab929] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Indexed: 11/19/2022]
Abstract
CONTEXT Multiglandular and familial parathyroid disease constitute important fractions of primary hyperparathyroidism (PHPT). Germline missense variants of GCM2, a regulator of parathyroid development, were observed in familial isolated hyperparathyroidism and sporadic PHPT. However, as these previously reported GCM2 variants occur at relatively high frequencies in the population, understanding their potential clinical utility will require both additional penetrance data and functional evidence relevant to tumorigenicity. OBJECTIVE Determine the frequency of GCM2 variants of interest among patients with sporadic multigland or familial parathyroid disease and assess their penetrance. DESIGN AND PATIENTS DNA-encoding PHPT-associated GCM2 germline variants were polymerase chain reaction-amplified and sequenced from 107 patients with either sporadic multigland or suspected/confirmed familial parathyroid tumors. RESULTS GCM2 variants were observed in 9 of 107 cases (8.4%): Y282D in 4 patients (6.3%) with sporadic multigland disease; Y394S in 2 patients (11.1%) with familial PHPT and 3 (4.8%) with sporadic multigland disease. Compared with the general population, Y282D was enriched 5.9-fold in multigland disease, but its penetrance was very low (0.02%). Y394S was enriched 79-fold in sporadic multigland disease and 93-fold in familial PHPT, but its penetrance was low (1.33% and 1.04%, respectively). CONCLUSIONS Observed in vitro-activating GCM2 variant alleles are significantly overrepresented in PHPT patients with multiglandular or familial disease compared to the general population, yet penetrance values are very low; that is, most individuals with these variants in the population have a very low risk of developing PHPT. The potential clinical utility of detecting these GCM2 variants requires further investigation, including assessing their possible role as pathogenic/low-penetrance alleles.
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Affiliation(s)
- Sarah Vincze
- Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Nicholas V Peters
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Chia-Ling Kuo
- Biostatistics Center, Connecticut Institute for Clinical and Translational Science, University of Connecticut, Farmington, CT, USA
| | - Taylor C Brown
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
- Department of Surgery, Washington University School of Medicine, St. Louis, MO,USA
| | - Reju Korah
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Timothy D Murtha
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Justin Bellizzi
- Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Aaliyah Riccardi
- Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, CT, USA
- Department of Otolaryngology-Head and Neck Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Kourosh Parham
- Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Tobias Carling
- Biostatistics Center, Connecticut Institute for Clinical and Translational Science, University of Connecticut, Farmington, CT, USA
- Carling Adrenal Center, Hospital for Endocrine Surgery, Tampa, FL, USA
| | - Jessica Costa-Guda
- Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, CT, USA
- Center for Regenerative Medicine and Skeletal Development, University of Connecticut School of Dental Medicine, Farmington, CT, USA
| | - Andrew Arnold
- Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, CT, USA
- Division of Endocrinology and Metabolism, University of Connecticut School of Medicine, Farmington, CT, USA
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10
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Canaff L, Guarnieri V, Kim Y, Wong BYL, Nolin-Lapalme A, Cole DEC, Minisola S, Eller-Vainicher C, Cetani F, Repaci A, Turchetti D, Corbetta S, Scillitani A, Goltzman D. Novel Glial Cells Missing-2 (GCM2) variants in parathyroid disorders. Eur J Endocrinol 2022; 186:351-366. [PMID: 35038313 DOI: 10.1016/10.1530/eje-21-0433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 01/13/2022] [Indexed: 05/25/2023]
Abstract
OBJECTIVE The aim of this study was to analyze variants of the gene glial cells missing-2 (GCM2), encoding a parathyroid cell-specific transcription factor, in familial hypoparathyroidism and in familial isolated hyperparathyroidism (FIHP) without and with parathyroid carcinoma. DESIGN We characterized 2 families with hypoparathyroidism and 19 with FIHP in which we examined the mechanism of action of GCM2 variants. METHODS Leukocyte DNA of hypoparathyroid individuals was Sanger sequenced for CASR, PTH, GNA11 and GCM2 mutations. DNA of hyperparathyroid individuals underwent MEN1, CDKN1B, CDC73, CASR, RET and GCM2 sequencing. The actions of identified GCM2 variants were evaluated by in vitro functional analyses. RESULTS A novel homozygous p.R67C GCM2 mutation which failed to stimulate transcriptional activity in a luciferase assay was identified in affected members of two hypoparathyroid families. Oligonucleotide pull-down assay and in silico structural modeling indicated that this mutant had lost the ability to bind the consensus GCM recognition sequence of DNA. Two novel (p.I383M and p.T386S) and one previously reported (p.Y394S) heterozygous GCM2 variants that lie within a C-terminal conserved inhibitory domain were identified in three affected individuals of the hyperparathyroid families. One family member, heterozygous for p.I138M, had parathyroid carcinoma (PC), and a heterozygous p.V382M variant was found in another patient affected by sporadic PC. These variants exerted significantly enhanced in vitrotranscriptional activity, including increased stimulation of the PTH promoter. CONCLUSIONS We provide evidence that two novel GCM2 R67C inactivating mutations with an inability to bind DNA are causative of hypoparathyroidism. Additionally, we provide evidence that two novel GCM2 variants increased transactivation of the PTH promoter in vitro and are associated with FIHP. Furthermore, our studies suggest that activating GCM2 variants may contribute to facilitating more aggressive parathyroid disease.
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Affiliation(s)
- Lucie Canaff
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
| | - Vito Guarnieri
- Division of Medical Genetics and Unit of Endocrinology, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Yoojung Kim
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
| | - Betty Y L Wong
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Alexis Nolin-Lapalme
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
| | - David E C Cole
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Salvatore Minisola
- Department of Internal Medicine and Medical Disciplines, 'Sapienza' Rome University, Rome, Italy
| | - Cristina Eller-Vainicher
- Department of Medical Sciences and Community, Fondazione Ca'Granda IRCCS Ospedale Maggiore Policlinico, Milan, Italy
| | | | - Andrea Repaci
- Unit of Endocrinology, S. Orsola Malpighi Hospital, Bologna, Italy
| | - Daniela Turchetti
- Center for the Studies of Hereditary Cancers, Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Sabrina Corbetta
- Endocrinology and Diabetology Service, IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
| | - Alfredo Scillitani
- Division of Medical Genetics and Unit of Endocrinology, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - David Goltzman
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
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Canaff L, Guarnieri V, Kim Y, Wong BYL, Nolin-Lapalme A, Cole DEC, Minisola S, Eller-Vainicher C, Cetani F, Repaci A, Turchetti D, Corbetta S, Scillitani A, Goltzman D. Novel Glial Cells Missing-2 (GCM2) variants in parathyroid disorders. Eur J Endocrinol 2022; 186:351-366. [PMID: 35038313 PMCID: PMC8859918 DOI: 10.1530/eje-21-0433] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 01/13/2022] [Indexed: 11/08/2022]
Abstract
OBJECTIVE The aim of this study was to analyze variants of the gene glial cells missing-2 (GCM2), encoding a parathyroid cell-specific transcription factor, in familial hypoparathyroidism and in familial isolated hyperparathyroidism (FIHP) without and with parathyroid carcinoma. DESIGN We characterized 2 families with hypoparathyroidism and 19 with FIHP in which we examined the mechanism of action of GCM2 variants. METHODS Leukocyte DNA of hypoparathyroid individuals was Sanger sequenced for CASR, PTH, GNA11 and GCM2 mutations. DNA of hyperparathyroid individuals underwent MEN1, CDKN1B, CDC73, CASR, RET and GCM2 sequencing. The actions of identified GCM2 variants were evaluated by in vitro functional analyses. RESULTS A novel homozygous p.R67C GCM2 mutation which failed to stimulate transcriptional activity in a luciferase assay was identified in affected members of two hypoparathyroid families. Oligonucleotide pull-down assay and in silico structural modeling indicated that this mutant had lost the ability to bind the consensus GCM recognition sequence of DNA. Two novel (p.I383M and p.T386S) and one previously reported (p.Y394S) heterozygous GCM2 variants that lie within a C-terminal conserved inhibitory domain were identified in three affected individuals of the hyperparathyroid families. One family member, heterozygous for p.I138M, had parathyroid carcinoma (PC), and a heterozygous p.V382M variant was found in another patient affected by sporadic PC. These variants exerted significantly enhanced in vitrotranscriptional activity, including increased stimulation of the PTH promoter. CONCLUSIONS We provide evidence that two novel GCM2 R67C inactivating mutations with an inability to bind DNA are causative of hypoparathyroidism. Additionally, we provide evidence that two novel GCM2 variants increased transactivation of the PTH promoter in vitro and are associated with FIHP. Furthermore, our studies suggest that activating GCM2 variants may contribute to facilitating more aggressive parathyroid disease.
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Affiliation(s)
- Lucie Canaff
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
| | - Vito Guarnieri
- Division of Medical Genetics and Unit of Endocrinology, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Yoojung Kim
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
| | - Betty Y L Wong
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Alexis Nolin-Lapalme
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
| | - David E C Cole
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Salvatore Minisola
- Department of Internal Medicine and Medical Disciplines, ‘Sapienza’ Rome University, Rome, Italy
| | - Cristina Eller-Vainicher
- Department of Medical Sciences and Community, Fondazione Ca’Granda IRCCS Ospedale Maggiore Policlinico, Milan, Italy
| | | | - Andrea Repaci
- Unit of Endocrinology, S. Orsola Malpighi Hospital, Bologna, Italy
| | - Daniela Turchetti
- Center for the Studies of Hereditary Cancers, Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Sabrina Corbetta
- Endocrinology and Diabetology Service, IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
| | - Alfredo Scillitani
- Division of Medical Genetics and Unit of Endocrinology, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - David Goltzman
- Metabolic Complications and Disorders, Research Institute-McGill University Health Centre, Montreal, Quebec, Canada
- Correspondence should be addressed to D Goltzman;
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12
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Karunakar P, Krishnamurthy S, Rajavelu TN, Deepthi B, Thangaraj A, Chidambaram AC. A child with tetany, convulsions, and nephrocalcinosis: Answers. Pediatr Nephrol 2021; 36:4119-4122. [PMID: 34491438 DOI: 10.1007/s00467-021-05238-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 07/06/2021] [Indexed: 11/29/2022]
Affiliation(s)
- Pediredla Karunakar
- Department of Pediatrics, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, 605006, India
| | - Sriram Krishnamurthy
- Department of Pediatrics, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, 605006, India.
| | | | - Bobbity Deepthi
- Department of Pediatrics, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, 605006, India
| | - Abarna Thangaraj
- Department of Pediatrics, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, 605006, India
| | - Aakash Chandran Chidambaram
- Department of Pediatrics, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, 605006, India
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13
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Singh P, Bhadada SK, Dahiya D, Saikia UN, Arya AK, Sachdeva N, Kaur J, Behera A, Brandi ML, Rao SD. GCM2 Silencing in Parathyroid Adenoma Is Associated With Promoter Hypermethylation and Gain of Methylation on Histone 3. J Clin Endocrinol Metab 2021; 106:e4084-e4096. [PMID: 34077544 PMCID: PMC8475237 DOI: 10.1210/clinem/dgab374] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Indexed: 02/06/2023]
Abstract
CONTEXT Glial cells missing 2 (GCM2), a zinc finger-transcription factor, is essentially required for the development of the parathyroid glands. OBJECTIVE We sought to identify whether the epigenetic alterations in GCM2 transcription are involved in the pathogenesis of sporadic parathyroid adenoma. In addition, we examined the association between promoter methylation and histone modifications with disease indices. METHODS Messenger RNA (mRNA) and protein expression of GCM2 were analyzed by reverse transcriptase-quantitative polymerase chain reaction (RT-qPCR) and immunohistochemistry in 33 adenomatous and 10 control parathyroid tissues. DNA methylation and histone methylation/acetylation of the GCM2 promoter were measured by bisulfite sequencing and chromatin immunoprecipitation-qPCR. Additionally, we investigated the role of epigenetic modifications on GCM2 and DNA methyltransferase 1 (DNMT1) expression in parathyroid (PTH)-C1 cells by treating with 5-aza-2'-deoxycytidine (DAC) and BRD4770 and assessed for GCM2 mRNA and DNMT1 protein levels. RESULTS mRNA and protein expression of GCM2 were lower in sporadic adenomatous than in control parathyroid tissues. This reduction correlated with hypermethylation (P < .001) and higher H3K9me3 levels in the GCM2 promoter (P < .04) in adenomas. In PTH-C1 cells, DAC treatment resulted in increased GCM2 transcription and decreased DNMT1 protein expression, while cells treated with the BRD4770 showed reduced H3K9me3 levels but a nonsignificant change in GCM2 transcription. CONCLUSION These findings suggest the concurrent association of promoter hypermethylation and higher H3K9me3 with the repression of GCM2 expression in parathyroid adenomas. Treatment with DAC restored GCM2 expression in PTH-C1 cells. Our results showed a possible epigenetic landscape in the tumorigenesis of parathyroid adenoma and also that DAC may be a promising avenue of research for parathyroid adenoma therapeutics.
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Affiliation(s)
- Priyanka Singh
- Department of Endocrinology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Sanjay Kumar Bhadada
- Department of Endocrinology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
- Correspondence: Sanjay Kumar Bhadada, MD, DM, Department of Endocrinology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India.
| | - Divya Dahiya
- Department of General Surgery, PGIMER, Chandigarh, 160012, India
| | | | - Ashutosh Kumar Arya
- Department of Endocrinology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Naresh Sachdeva
- Department of Endocrinology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Jyotdeep Kaur
- Department of Biochemistry, PGIMER, Chandigarh, 160012, India
| | - Arunanshu Behera
- Department of General Surgery, PGIMER, Chandigarh, 160012, India
| | - Maria Luisa Brandi
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence 50121, Italy
| | - Sudhaker Dhanwada Rao
- Bone and Mineral Research Laboratory, Henry Ford Hospital, Detroit, Michigan 48202, USA
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14
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Arnold A, Dennison E, Kovacs CS, Mannstadt M, Rizzoli R, Brandi ML, Clarke B, Thakker RV. Hormonal regulation of biomineralization. Nat Rev Endocrinol 2021; 17:261-275. [PMID: 33727709 DOI: 10.1038/s41574-021-00477-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/29/2021] [Indexed: 01/31/2023]
Abstract
Biomineralization is the process by which organisms produce mineralized tissues. This crucial process makes possible the rigidity and flexibility that the skeleton needs for ambulation and protection of vital organs, and the hardness that teeth require to tear and grind food. The skeleton also serves as a source of mineral in times of short supply, and the intestines absorb and the kidneys reclaim or excrete minerals as needed. This Review focuses on physiological and pathological aspects of the hormonal regulation of biomineralization. We discuss the roles of calcium and inorganic phosphate, dietary intake of minerals and the delicate balance between activators and inhibitors of mineralization. We also highlight the importance of tight regulation of serum concentrations of calcium and phosphate, and the major regulators of biomineralization: parathyroid hormone (PTH), the vitamin D system, vitamin K, fibroblast growth factor 23 (FGF23) and phosphatase enzymes. Finally, we summarize how developmental stresses in the fetus and neonate, and in the mother during pregnancy and lactation, invoke alternative hormonal regulatory pathways to control mineral delivery, skeletal metabolism and biomineralization.
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Affiliation(s)
- Andrew Arnold
- Division of Endocrinology & Metabolism and Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, CT, USA.
| | - Elaine Dennison
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK
| | - Christopher S Kovacs
- Faculty of Medicine - Endocrinology, Memorial University of Newfoundland, St. John's, NL, Canada
| | - Michael Mannstadt
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - René Rizzoli
- Division of Bone Diseases, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - Maria Luisa Brandi
- Department of Biochemical, Experimental and Clinical Sciences, University of Florence, Florence, Italy
| | - Bart Clarke
- Mayo Clinic Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Rochester, MN, USA
| | - Rajesh V Thakker
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
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15
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Wang WJ, Guo YQ, Xie KJ, Li YD, Li ZW, Wang N, Xiao F, Guo HS, Li H, Wang SZ. A functional variant in the promoter region of IGF1 gene is associated with chicken abdominal fat deposition. Domest Anim Endocrinol 2021; 75:106584. [PMID: 33276215 DOI: 10.1016/j.domaniend.2020.106584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 10/26/2020] [Accepted: 11/03/2020] [Indexed: 12/29/2022]
Abstract
Insulin-like growth factor 1 (IGF1) plays an important role in the regulation of cell growth, proliferation, differentiation, and apoptosis. Previously several studies revealed that genotypes of chicken IGF1 c.-366A > C were significantly associated with abdominal fat weight and body weight in chickens. But the underlying mechanism is still unknown. To investigate the mechanism underlying the association, herein, we performed IGF1 gene mRNA expression profiling, a dual-luciferase reporter assay and electrophoretic mobility shift assay (EMSA). Quantitative real-time PCR results showed that IGF1 gene was widely expressed in 14 tissues. The mRNA expression levels of IGF1 gene in both abdominal fat and jejunum were significantly higher in fat broilers than in lean broilers. However, the opposite results were observed in the pancreas. The reporter gene assay showed that the promoter luciferase activity of allele A was significantly higher than that of allele C (P < 0.05). In addition, the luciferase activity of allele A promoted by the transcription factor AP1 and OCT1 was higher than that of allele C (P < 0.05). Electrophoretic mobility shift assay result showed that allele A binding to the transcription factor AP1 and OCT1 was stronger than that of allele C. All in all, our data indicated that the IGF1 gene c.-366A > C is a functional SNP responsible for chicken adipose deposition.
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Affiliation(s)
- W J Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Y Q Guo
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - K J Xie
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Y D Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - Z W Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - N Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - F Xiao
- Fujian Sunnzer Biotechnology Development Co, Ltd, Guangze, Fujian Province 354100, China
| | - H S Guo
- Fujian Sunnzer Biotechnology Development Co, Ltd, Guangze, Fujian Province 354100, China
| | - H Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
| | - S Z Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin 150030, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin 150030, China; College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China.
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16
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Five patients with disorders of calcium metabolism presented with GCM2 gene variants. Sci Rep 2021; 11:2968. [PMID: 33536578 PMCID: PMC7859196 DOI: 10.1038/s41598-021-82661-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 01/22/2021] [Indexed: 02/07/2023] Open
Abstract
The GCM2 gene encodes a transcription factor predominantly expressed in parathyroid cells that is known to be critical for development, proliferation and maintenance of the parathyroid cells. A cohort of 127 Spanish patients with a disorder of calcium metabolism were screened for mutations by Next-Generation Sequencing (NGS). A targeted panel for disorders of calcium and phosphorus metabolism was designed to include 65 genes associated with these disorders. We observed two variants of uncertain significance (p.(Ser487Phe) and p.Asn315Asp), one likely pathogenic (p.Val382Met) and one benign variant (p.Ala393_Gln395dup) in the GCM2 gene in the heterozygous state in five families (two index cases had hypocalcemia and hypoparathyroidism, respectively, and three index cases had primary hyperparathyroidism). Our study shows the utility of NGS in unravelling the genetic origin of some disorders of the calcium and phosphorus metabolism, and confirms the GCM2 gene as an important element for the maintenance of calcium homeostasis. Importantly, a novel variant in the GCM2 gene (p.(Ser487Phe)) has been found in a patient with hypocalcemia.
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17
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Wang W, Li Y, Li Z, Wang N, Xiao F, Gao H, Guo H, Li H, Wang S. Polymorphisms of KLF3 gene coding region and identification of their functionality for abdominal fat in chickens. Vet Med Sci 2020; 7:792-799. [PMID: 33369233 PMCID: PMC8136968 DOI: 10.1002/vms3.422] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 11/23/2020] [Accepted: 12/09/2020] [Indexed: 12/20/2022] Open
Abstract
KLF3 is a member of the Kruppel‐like factor (KLF) family of transcription factors, and plays an important role in several biological processes, including adipogenesis, erythropoiesis and B‐cell development. The purposes of this study are to search for polymorphisms of KLF3 coding region and to provide functional evidence for abdominal fat in chickens. A total of 168 SNPs in KLF3 coding region were detected in a unique chicken population, the Northeast Agricultural University broiler lines divergently selected for abdominal fat content (NEAUHLF). Of which three single nucleotide polymorphisms (g.3452T > C, g.8663A > G and g.10751G > A) were significantly correlated with abdominal fat weight (AFW) and abdominal fat percentage (AFP) of 329 birds from the 19th generation of NEAUHLF (FDR < 0.05). The reporter gene assay was performed to verify functionality of these three SNPs in both ICP‐1 and DF1 cells. Results showed that the luciferase activity of G allele was significantly higher than that of A allele in g.10751G > A (p < 0.05). However, there were no significant differences between different alleles of others two SNPs in luciferase activity. Overall, KLF3 is an important candidate gene that affects chicken abdominal fat content, and the g.10751G > A is a functional variant that potential would be applied to marker‐assisted selection (MAS) for selective breeding programme.
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Affiliation(s)
- Weijia Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin, China.,Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin, China.,College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Yudong Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin, China.,Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin, China.,College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Ziwei Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin, China.,Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin, China.,College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Ning Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin, China.,Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin, China.,College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Fan Xiao
- Fujian Sunnzer Biotechnology Development Co., Ltd., Guangze, Fujian Province, China
| | - Haihe Gao
- Fujian Sunnzer Biotechnology Development Co., Ltd., Guangze, Fujian Province, China
| | - Huaishun Guo
- Fujian Sunnzer Biotechnology Development Co., Ltd., Guangze, Fujian Province, China
| | - Hui Li
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin, China.,Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin, China.,College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
| | - Shouzhi Wang
- Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin, China.,Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang Province, Harbin, China.,College of Animal Science and Technology, Northeast Agricultural University, Harbin, China
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18
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Song A, Yang Y, Wang Y, Liu S, Nie M, Jiang Y, Li M, Xia W, Wang O, Xing X. Germline GCM2 Mutation Screening in Chinese Primary Hyperparathyroidism Patients. Endocr Pract 2020; 26:1093-1104. [PMID: 33471711 DOI: 10.4158/ep-2020-0132] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Accepted: 05/10/2020] [Indexed: 01/15/2023]
Abstract
OBJECTIVE Glial cell missing 2 (GCM2), the critical regulator in the development of parathyroid glands, has been associated with the pathogenesis of primary hyperparathyroidism (PHPT). Relevant data in Chinese and other Asian populations are still lacking. This study aimed to screen the germline mutations of GCM2 in Chinese PHPT patients. METHODS A total of 232 patients diagnosed with PHPT at the Peking Union Medical College Hospital from July, 2016, to February, 2019, were screened using targeted next-generation sequencing to identify rare variants of 8 candidate genes associated with PHPT, including GCM2. Luciferase assays were performed to determine the functional impact of the GCM2 variants. RESULTS Four male patients were found to carry 3 rare missense variants of the GCM2 gene, including c.1162A>G (p.K388E), c.1144G>A (p.V382M), and c.1247A>G (p.Y416C). Two variants (p.K388E and p.V382M) located within a highly conserved region were associated with GCM2 transactivation function. The 2 cases carrying the p.K388E mutation had a pathology of carcinoma, and the case with the p.V382M mutation had atypical adenoma. CONCLUSION This study determined an overall GCM2 gain-of-function mutation frequency of 1.3% in a relatively large-sample-sized Chinese PHPT cohort and supported a higher malignant tendency in cases carrying activating GCM2 mutations. Hence, preoperative screening for these GCM2 mutations might be beneficial to treatment decisions, and longer follow-up for such patients is recommended.
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Affiliation(s)
- An Song
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Yi Yang
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Yabing Wang
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Shuzhong Liu
- the Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences
| | - Min Nie
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Yan Jiang
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Mei Li
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Weibo Xia
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Ou Wang
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China.
| | - Xiaoping Xing
- From the Key laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China.
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Abstract
Hypoparathyroidism, a disorder characterized by hypocalcemia ensuing from inadequate parathyroid hormone secretion, is a rather rare disorder caused by multiple etiologies. When not caused by inadvertent damage or removal of the parathyroids during neck surgery, it is usually genetically determined. Epidemiological figures of this disease are still scarce and mainly limited to countries where non-anonymous databases are available and to surgical case series. Both the surgical and non-surgical forms pose diagnostic challenges. For surgical hypoparathyroidism, transient forms have to be ruled out even in the long term, in order to avoid unnecessary chronic replacement therapy with calcium and calcitriol. Regarding non-surgical hypoparathyroidism, once referred to as idiopathic, a systematic clinically and genetically-driven approach to define the precise diagnosis have to be pursued. In the case of syndromic hypoparathyroidism, patients have to be screened for associated abnormalities. Autoimmune, non-genetic hypoparathyroidism is still a diagnosis of exclusion, since no specific autoantibodies are specific for this condition.
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Affiliation(s)
- Luisella Cianferotti
- Department of Surgery and Translational Medicine, University of Florence, Bone Metabolic Diseases Unit, University Hospital of Florence, Italy.
| | - Gemma Marcucci
- Department of Surgery and Translational Medicine, University of Florence, Bone Metabolic Diseases Unit, University Hospital of Florence, Italy.
| | - Maria Luisa Brandi
- Department of Surgery and Translational Medicine, University of Florence, Bone Metabolic Diseases Unit, University Hospital of Florence, Italy.
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Abstract
Calcium is vital for life, and extracellular calcium concentrations must constantly be maintained within a precise concentration range. Low serum calcium (hypocalcemia) occurs in conjunction with multiple disorders and can be life-threatening if severe. Symptoms of acute hypocalcemia include neuromuscular irritability, tetany, and seizures, which are rapidly resolved with intravenous administration of calcium gluconate. However, disorders that lead to chronic hypocalcemia often have more subtle manifestations. Hypoparathyroidism, characterized by impaired secretion of parathyroid hormone (PTH), a key regulatory hormone for maintaining calcium homeostasis, is a classic cause of chronic hypocalcemia. Disorders that disrupt the metabolism of vitamin D can also lead to chronic hypocalcemia, as vitamin D is responsible for increasing the gut absorption of dietary calcium. Treatment and management options for chronic hypocalcemia vary depending on the underlying disorder. For example, in patients with hypoparathyroidism, calcium and vitamin D supplementation must be carefully titrated to avoid symptoms of hypocalcemia while keeping serum calcium in the low-normal range to minimize hypercalciuria, which can lead to renal dysfunction. Management of chronic hypocalcemia requires knowledge of the factors that influence the complex regulatory axes of calcium homeostasis in a given disorder. This chapter discusses common and rare disorders of hypocalcemia, symptoms and workup, and management options including replacement of PTH in hypoparathyroidism.
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Affiliation(s)
- Erin Bove-Fenderson
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Thier 1101, 50 Blossom St, Boston, MA, 02114, USA
| | - Michael Mannstadt
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Thier 1101, 50 Blossom St, Boston, MA, 02114, USA.
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21
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Zhang K, Cheng BH, Yang LL, Wang ZP, Zhang HL, Xu SS, Wang SZ, Wang YX, Zhang H, Li H. Identification of a potential functional single nucleotide polymorphism for fatness and growth traits in the 3'-untranslated region of the PCSK1 gene in chickens. J Anim Sci 2018; 95:4776-4786. [PMID: 29293721 DOI: 10.2527/jas2017.1706] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Prohormone convertase 1/3 is a serine endoprotease belonging to the subtilisin-like proprotein convertase family that is encoded by the () gene, and its major function is the processing and bioactivation of the proproteins of many kinds of neuroendocrine hormones, including insulin, cholecystokinin, and adrenocorticotropic hormone. The results of our previous genomewide association study indicated that the gene might be an important candidate gene for fatness traits in chickens. The objectives of this study were to investigate the tissue expression profiles of gene and to identify functional variants associated with fatness and growth traits in the chicken. The results indicated that mRNA was widely expressed in various tissues, especially neuroendocrine and intestinal tissues. Of these 2 tissue types, mRNA expression in lean males was significantly higher than in fat males. A SNP in the 3' untranslated region of (c.*900G > A) was identified. Association analysis in the Arbor Acres commercial broiler population and Northeast Agricultural University broiler lines divergently selected for abdominal fat content (NEAUHLF) population showed that the SNP c.*900G > A was associated with abdominal fat weight, abdominal fat percentage, BW, metatarsus length, and metatarsal circumference. In the 5th to 19th generation (G to G) of NEAUHLF, the allele frequency of c.*900G > A changed along with selection for abdominal fat content. At G, allele G of c.*900G > A was predominate in the lean line, whereas allele A was predominate in the fat line. Functional analysis demonstrated that allele A of c.*900G > A reduced mRNA stability and consequently downregulated gene expression. These results suggested that c.*900G > A was a functional SNP for fatness and growth traits in the chicken. The results of this study provide basic molecular information for the role of gene in avian growth and development, especially obesity.
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22
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Expression, function, and regulation of the embryonic transcription factor TBX1 in parathyroid tumors. J Transl Med 2017; 97:1488-1499. [PMID: 28920943 DOI: 10.1038/labinvest.2017.88] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Revised: 07/16/2017] [Accepted: 07/19/2017] [Indexed: 01/11/2023] Open
Abstract
Transcription factors active in embryonic parathyroid cells can be maintained in adult parathyroids and be involved in tumorigenesis. TBX1, the candidate gene of 22q11.2-DiGeorge syndrome, which includes congenital hypoparathyroidism, is involved in parathyroid embryogenesis. The study aimed to investigate expression, function, and regulation of the parathyroid embryonic transcription factor TBX1 in human parathyroid adult normal and tumor tissues. TBX1 transcripts were detected in normal parathyroids and were deregulated in parathyroid tumors. Using immunohistochemistry, TBX1 protein was detected, mainly at the nuclear level, in a consistent proportion of cells in normal adult parathyroids, whereas TBX1 immunoreactivity was absent in fetal parathyroids. TBX1-expressing cells were markedly reduced in about a half of adenomas (PAds) and two-thirds of carcinomas and the proportion of TBX1-expressing cells negatively correlated with the serum albumin-corrected calcium levels in the analyzed tumors. Moreover, a subset of TBX1-expressing tumor cells coexpressed PTH. TBX1 silencing in HEK293 cells, expressing endogenous TBX1, increased the proportion of cells in the G0/G1 phase of cell cycle; concomitantly, CDKN1A/p21 and CDKN2A/p16 transcripts increased and ID1 mRNA levels decreased. TBX1 silencing exerted similar effects in PAd-derived cells, suggesting cell cycle arrest. Moreover, in PAd-derived cells GCM2 and PTH mRNA levels were unaffected by TBX1 deficiency, whereas it was associated with reduction of WNT5A, an antagonist of canonical WNT/β-catenin pathway. WNT/β-catenin activation by lithium chloride inhibited TBX1 expression levels both in HEK293 and PAd-derived cells. In conclusion, TBX1 is expressed in adult parathyroid cells and deregulated in parathyroid tumors, where TBX1 deficiency may potentially contribute to the low proliferative nature of parathyroid tumors.
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23
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Cinque L, Sparaneo A, Penta L, Mencarelli A, Rogaia D, Esposito S, Fabrizio FP, Baorda F, Verrotti A, Falorni A, Stangoni G, Hendy GN, Guarnieri V, Prontera P. Autosomal Dominant PTH Gene Signal Sequence Mutation in a Family With Familial Isolated Hypoparathyroidism. J Clin Endocrinol Metab 2017; 102:3961-3969. [PMID: 28938448 DOI: 10.1210/jc.2017-00250] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 08/15/2017] [Indexed: 02/13/2023]
Abstract
CONTEXT Familial isolated hypoparathyroidism (FIH) is a genetically heterogeneous disorder due to mutations of the calcium-sensing receptor (CASR), glial cells missing-2 (GCM2), guanine nucleotide binding protein α11 (GNA11), or parathyroid hormone (PTH) genes. Thus far, only four cases with homozygous and two cases with heterozygous mutations in the PTH gene have been reported. OBJECTIVE To clinically describe an FIH family and identify and characterize the causal gene mutation. DESIGN Genomic DNA of the family members was subjected to CASR, GCM2, GNA11, and PTH gene mutational analysis. Functional assays were performed on the variant identified. PARTICIPANTS Six subjects of a three-generation FIH family with three affected individuals having severe hypocalcemia and inappropriately low serum PTH. RESULTS No mutations were detected in the CASR, GCM2, and GNA11 genes. A heterozygous variant that segregated with the disease was identified in PTH gene exon 2 (c.41T>A; p.M14K). This missense variant, in the hydrophobic core of the signal sequence, was predicted in silico to impair cleavage of preproPTH to proPTH. Functional assays in HEK293 cells demonstrated much greater retention intracellularly but impaired secretion into the medium of the M14K mutant relative to wild type. The addition of the pharmacological chaperone, 4-phenylbutyric acid, led to a reduction of cellular retention and increased accumulation in the cell medium of the M14K mutant. CONCLUSIONS We report a heterozygous PTH mutation in an FIH family and demonstrate accumulation of the mutant intracellularly and its impaired secretion. An accurate genetic diagnosis in such hypoparathyroid patients is critical for appropriate treatment and genetic counseling.
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Affiliation(s)
- Luigia Cinque
- Medical Genetics and Laboratory of Oncology, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Foggia 71013, Italy
| | - Angelo Sparaneo
- Medical Genetics and Laboratory of Oncology, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Foggia 71013, Italy
| | - Laura Penta
- Department of Pediatrics, University of Perugia, Perugia 06100, Italy
| | - Amedea Mencarelli
- Regional Reference Centre for Medical Genetics, "Santa Maria della Misericordia" Hospital, Perugia 06129, Italy
| | - Daniela Rogaia
- Regional Reference Centre for Medical Genetics, "Santa Maria della Misericordia" Hospital, Perugia 06129, Italy
| | - Susanna Esposito
- Department of Pediatrics, University of Perugia, Perugia 06100, Italy
| | - Federico Pio Fabrizio
- Medical Genetics and Laboratory of Oncology, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Foggia 71013, Italy
| | - Filomena Baorda
- Medical Genetics and Laboratory of Oncology, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Foggia 71013, Italy
| | - Alberto Verrotti
- Department of Paediatrics, University of L'Aquila, L'Aquila 67100, Italy
| | - Alberto Falorni
- Section of Internal Medicine and Endocrine and Metabolic Sciences, Department of Medicine, University of Perugia, Perugia 06100, Italy
| | - Gabriela Stangoni
- Regional Reference Centre for Medical Genetics, "Santa Maria della Misericordia" Hospital, Perugia 06129, Italy
| | - Geoffrey N Hendy
- Metabolic Disorders and Complications, McGill University Health Centre Research Institute, Montreal, Quebec H4A 3J1, Canada
- Department of Medicine, McGill University, Montreal, Quebec H4A 3J1, Canada
- Department of Physiology, McGill University, Montreal, Quebec H3G 1Y6, Canada
- Department of Human Genetics, McGill University, Montreal, Quebec H3A 0C7, Canada
| | - Vito Guarnieri
- Medical Genetics and Laboratory of Oncology, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Foggia 71013, Italy
| | - Paolo Prontera
- Regional Reference Centre for Medical Genetics, "Santa Maria della Misericordia" Hospital, Perugia 06129, Italy
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24
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Abstract
Hypoparathyroidism is a disease characterized by inadequately low circulating concentrations of parathyroid hormone (PTH) resulting in low calcium levels and increased phosphate levels in the blood. Symptoms of the disease result from increased neuromuscular irritability caused by hypocalcaemia and include tingling, muscle cramps and seizures. The most common cause of the disease is inadvertent removal of, or injury to, the parathyroid glands during neck surgery, followed by genetic, idiopathic and autoimmune aetiologies. Conventional treatment includes activated vitamin D and/or calcium supplements, but this treatment does not fully replace the functions of PTH and can lead to short-term problems (such as hypocalcaemia, hypercalcaemia and increased urinary calcium excretion) and long-term complications (which include nephrocalcinosis, kidney stones and brain calcifications). PTH replacement has emerged as a new treatment option. Clinical trials using human PTH(1-34) and PTH(1-84) showed that this treatment was safe and effective in studies lasting up to 6 years. Recombinant human PTH(1-84) has been approved in the United States and Europe for the management of hypoparathyroidism; however, its effect on long-term complications is still being evaluated. Clinical practice guidelines, which describe the consensus of experts in the field, have been published and recognize the need for more research to optimize care. In this Primer, we summarize current knowledge of the prevalence, pathophysiology, clinical presentation and management of hypoparathyroidism.
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Marchiori E, Pelizzo MR, Herten M, Townsend DM, Rubello D, Boschin IM. Specifying the molecular pattern of sporadic parathyroid tumorigenesis-The Y282D variant of the GCM2 gene. Biomed Pharmacother 2017; 92:843-848. [PMID: 28609842 DOI: 10.1016/j.biopha.2017.05.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 05/05/2017] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVE Sporadic carcinoma of the parathyroid glands is a rare malignant neoplasia. The GCM2 gene encodes a transcription factor that is crucial to embryonic parathyroid development. The Y282D variant of GCM2 exhibits increased transcriptional activity, and the presence of this variant is significantly associated with a higher prevalence of primitive hyperparathyroidism. The present study investigated the prevalence of the Y282D variant of the GCM2 gene and its association with clinical parameters in patients with a definitive histological diagnosis of sporadic parathyroid carcinoma (SPC) or atypical adenoma (AA).
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Affiliation(s)
- Elena Marchiori
- Department of Oncological Surgical and Gastroenterological Sciences (DiSCOG), University of Padova, Padova, Italy; Department of Vascular and Endovascular Surgery, University Hospital Münster, Münster, Germany.
| | - Maria Rosa Pelizzo
- Department of Oncological Surgical and Gastroenterological Sciences (DiSCOG), University of Padova, Padova, Italy
| | - Monika Herten
- Department of Vascular and Endovascular Surgery, University Hospital Münster, Münster, Germany
| | - Danyelle M Townsend
- Department of Drug Discovery and Pharmaceutical Sciences, Medical University of South Carolina, USA
| | - Domenico Rubello
- Department of Nuclear Medicine, Radiology and Clinical Pathology, Medicine, Santa Maria della Misericordia Hospital, Rovigo, Italy
| | - Isabella Merante Boschin
- Department of Oncological Surgical and Gastroenterological Sciences (DiSCOG), University of Padova, Padova, Italy
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26
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Guan B, Welch JM, Sapp JC, Ling H, Li Y, Johnston JJ, Kebebew E, Biesecker LG, Simonds WF, Marx SJ, Agarwal SK. GCM2-Activating Mutations in Familial Isolated Hyperparathyroidism. Am J Hum Genet 2016; 99:1034-1044. [PMID: 27745835 DOI: 10.1016/j.ajhg.2016.08.018] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 08/29/2016] [Indexed: 02/05/2023] Open
Abstract
Primary hyperparathyroidism (PHPT) is a common endocrine disease characterized by parathyroid hormone excess and hypercalcemia and caused by hypersecreting parathyroid glands. Familial PHPT occurs in an isolated nonsyndromal form, termed familial isolated hyperparathyroidism (FIHP), or as part of a syndrome, such as multiple endocrine neoplasia type 1 or hyperparathyroidism-jaw tumor syndrome. The specific genetic or other cause(s) of FIHP are unknown. We performed exome sequencing on germline DNA of eight index-case individuals from eight unrelated kindreds with FIHP. Selected rare variants were assessed for co-segregation in affected family members and screened for in an additional 32 kindreds with FIHP. In eight kindreds with FIHP, we identified three rare missense variants in GCM2, a gene encoding a transcription factor required for parathyroid development. Functional characterization of the GCM2 variants and deletion analyses revealed a small C-terminal conserved inhibitory domain (CCID) in GCM2. Two of the three rare variants were recurrent, located in the GCM2 CCID, and found in seven of the 40 (18%) kindreds with FIHP. These two rare variants acted as gain-of-function mutations that increased the transcriptional activity of GCM2, suggesting that GCM2 is a parathyroid proto-oncogene. Our results demonstrate that germline-activating mutations affecting the CCID of GCM2 can cause FIHP.
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Hendy GN, Canaff L. Calcium-Sensing Receptor Gene: Regulation of Expression. Front Physiol 2016; 7:394. [PMID: 27679579 PMCID: PMC5020072 DOI: 10.3389/fphys.2016.00394] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 08/23/2016] [Indexed: 12/13/2022] Open
Abstract
The human calcium-sensing receptor gene (CASR) has 8 exons, and localizes to chromosome 3q. Exons 1A and 1B encode alternative 5′-untranslated regions (UTRs) that splice to exon 2 encoding the AUG initiation codon. Exons 2–7 encode the CaSR protein of 1078 amino acids. Promoter P1 has TATA and CCAAT boxes upstream of exon 1A, and promoter P2 has Sp1/3 motifs at the start site of exon 1B. Exon 1A transcripts from the P1 promoter are reduced in parathyroid tumors and colon carcinomas. Studies of colon carcinomas and neuroblastomas have emphasized the importance of epigenetic changes—promoter methylation of the GC-rich P2 promoter, histone acetylation—as well as involvement of microRNAs in bringing about CASR gene silencing and reduced CaSR expression. Functional cis-elements in the CASR promoters responsive to 1,25-dihydroxyvitamin D [1,25(OH)2D], proinflammatory cytokines, and the transcription factor glial cells missing-2 (GCM2) have been characterized. Reduced levels of CaSR and reduced responsiveness to active vitamin D in parathyroid neoplasia and colon carcinoma may blunt the “tumor suppressor” activity of the CaSR. The hypocalcemia of critically ill patients with burn injury or sepsis is associated with CASR gene upregulation by TNF-alpha and IL-1beta via kappaB elements, and by IL-6 via Stat1/3 and Sp1/3 elements in the CASR gene promoters, respectively. The CASR is transactivated by GCM2—the expression of which is essential for parathyroid gland development. Hyperactive forms of GCM2 may contribute to later parathyroid hyperactivity or tumorigenesis. The expression of the CaSR—the calciostat—is regulated physiologically and pathophysiologically at the gene level.
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Affiliation(s)
- Geoffrey N Hendy
- Experimental Therapeutics and Metabolism, McGill University Health Centre-Research Institute, Departments of Medicine, Physiology, and Human Genetics, McGill University Montréal, QC, Canada
| | - Lucie Canaff
- Experimental Therapeutics and Metabolism, McGill University Health Centre-Research Institute, Departments of Medicine, Physiology, and Human Genetics, McGill University Montréal, QC, Canada
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28
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Astor MC, Løvås K, Debowska A, Eriksen EF, Evang JA, Fossum C, Fougner KJ, Holte SE, Lima K, Moe RB, Myhre AG, Kemp EH, Nedrebø BG, Svartberg J, Husebye ES. Epidemiology and Health-Related Quality of Life in Hypoparathyroidism in Norway. J Clin Endocrinol Metab 2016; 101:3045-53. [PMID: 27186861 PMCID: PMC4971340 DOI: 10.1210/jc.2016-1477] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 05/12/2016] [Indexed: 12/12/2022]
Abstract
OBJECTIVE The epidemiology of hypoparathyroidism (HP) is largely unknown. We aimed to determine prevalence, etiologies, health related quality of life (HRQOL) and treatment pattern of HP. METHODS Patients with HP and 22q11 deletion syndrome (DiGeorge syndrome) were identified in electronic hospital registries. All identified patients were invited to participate in a survey. Among patients who responded, HRQOL was determined by Short Form 36 and Hospital Anxiety and Depression scale. Autoantibodies were measured and candidate genes (CaSR, AIRE, GATA3, and 22q11-deletion) were sequenced for classification of etiology. RESULTS We identified 522 patients (511 alive) and estimated overall prevalence at 102 per million divided among postsurgical HP (64 per million), nonsurgical HP (30 per million), and pseudo-HP (8 per million). Nonsurgical HP comprised autosomal dominant hypocalcemia (21%), autoimmune polyendocrine syndrome type 1 (17%), DiGeorge/22q11 deletion syndrome (15%), idiopathic HP (44%), and others (4%). Among the 283 respondents (median age, 53 years [range, 9-89], 75% females), seven formerly classified as idiopathic were reclassified after genetic and immunological analyses, whereas 26 (37% of nonsurgical HP) remained idiopathic. Most were treated with vitamin D (94%) and calcium (70%), and 10 received PTH. HP patients scored significantly worse than the normative population on Short Form 36 and Hospital Anxiety and Depression scale; patients with postsurgical scored worse than those with nonsurgical HP and pseudo-HP, especially on physical health. CONCLUSIONS We found higher prevalence of nonsurgical HP in Norway than reported elsewhere. Genetic testing and autoimmunity screening of idiopathic HP identified a specific cause in 21%. Further research is necessary to unravel the causes of idiopathic HP and to improve the reduced HRQOL reported by HP patients.
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Affiliation(s)
- Marianne C Astor
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Kristian Løvås
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Aleksandra Debowska
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Erik F Eriksen
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Johan A Evang
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Christian Fossum
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Kristian J Fougner
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Synnøve E Holte
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Kari Lima
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Ragnar B Moe
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Anne Grethe Myhre
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - E Helen Kemp
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Bjørn G Nedrebø
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Johan Svartberg
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
| | - Eystein S Husebye
- Department of Clinical Science (M.C.A., K.L., E.S.H.), University of Bergen, Bergen, Norway; Department of Medicine (M.C.A., K.L., E.S.H.), Haukeland University Hospital, Bergen, Norway; Department of Medicine (A.D.), Vestfold Hospital, Tønsberg, Norway; Department of Endocrinology, Morbid Obesity and Preventive Medicine (E.F.E.), Oslo University Hospital, Oslo, Norway; Section of Specialized Endocrinology (J.A.E.), Oslo University Hospital, Rikshospitalet, Norway; Department of Medicine (C.F.), Innlandet Hospital, Gjøvik, Norway; Department of Endocrinology (K.K.F.), St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Medicine (S.E.H.), Sørlandet Hospital, Arendal, Norway; Department of Medicine (K.L.), Akershus University Hospital, University of Oslo, Oslo, Norway; Department of Medicine (R.B.M.), Østfold Hospital, Fredrikstad, Norway; Department of Pediatrics (K.L., A.G.M.), Rikshospitalet, Oslo University Hospital, Oslo, Norway; Department of Oncology and Metabolism (E.H.K.), University of Sheffield, Sheffield, UK; Department of Medicine (B.G.N.), Haugesund Hospital, Haugesund, Norway; Division of Internal Medicine (J.S.), University Hospital of North Norway, Tromsø, Norway; Institute of Clinical Medicine (J.S.), UiT The Arctic University of Norway, Tromsø, Norway
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Functional Conservation of the Glide/Gcm Regulatory Network Controlling Glia, Hemocyte, and Tendon Cell Differentiation in Drosophila. Genetics 2015; 202:191-219. [PMID: 26567182 PMCID: PMC4701085 DOI: 10.1534/genetics.115.182154] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 11/03/2015] [Indexed: 12/21/2022] Open
Abstract
High-throughput screens allow us to understand how transcription factors trigger developmental processes, including cell specification. A major challenge is identification of their binding sites because feedback loops and homeostatic interactions may mask the direct impact of those factors in transcriptome analyses. Moreover, this approach dissects the downstream signaling cascades and facilitates identification of conserved transcriptional programs. Here we show the results and the validation of a DNA adenine methyltransferase identification (DamID) genome-wide screen that identifies the direct targets of Glide/Gcm, a potent transcription factor that controls glia, hemocyte, and tendon cell differentiation in Drosophila. The screen identifies many genes that had not been previously associated with Glide/Gcm and highlights three major signaling pathways interacting with Glide/Gcm: Notch, Hedgehog, and JAK/STAT, which all involve feedback loops. Furthermore, the screen identifies effector molecules that are necessary for cell-cell interactions during late developmental processes and/or in ontogeny. Typically, immunoglobulin (Ig) domain-containing proteins control cell adhesion and axonal navigation. This shows that early and transiently expressed fate determinants not only control other transcription factors that, in turn, implement a specific developmental program but also directly affect late developmental events and cell function. Finally, while the mammalian genome contains two orthologous Gcm genes, their function has been demonstrated in vertebrate-specific tissues, placenta, and parathyroid glands, begging questions on the evolutionary conservation of the Gcm cascade in higher organisms. Here we provide the first evidence for the conservation of Gcm direct targets in humans. In sum, this work uncovers novel aspects of cell specification and sets the basis for further understanding of the role of conserved Gcm gene regulatory cascades.
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Lee S, Mannstadt M, Guo J, Kim SM, Yi HS, Khatri A, Dean T, Okazaki M, Gardella TJ, Jüppner H. A Homozygous [Cys25]PTH(1-84) Mutation That Impairs PTH/PTHrP Receptor Activation Defines a Novel Form of Hypoparathyroidism. J Bone Miner Res 2015; 30:1803-13. [PMID: 25891861 PMCID: PMC4580526 DOI: 10.1002/jbmr.2532] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 03/30/2015] [Accepted: 04/13/2015] [Indexed: 11/10/2022]
Abstract
Hypocalcemia and hyperphosphatemia are encountered in idiopathic hypoparathyroidism (IHP) and pseudohypoparathyroidism type Ib (PHP1B). In contrast to PHP1B, which is caused by resistance toward parathyroid hormone (PTH), the genetic defects leading to IHP impair production of this important regulator of mineral ion homeostasis. So far, only five PTH mutations were shown to cause IHP, each of which is located in the hormone's pre-pro leader segment and thus impair hormone secretion. In three siblings affected by IHP, we now identified a homozygous arginine-to-cysteine mutation at position 25 (R25C) of the mature PTH(1-84) polypeptide; heterozygous family members are healthy. Depending on the assay used for evaluating these patients, plasma PTH levels were either low or profoundly elevated, thus leading to ambiguities regarding the underlying diagnosis, namely IHP or PHP1B. Consistent with increased PTH levels, recombinant [Cys25]PTH(1-84) and wild-type PTH(1-84) were secreted equally well by transfected COS-7 cells. However, synthetic [Cys25]PTH(1-34) was found to have a lower binding affinity for the PTH receptor type-1 (PTH1R) than PTH(1-34) and consequently a lower efficiency for stimulating cAMP formation in cells expressing this receptor. Consistent with these in vitro findings, long-term infusion of [Cys25]PTH(1-34) resulted only in minimal calcemic and phosphaturic responses, despite readily detectable levels of [Cys25]PTH(1-34) in plasma. The mineral ion abnormalities observed in the three IHP patients are thus most likely caused by the inherited homozygous missense PTH mutation, which reduces bioactivity of the secreted hormone. Based on these findings, screening for PTH(1-84) mutations should be considered when clinical and laboratory findings are consistent with PHP1B, but GNAS methylation changes have been excluded. Differentiating between IHP and PHP1B has considerable implications for genetic counseling, therapy, and long-term outcome because treatment of IHP patients with inappropriately high doses of active vitamin D and calcium can contribute to development of nephrocalcinosis and chronic kidney disease.
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Affiliation(s)
- Sihoon Lee
- Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon, South Korea
| | - Michael Mannstadt
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Jun Guo
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Seul Min Kim
- Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon, South Korea
| | - Hyon-Seung Yi
- Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon, South Korea
| | - Ashok Khatri
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Thomas Dean
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Makoto Okazaki
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Thomas J Gardella
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Harald Jüppner
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.,Pediatric Nephrology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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Han SI, Tsunekage Y, Kataoka K. Gata3 cooperates with Gcm2 and MafB to activate parathyroid hormone gene expression by interacting with SP1. Mol Cell Endocrinol 2015; 411:113-20. [PMID: 25917456 DOI: 10.1016/j.mce.2015.04.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 04/17/2015] [Accepted: 04/19/2015] [Indexed: 11/21/2022]
Abstract
Haploinsufficiency of the Gata3 gene, which encodes a zinc-finger transcription factor, is associated with the disorder hypoparathyroidism, deafness, and renal dysplasia (HDR) syndrome in humans. However, the roles of Gata3 in transcriptional regulation in the parathyroid glands are not well-understood. In this study, we show that Gata3 activates transcription of parathyroid hormone (PTH), which is secreted from parathyroid glands and is critical for regulating serum calcium and phosphate homeostasis. Gata3 interacted with Gcm2 and MafB, two known transcriptional regulators of parathyroid development, and synergistically stimulated the PTH promoter. An SP1-binding element (GC box) located within the PTH-promoter proximal region was critical for activating transcription by Gata3. In addition, the ubiquitous transcription factor SP1 also interacted with Gata3 as well as MafB and Gcm2, and HDR syndrome-associated Gata3 mutants were defective in activating the PTH promoter. These results suggest that Gata3 is a critical regulator of PTH gene expression.
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Affiliation(s)
- Song-Iee Han
- Laboratory of Molecular Medical Bioscience, Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan
| | - Yukino Tsunekage
- Laboratory of Molecular Medical Bioscience, Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan
| | - Kohsuke Kataoka
- Laboratory of Molecular Medical Bioscience, Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan.
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Abstract
Phosphate is essential for growth and maintenance of the skeleton and for generating high-energy phosphate compounds. Evolutionary adaptation to high dietary phosphorous in humans and other terrestrial vertebrates involves regulated mechanisms assuring the efficient renal elimination of excess phosphate. These mechanisms prominently include PTH, FGF23, and Vitamin D, which directly and indirectly regulate phosphate transport. Disordered phosphate homeostasis is associated with pathologies ranging from kidney stones to kidney failure. Chronic kidney disease results in hyperphosphatemia, an elevated calcium×phosphate product with considerable morbidity and mortality, mostly associated with adverse cardiovascular events. This chapter highlights recent findings and insights regarding the hormonal regulation of renal phosphate transport along with imbalances of phosphate balance due to acquired or inherited diseases states.
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Eyal O, Oren A, Jüppner H, Somech R, De Bellis A, Mannstadt M, Szalat A, Bleiberg M, Weisman Y, Weintrob N. Hypoparathyroidism and central diabetes insipidus: in search of the link. Eur J Pediatr 2014; 173:1731-4. [PMID: 25367057 PMCID: PMC5103624 DOI: 10.1007/s00431-014-2448-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 10/13/2014] [Accepted: 10/20/2014] [Indexed: 11/24/2022]
Abstract
UNLABELLED Two siblings (a 15-year-old boy and an 11-year-old girl) who presented with hypocalcemic seizure at the age of 2 years and 2 months (boy) and 2 years and 4 months (girl) were diagnosed with hypoparathyroidism. At the age of 3 years, the girl developed central diabetes insipidus with good response to desmopressin acetate treatment. The family history was unremarkable, and there was no consanguinity between the parents. The father is of Iraqi/Egyptian Jewish origin and the mother is of Iranian/Romanian Jewish origin. Sequence analysis of the candidate genes for isolated hypoparathyroidism encoding calcium-sensing receptor, parathyroid hormone, and glial cells missing homolog B did not reveal any mutations. Whole-exome sequencing identified a homozygous mutation in the autoimmune regulatory gene (AIRE), c.374A>G;p.Y85C, characteristic for Jewish Iranians with autoimmune polyendocrine syndrome type 1 (APS1), which was confirmed by the Sanger sequencing. Antibodies against the adrenal, pancreatic islet cell, ovary, thyroid, pituitary, celiac, and parietal cell were negative in both siblings, while anti-diuretic hormone antibodies were positive only in the girl. No other symptoms or signs of APS1 developed during all the years of follow-up. CONCLUSION APS1 should be part of the differential diagnosis in children presenting with isolated hypoparathyroidism or hypoparathyroidism with central diabetes insipidus (CDI). These cases show that the AIRE mutation characteristic of Iranian Jews can also be found in non-Iranian Jews.
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Affiliation(s)
- Ori Eyal
- Pediatric Endocrinology and Diabetes Unit, Dana-Dwek Children Hospital, Tel Aviv Sourasky Medical Center, 6 Weizmann St., 6423906 Tel Aviv, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Asaf Oren
- Pediatric Endocrinology and Diabetes Unit, Dana-Dwek Children Hospital, Tel Aviv Sourasky Medical Center, 6 Weizmann St., 6423906 Tel Aviv, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Harald Jüppner
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Raz Somech
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Cancer Research Center, Pediatric Department, Pediatric Immunology Service, Jeffery Modell Foundation (JMF) Center, Edmond and Lily Safra Children’s Hospital, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Annamaria De Bellis
- Department of Cardiothoracic and Respiratory Sciences, Section of Endocrinology, Faculty of Medicine and Surgery, Second University of Naples, Naples, Italy
| | - Michael Mannstadt
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Auryan Szalat
- Internal Medicine Department, Endocrinology and Metabolism Service, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Margalit Bleiberg
- Clinical Immunology Laboratory, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Yosef Weisman
- Pediatric Endocrinology and Diabetes Unit, Dana-Dwek Children Hospital, Tel Aviv Sourasky Medical Center, 6 Weizmann St., 6423906 Tel Aviv, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Naomi Weintrob
- Pediatric Endocrinology and Diabetes Unit, Dana-Dwek Children Hospital, Tel Aviv Sourasky Medical Center, 6 Weizmann St., 6423906 Tel Aviv, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Abstract
Recent studies of inherited disorders of phosphate metabolism have shed new light on the understanding of phosphate metabolism. Phosphate has important functions in the body and several mechanisms have evolved to regulate phosphate balance including vitamin D, parathyroid hormone and phosphatonins such as fibroblast growth factor-23 (FGF23). Disorders of phosphate homeostasis leading to hypo- and hyperphosphataemia are common and have clinical and biochemical consequences. Notably, recent studies have linked hyperphosphataemia with an increased risk of cardiovascular disease. This review outlines the recent advances in the understanding of phosphate homeostasis and describes the causes, investigation and management of hypo- and hyperphosphataemia.
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Affiliation(s)
- P Manghat
- Department of Chemical Pathology, Darent Valley Hospital, Dartford, UK
| | - R Sodi
- Department of Biochemistry, NHS Lanarkshire, East Kilbride, UK
| | - R Swaminathan
- Department of Chemical Pathology, St. Thomas Hospital, London, UK
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Generation of mice encoding a conditional null allele of Gcm2. Transgenic Res 2014; 23:631-41. [PMID: 24736975 DOI: 10.1007/s11248-014-9799-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 04/04/2014] [Indexed: 10/25/2022]
Abstract
Glial cells missing homolog 2 (GCM2) is a transcription factor that is expressed predominately in the pharyngeal pouches and, at later stages, in the developing and mature parathyroid glands. In humans, loss of GCM2 function, either through recessive apomorphic mutations or dominant inhibitor mutations in the human GCM2 gene, leads to isolated hypoparathyroidism. In mice, homozygous disruption of Gcm2 by conventional gene targeting results in parathyroid aplasia and hypoparathyroidism. In this study, we report the generation and functional characterization of mice encoding a conditional null allele of Gcm2. We demonstrate the functional integrity of the conditional Gcm2 allele and report successful in vivo deletion of exon 2 using Cre recombinase. The mice with conditional deletion of Gcm2 displayed phenotypes similar to those previously described for a conventional Gcm2 knockout, including perinatal lethality, hypocalemia, low or undetectable serum levels of parathyroid hormone, and absent parathyroid glands. The production of a conditional mutant allele for Gcm2 represents a valuable resource for the study of the temporal- and spatial-specific roles for Gcm2, and for understanding the postnatal activities of GCM2 protein.
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Ricketts CJ, Morris MR, Gentle D, Shuib S, Brown M, Clarke N, Wei W, Nathan P, Latif F, Maher ER. Methylation profiling and evaluation of demethylating therapy in renal cell carcinoma. Clin Epigenetics 2013; 5:16. [PMID: 24034811 PMCID: PMC3848591 DOI: 10.1186/1868-7083-5-16] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 08/21/2013] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Despite therapeutic advances in targeted therapy, metastatic renal cell carcinoma (RCC) remains incurable for the vast majority of patients. Key molecular events in the pathogenesis of RCC include inactivation of the VHL tumour suppressor gene (TSG), inactivation of chromosome 3p TSGs implicated in chromatin modification and remodelling and de novo tumour-specific promoter methylation of renal TSGs. In the light of these observations it can be proposed that, as in some haematological malignancies, demethylating agents such as azacitidine might be beneficial for the treatment of advanced RCC. RESULTS Here we report that the treatment of RCC cell lines with azacitidine suppressed cell proliferation in all 15 lines tested. A marked response to azacitidine therapy (>50% reduction in colony formation assay) was detected in the three cell lines with VHL promoter methylation but some RCC cell lines without VHL TSG methylation also demonstrated a similar response suggesting that multiple methylated TSGs might determine the response to demethylating therapies. To identify novel candidate methylated TSGs implicated in RCC we undertook a combined analysis of copy number and CpG methylation array data. Candidate novel epigenetically inactivated TSGs were further prioritised by expression analysis of RCC cell lines pre and post-azacitidine therapy and comparative expression analysis of tumour/normal pairs. Thus, with subsequent investigation two candidate genes were found to be methylated in more than 25% of our series and in the TCGA methylation dataset for 199 RCC samples: RGS7 (25.6% and 35.2% of tumours respectively) and NEFM in (25.6% and 30.2%). In addition three candidate genes were methylated in >10% of both datasets (TMEM74 (15.4% and 14.6%), GCM2 (41.0% and 14.6%) and AEBP1 (30.8% and 13.1%)). Methylation of GCM2 (P = 0.0324), NEFM (P = 0.0024) and RGS7 (P = 0.0067) was associated with prognosis. CONCLUSIONS These findings provide preclinical evidence that treatment with demethylating agents such as azacitidine might be useful for the treatment of advanced RCC and further insights into the role of epigenetic changes in the pathogenesis of RCC.
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Affiliation(s)
- Christopher J Ricketts
- Centre for Rare Diseases and Personalised Medicine, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK
| | - Mark R Morris
- Centre for Rare Diseases and Personalised Medicine, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK
- School of Applied Sciences University of Wolverhampton, Wolverhampton WV1 1SV, UK
| | - Dean Gentle
- Centre for Rare Diseases and Personalised Medicine, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK
| | - Salwati Shuib
- Centre for Rare Diseases and Personalised Medicine, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK
- Department of Pathology, Universiti Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, 56000, Kuala Lumpur, Malaysia
| | - Michael Brown
- Institute for Cancer Sciences, Cancer Research UK Paterson Institute for Cancer Research, Manchester Academic Health Science Centre, University of Manchester, Manchester M20 4BX, UK
| | - Noel Clarke
- Institute for Cancer Sciences, Cancer Research UK Paterson Institute for Cancer Research, Manchester Academic Health Science Centre, University of Manchester, Manchester M20 4BX, UK
- The Christie Hospital, Wilmslow Road, Manchester M20 4BX, UK
| | - Wenbin Wei
- School of Cancer Sciences, University of Birmingham, Birmingham, UK
| | - Paul Nathan
- Mount Vernon Cancer Centre - Medical Oncology, Rickmansworth Road, Northwood, Middlesex HA6 2RN, UK
| | - Farida Latif
- Centre for Rare Diseases and Personalised Medicine, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK
| | - Eamonn R Maher
- Centre for Rare Diseases and Personalised Medicine, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK
- West Midlands Region Genetics Service, Birmingham Women’s Hospital, Edgbaston, Birmingham B15 2TG, UK
- Department of Medical Genetics, University of Cambridge, Addenbrooke’s Treatment Centre, Cambridge Biomedical Research Campus, Cambridge CB2 0QQ, UK
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Hendy GN, Canaff L, Cole DEC. The CASR gene: alternative splicing and transcriptional control, and calcium-sensing receptor (CaSR) protein: structure and ligand binding sites. Best Pract Res Clin Endocrinol Metab 2013; 27:285-301. [PMID: 23856260 DOI: 10.1016/j.beem.2013.02.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The calcium-sensing receptor (CaSR) is a G protein-coupled receptor encoded by a single copy gene. The human CASR gene spans ~103-kb and has eight exons. Promoters P1 and P2 drive transcription of exons 1A and 1B, respectively, encoding alternative 5'-UTRs that splice to exon 2 encoding the common part of the 5'-UTR. Exons 2-7 encode the CaSR protein of 1078 amino acids. Functional elements responsive to 1,25-dihydroxyvitamin D, proinflammatory cytokines, and glial cells missing-2 are present in the CASR promoters. Evolutionarily, the exon structure, first seen in aquatic vertebrates, is well-conserved with a single linkage disequilibrium haplotype block for protein coding exons 2-7. Structural features of the human CaSR protein are: an N-terminal signal peptide (19 amino acids (aa)); an extracellular domain (~600 aa) having a bi-lobed Venus Flytrap (VFT) domain with several Ca(2+)-binding sites; and a nine-cysteines domain that transduces the activation signal to the 7-transmembrane domain (250 aa) and the C-terminal tail (216 aa).
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Affiliation(s)
- Geoffrey N Hendy
- Calcium Research Laboratory, and Hormones and Cancer Research Unit, Royal Victoria Hospital and McGill University Health Centre, Montreal, QC H3A 1A1, Canada.
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Yi HS, Eom YS, Park IB, Lee S, Hong S, Jüppner H, Mannstadt M, Lee S. Identification and characterization of C106R, a novel mutation in the DNA-binding domain of GCMB, in a family with autosomal-dominant hypoparathyroidism. Clin Endocrinol (Oxf) 2012; 76:625-33. [PMID: 22066718 PMCID: PMC3701386 DOI: 10.1111/j.1365-2265.2011.04256.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OVERVIEW Glial cells missing B (GCMB) is a transcription factor that is expressed in the parathyroid hormone (PTH)-secreting cells of the parathyroid glands. Several mutations in GCMB have been reported to cause hypoparathyroidism (HP). We identified a family with two individuals in two generations (mother and son), who are affected by autosomal-dominant hypoparathyroidism (AD-HP). A novel heterozygous mutation in exon 2 of GCMB was identified in both affected individuals that changes cysteine at position 106 of the putative DNA-binding domain of GCMB to arginine (C106R). METHODS We performed mutational analysis of the genes encoding GCMB, pre-pro PTH, GATA3 and CaSR using polymerase chain reaction (PCR)-amplified genomic DNA. The identified GCMB mutant was characterized by functional studies including nuclear localization, electrophoretic mobility shift assays (EMSA) and luciferase reporter assays, and homology modelling was performed to generate a three-dimensional structural model for the DNA-binding domain of GCMB to predict the structural consequences of the identified mutation. RESULTS The C106R mutant of GCMB failed to interact with the DNA consensus recognition motif, as determined by EMSA. Furthermore, in comparison with wild-type GCMB, the C106R mutant demonstrated reduced transactivation in luciferase reporter assays; however, the mutant GCMB failed to reduce the activity of the wild-type protein. Consistent with the EMSA findings, homology modelling analysis suggested that replacement of cysteine 106 with arginine would interfere with DNA binding. CONCLUSIONS We have identified a novel GCMB mutation that may explain AD-HP in our family. However, the exact mechanism by which this heterozygous mutation leads to the disease in the described family remains to be elucidated.
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Affiliation(s)
- Hyon-Seung Yi
- Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon
| | - Young Sil Eom
- Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon
| | - Ie Byung Park
- Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon
| | - Sangho Lee
- Department of Biological Sciences, Sungkyunkwan University, Suwon
| | - Suntaek Hong
- Laboratory of Cancer Cell Biology, Lee Gil Ya Cancer and Diabetes Institute, Gachon University of Medicine and Science, Incheon, Korea
| | - Harald Jüppner
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Pediatric Nephrology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Michael Mannstadt
- Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Sihoon Lee
- Department of Internal Medicine and Laboratory of Molecular Endocrinology, Gachon University School of Medicine, Incheon
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Grigorieva IV, Thakker RV. Transcription factors in parathyroid development: lessons from hypoparathyroid disorders. Ann N Y Acad Sci 2012; 1237:24-38. [PMID: 22082362 DOI: 10.1111/j.1749-6632.2011.06221.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Parathyroid developmental anomalies, which result in hypoparathyroidism, are common and may occur in one in 4,000 live births. Parathyroids, in man, develop from the endodermal cells of the third and fourth pharyngeal pouches, whereas, in the mouse they develop solely from the endoderm of the third pharyngeal pouches. In addition, neural crest cells that arise from the embryonic mid- and hindbrain also contribute to parathyroid gland development. The molecular signaling pathways that are involved in determining the differentiation of the pharyngeal pouch endoderm into parathyroid cells are being elucidated by studies of patients with hypoparathyroidism and appropriate mouse models. These studies have revealed important roles for a number of transcription factors, which include Tbx1, Gata3, Gcm2, Sox3, Aire1 and members of the homeobox (Hox) and paired box (Pax) families.
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Affiliation(s)
- Irina V Grigorieva
- Academic Endocrine Unit, Nuffield Department of Clinical Medicine, Oxford Centre for Diabetes, Endocrinology, and Metabolism, Churchill Hospital, University of Oxford, Headington, Oxford, United Kingdom
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Doyle D, Kirwin SM, Sol-Church K, Levine MA. A novel mutation in the GCM2 gene causing severe congenital isolated hypoparathyroidism. J Pediatr Endocrinol Metab 2012; 25:741-6. [PMID: 23155703 PMCID: PMC3694175 DOI: 10.1515/jpem-2012-0080] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE To investigate the GCM2 gene in three siblings with congenital hypoparathyroidism and perform functional analysis. MATERIALS AND METHODS We sequenced the GCM2 gene by PCR and analyzed the functional consequence of the mutation by transient transfection studies. Haplotype analysis was performed. RESULTS We identified a nucleotide change, c.408C>A, in exon 3 that is predicted to truncate the Gcm2 protein (p.Tyr136Ter). All three affected siblings were homozygous and both parents were heterozygous for the mutation. Transfection studies revealed the mutant mRNA but not expression of the Gcm2 protein. Haplotype analysis revealed that the two mutant GCM2 alleles shared genotypes on chromosome 6p24.2. CONCLUSIONS We describe the first GCM2 mutation in exon 3 in patients with severe congenital hypoparathyroidism. Informative genetic markers could not exclude identity by descent for the mutant alleles. Gcm2 protein was not detected after transfection, suggesting that complete lack of Gcm2 action accounts for severe hypoparathyroidism.
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Affiliation(s)
- Daniel Doyle
- Division of Endocrinology, Nemours/Alfred I. duPont Hospital for Children, P.O. Box 269, Wilmington, DE 19803, USA.
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Bilezikian JP, Khan A, Potts JT, Brandi ML, Clarke BL, Shoback D, Jüppner H, D'Amour P, Fox J, Rejnmark L, Mosekilde L, Rubin MR, Dempster D, Gafni R, Collins MT, Sliney J, Sanders J. Hypoparathyroidism in the adult: epidemiology, diagnosis, pathophysiology, target-organ involvement, treatment, and challenges for future research. J Bone Miner Res 2011; 26:2317-37. [PMID: 21812031 PMCID: PMC3405491 DOI: 10.1002/jbmr.483] [Citation(s) in RCA: 319] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Recent advances in understanding the epidemiology, genetics, diagnosis, clinical presentations, skeletal involvement, and therapeutic approaches to hypoparathyroidism led to the First International Workshop on Hypoparathyroidism that was held in 2009. At this conference, a group of experts convened to discuss these issues with a view towards a future research agenda for this disease. This review, which focuses primarily on hypoparathyroidism in the adult, provides a comprehensive summary of the latest information on this disease.
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Affiliation(s)
- John P Bilezikian
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
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Kamitani-Kawamoto A, Hamada M, Moriguchi T, Miyai M, Saji F, Hatamura I, Nishikawa K, Takayanagi H, Hitoshi S, Ikenaka K, Hosoya T, Hotta Y, Takahashi S, Kataoka K. MafB interacts with Gcm2 and regulates parathyroid hormone expression and parathyroid development. J Bone Miner Res 2011; 26:2463-72. [PMID: 21713993 DOI: 10.1002/jbmr.458] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Serum calcium and phosphate homeostasis is critically regulated by parathyroid hormone (PTH) secreted by the parathyroid glands. Parathyroid glands develop from the bilateral parathyroid-thymus common primordia. In mice, the expression of transcription factor Glial cell missing 2 (Gcm2) begins in the dorsal/anterior part of the primordium on embryonic day 9.5 (E9.5), specifying the parathyroid domain. The parathyroid primordium then separates from the thymus primordium and migrates to its adult location beside the thyroid gland by E15.5. Genetic ablation of gcm2 results in parathyroid agenesis in mice, indicating that Gcm2 is essential for early parathyroid organogenesis. However, the regulation of parathyroid development at later stages is not well understood. Here we show that transcriptional activator v-maf musculoaponeurotic fibrosarcoma oncogene homologue B (MafB) is developmentally expressed in parathyroid cells after E11.5. MafB expression was lost in the parathyroid primordium of gcm2 null mice. The parathyroid glands of mafB(+/-) mice were mislocalized between the thymus and thyroid. In mafB(-/-) mice, the parathyroid did not separate from the thymus. Furthermore, in mafB(-/-) mice, PTH expression and secretion were impaired; expression levels of renal cyp27b1, one of the target genes of PTH, was decreased; and bone mineralization was reduced. We also demonstrate that although Gcm2 alone does not stimulate the PTH gene promoter, it associates with MafB to synergistically activate PTH expression. Taken together, our results suggest that MafB regulates later steps of parathyroid development, that is, separation from the thymus and migration toward the thyroid. MafB also regulates the expression of PTH in cooperation with Gcm2.
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Affiliation(s)
- Akiyo Kamitani-Kawamoto
- Laboratory of Molecular and Developmental Biology, Graduate School of Biological Science, Nara Institute of Science and Technology, Ikoma, Japan
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Mannstadt M, Holick E, Zhao W, Jüppner H. Mutational analysis of GCMB, a parathyroid-specific transcription factor, in parathyroid adenoma of primary hyperparathyroidism. J Endocrinol 2011; 210:165-71. [PMID: 21642377 PMCID: PMC3689587 DOI: 10.1530/joe-10-0247] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Sporadic primary hyperparathyroidism (PHPT), one of the most common endocrine disorders, is characterized by hypercalcemia and elevated PTH levels. The majority of cases are caused by a benign parathyroid adenoma, but somatic or de novo germ-line mutations that lead to adenoma formation have only been identified in few glands. GCMB is a parathyroid-specific transcription factor, which causes hypoparathyroidism when inactivated on both parental alleles or when a dominant-negative, heterozygous mutation is present. It is overexpressed in some parathyroid adenomas, and we therefore tested the hypothesis that GCMB mutations can be a cause of parathyroid adenomas. Nucleotide sequence analysis was performed on all coding exons and exon-intron borders of GCMB in 30 sporadic parathyroid adenomas and we identified several known polymorphisms that were either heterozygous or homozygous. In addition, one of the 30 investigated glands revealed a novel heterozygous missense mutation, c.1144G>A, which introduced methionine at position 382 for valine (V382M), a conserved amino acid residue. Western blot analysis using mutant GCMB (GCMB-V382M) from lysates of transiently transfected DF-1 fibroblasts, luciferase assays using extracts from these cells, and electrophoretic mobility assays failed to reveal differences between wild-type and mutant GCMB in expression level, transactivational capacity, and DNA-binding ability. Furthermore, pulse-chase experiments demonstrated no difference in half-life of wild-type and mutant protein. We conclude that mutations in the transcription factor GCMB do not seem to play a major role in the pathogenesis of PHPT.
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Affiliation(s)
- Michael Mannstadt
- Endocrine Unit Pediatric Nephrology Unit, Massachusetts General Hospital and Harvard Medical School, Thier 1051, 55 Fruit Street, Boston, Massachusetts 02114, USA.
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Turan S, Akin L, Akcay T, Adal E, Sarikaya S, Bastepe M, Jüppner H. Recessive versus imprinted disorder: consanguinity can impede establishing the diagnosis of autosomal dominant pseudohypoparathyroidism type Ib. Eur J Endocrinol 2010; 163:489-93. [PMID: 20538864 PMCID: PMC2990771 DOI: 10.1530/eje-10-0348] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Hypocalcemia and hyperphosphatemia with low/normal parathyroid hormone (PTH) levels can be observed in hypoparathyroidism (HP), a disorder that may follow an autosomal dominant (AD) or autosomal recessive (AR) mode of inheritance. Similar biochemical changes are also observed in pseudohypoparathyroidism (PHP) type Ia and Ib, but affected patients usually show elevated PTH levels indicative of hormonal resistance. Features of Albright's hereditary osteodystrophy (AHO) are typically not observed in patients affected by familial forms of PHP-Ib, which are most frequently caused by maternally inherited, heterozygous microdeletions within STX16 and are associated with isolated loss of methylation at GNAS exon A/B. We established the molecular defect in two children of consanguineous Turkish parents, who presented with hypocalcemia, hyperphosphatemia, and low 25-OH vitamin D levels, but initially normal or only mildly elevated PTH levels, i.e. findings that do not readily exclude HP. After normalizing serum magnesium levels, hypocalcemia and hyperphosphatemia persisted, and PTH levels increased, suggesting PTH resistance rather than PTH deficiency. Because of the absence of AHO and parental consanguinity, an AR form of PHP-Ib appeared plausible, which had previously been suggested for sporadic cases. However, loss of GNAS methylation was restricted to exon A/B, which led to the identification of the 3-kb STX16 microdeletion. The same mutation was also detected in the healthy mother, who did not show any GNAS methylation abnormality, indicating that her deletion resides on the paternal allele. Our findings emphasize the importance of considering a parentally imprinted, AD disorder even if consanguinity suggests an AR mode of inheritance.
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Affiliation(s)
- Serap Turan
- Endocrine Unit Pediatric Nephrology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA.
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Mirczuk SM, Bowl MR, Nesbit MA, Cranston T, Fratter C, Allgrove J, Brain C, Thakker RV. A missense glial cells missing homolog B (GCMB) mutation, Asn502His, causes autosomal dominant hypoparathyroidism. J Clin Endocrinol Metab 2010; 95:3512-6. [PMID: 20463099 DOI: 10.1210/jc.2009-2532] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT Glial cells missing B (GCMB), the mammalian homolog of the Drosophila GCM gene, encodes a 506-amino-acid parathyroid-specific transcription factor. To date, only two different heterozygous GCMB mutations have been reported in three kindreds with autosomal dominant hypoparathyroidism. OBJECTIVE Our objective was to investigate a family with autosomal dominant hypoparathyroidism for PTH, CaSR, and GCMB mutations. METHODS Leukocyte DNA was used with exon-specific primers for PCR amplification and the DNA sequences of the PCR products determined. Functional analyses using fluorescence microscopy, EMSAs, and luciferase reporter assays were undertaken. Informed consent was obtained using protocols approved by a national ethical committee. RESULTS DNA sequence analysis revealed an A to C transversion at codon 502 of GCMB, which altered the wild-type asparagine (Asn) to histidine (His). Functional studies, using transient transfections of COS7 cells with GCMB wild-type and mutant (Asn502His) tagged constructs, demonstrated that the wild-type and mutant proteins localized to the nucleus and retained the ability to bind the GCM-consensus DNA recognition motif. However, a luciferase reporter assay demonstrated that the Asn502His mutation resulted in a reduction in gene transactivation. Moreover, cotransfection of the wild-type with mutant did not lead to an increase in luciferase activity, thereby demonstrating a dominant-negative effect of the Asn502His mutant that would be consistent with an autosomal dominant inheritance. CONCLUSION Our results, which have identified the first dominant missense GCMB mutation, help to increase our understanding of the mechanism underlying gene transactivation that is a prerequisite for the function of this parathyroid gland-specific transcription factor.
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Affiliation(s)
- Samantha M Mirczuk
- Academic Endocrine Unit, Nuffield Department of Clinical Medicine, University of Oxford, Oxford Centre for Diabetes, Endocrinology, and Metabolism (OCDEM), Churchill Hospital, Headington Oxford OX3 7LJ, UK
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Affiliation(s)
- Dominique Prié
- Growth and Signaling Research Center and the Department of Physiology, INSERM Unité 845, Paris Descartes University, Paris, France
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Bowl MR, Mirczuk SM, Grigorieva IV, Piret SE, Cranston T, Southam L, Allgrove J, Bahl S, Brain C, Loughlin J, Mughal Z, Ryan F, Shaw N, Thakker YV, Tiosano D, Nesbit MA, Thakker RV. Identification and characterization of novel parathyroid-specific transcription factor Glial Cells Missing Homolog B (GCMB) mutations in eight families with autosomal recessive hypoparathyroidism. Hum Mol Genet 2010; 19:2028-38. [PMID: 20190276 DOI: 10.1093/hmg/ddq084] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
GCMB is a member of the small transcription factor family GCM (glial cells missing), which are important regulators of development, present in vertebrates and some invertebrates. In man, GCMB encodes a 506 amino acid parathyroid gland-specific protein, mutations of which have been reported to cause both autosomal dominant and autosomal recessive hypoparathyroidism. We ascertained 18 affected individuals from 12 families with autosomal recessive hypoparathyroidism and have investigated them for GCMB abnormalities. Four different homozygous germline mutations were identified in eight families that originate from the Indian Subcontinent. These consisted of a novel nonsense mutation R39X; a missense mutation, R47L in two families; a novel missense mutation, R110W; and a novel frameshifting deletion, I298fsX307 in four families. Haplotype analysis, using polymorphic microsatellites from chromosome 6p23-24, revealed that R47L and I298fsX307 mutations arose either as ancient founders, or recurrent de novo mutations. Functional studies including: subcellular localization studies, EMSAs and luciferase-reporter assays, were undertaken and these demonstrated that: the R39X mutant failed to localize to the nucleus; the R47L and R110W mutants both lost DNA-binding ability; and the I298fsX307 mutant had reduced transactivational ability. In order to gain further insights, we undertook 3D-modeling of the GCMB DNA-binding domain, which revealed that the R110 residue is likely important for the structural integrity of helix 2, which forms part of the GCMB/DNA binding interface. Thus, our results, which expand the spectrum of hypoparathyroidism-associated GCMB mutations, help elucidate the molecular mechanisms underlying DNA-binding and transactivation that are required for this parathyroid-specific transcription factor.
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Affiliation(s)
- Michael R Bowl
- Academic Endocrine Unit, Nuffield Department of Clinical Medicine, Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Headington, Oxford OX3 7LJ, UK
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Hendy GN, Guarnieri V, Canaff L. Chapter 3 Calcium-Sensing Receptor and Associated Diseases. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2009; 89:31-95. [DOI: 10.1016/s1877-1173(09)89003-0] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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