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Robinson-Cohen C, Lutsey PL, Kleber ME, Nielson CM, Mitchell BD, Bis JC, Eny KM, Portas L, Eriksson J, Lorentzon M, Koller DL, Milaneschi Y, Teumer A, Pilz S, Nethander M, Selvin E, Tang W, Weng LC, Wong HS, Lai D, Peacock M, Hannemann A, Völker U, Homuth G, Nauk M, Murgia F, Pattee JW, Orwoll E, Zmuda JM, Riancho JA, Wolf M, Williams F, Penninx B, Econs MJ, Ryan KA, Ohlsson C, Paterson AD, Psaty BM, Siscovick DS, Rotter JI, Pirastu M, Streeten E, März W, Fox C, Coresh J, Wallaschofski H, Pankow JS, de Boer IH, Kestenbaum B. Genetic Variants Associated with Circulating Parathyroid Hormone. J Am Soc Nephrol 2017; 28:1553-1565. [PMID: 27927781 PMCID: PMC5407713 DOI: 10.1681/asn.2016010069] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 10/13/2016] [Indexed: 12/19/2022] Open
Abstract
Parathyroid hormone (PTH) is a primary calcium regulatory hormone. Elevated serum PTH concentrations in primary and secondary hyperparathyroidism have been associated with bone disease, hypertension, and in some studies, cardiovascular mortality. Genetic causes of variation in circulating PTH concentrations are incompletely understood. We performed a genome-wide association study of serum PTH concentrations among 29,155 participants of European ancestry from 13 cohort studies (n=22,653 and n=6502 in discovery and replication analyses, respectively). We evaluated the association of single nucleotide polymorphisms (SNPs) with natural log-transformed PTH concentration adjusted for age, sex, season, study site, and principal components of ancestry. We discovered associations of SNPs from five independent regions with serum PTH concentration, including the strongest association with rs6127099 upstream of CYP24A1 (P=4.2 × 10-53), a gene that encodes the primary catabolic enzyme for 1,25-dihydroxyvitamin D and 25-dihydroxyvitamin D. Each additional copy of the minor allele at this SNP associated with 7% higher serum PTH concentration. The other SNPs associated with serum PTH concentration included rs4074995 within RGS14 (P=6.6 × 10-17), rs219779 adjacent to CLDN14 (P=3.5 × 10-16), rs4443100 near RTDR1 (P=8.7 × 10-9), and rs73186030 near CASR (P=4.8 × 10-8). Of these five SNPs, rs6127099, rs4074995, and rs219779 replicated. Thus, common genetic variants located near genes involved in vitamin D metabolism and calcium and renal phosphate transport associated with differences in circulating PTH concentrations. Future studies could identify the causal variants at these loci, and the clinical and functional relevance of these variants should be pursued.
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Affiliation(s)
- Cassianne Robinson-Cohen
- Division of Nephrology, Department of Medicine, Kidney Research Institute,
- Department of Epidemiology, University of Washington School of Public Health, Seattle, Washington
| | | | - Marcus E Kleber
- Vth Department of Medicine, Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany
| | - Carrie M Nielson
- Department of Public Health and Preventive Medicine, Oregon Health & Science University, Portland, Oregon
| | - Braxton D Mitchell
- Department of Medicine and Program for Personalized and Genomic Medicine, University of Maryland School of Medicine, Baltimore, Maryland
- Geriatric Research and Education Clinical Center, Veterans Administration Medical Center, Baltimore, Maryland
| | - Joshua C Bis
- Cardiovascular Health Research Unit, Department of Medicine, and
| | - Karen M Eny
- Program in Genetics & Genome Biology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Laura Portas
- Institute of Population Genetics, National Research Council of Italy, Rome, Italy
| | - Joel Eriksson
- Department of Internal Medicine and Clinical Nutrition, Centre for Bone and Arthritis Research, and
| | - Mattias Lorentzon
- Department of Internal Medicine and Clinical Nutrition, Centre for Bone and Arthritis Research, and
| | | | - Yuri Milaneschi
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, Vrije Universiteit Medical Center/GGZ inGeest, Amsterdam, The Netherlands
| | - Alexander Teumer
- Institutes for Community Medicine, Department Study of Health in Pomerania - Klinisch-Epidemiologische Forschung (SHIP-KEF), and
| | - Stefan Pilz
- Department of Epidemiology and Biostatistics, EMGO Institute for Health and Care Research, Vrije Universiteit Medical Center, Amsterdam, The Netherlands
- Department of Internal Medicine, Division of Endocrinology and Nuclear Medicine, and
| | - Maria Nethander
- Bioinformatics Core Facility, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Elizabeth Selvin
- Department of Epidemiology, Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Weihong Tang
- Divisions of Epidemiology and Community Health and
| | - Lu-Chen Weng
- Divisions of Epidemiology and Community Health and
| | - Hoi Suen Wong
- Program in Genetics & Genome Biology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Dongbing Lai
- Departments of Medical and Molecular Genetics and
| | | | | | - Uwe Völker
- Department of Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany
| | - Georg Homuth
- Department of Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany
| | | | - Federico Murgia
- Institute of Population Genetics, National Research Council of Italy, Rome, Italy
| | - Jack W Pattee
- Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota
| | - Eric Orwoll
- Department of Public Health and Preventive Medicine, Oregon Health & Science University, Portland, Oregon
| | - Joseph M Zmuda
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Jose Antonio Riancho
- Department of Medicine, University of Cantabria, and Hospital Universitario Marques de Valdecilla, Insituto de Investigacion Sanitaria, Santander, Spain
| | - Myles Wolf
- Division of Nephrology and Hypertension, Department of Medicine and
- Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Frances Williams
- Department of Twin Research and Genetic Epidemiology, Division of Genetics & Molecular Medicine, King's College, London, United Kingdom
| | - Brenda Penninx
- Department of Psychiatry, EMGO Institute for Health and Care Research and Neuroscience Campus Amsterdam, Vrije Universiteit Medical Center/GGZ inGeest, Amsterdam, The Netherlands
| | - Michael J Econs
- Departments of Medical and Molecular Genetics and
- Medicine, Indiana University, Indianapolis, Indiana
| | - Kathleen A Ryan
- Department of Medicine and Program for Personalized and Genomic Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Claes Ohlsson
- Department of Internal Medicine and Clinical Nutrition, Centre for Bone and Arthritis Research, and
| | - Andrew D Paterson
- Program in Genetics & Genome Biology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Bruce M Psaty
- Institutes for Community Medicine, Department Study of Health in Pomerania - Klinisch-Epidemiologische Forschung (SHIP-KEF), and
- Departments of Health Services and
- Group Health Research Institute, Group Health Cooperative, Seattle, Washington
| | - David S Siscovick
- Department of Epidemiology, University of Washington School of Public Health, Seattle, Washington
- The New York Academy of Medicine, New York, New York
- Medicine, University of Washington, Seattle, Washington
| | - Jerome I Rotter
- Department of Pediatrics and Los Angeles Biomedical Research Institute at Harbor-University of California, Los Angeles, Medical Center, Institute for Translational Genomics and Population Sciences, Torrance, California
| | - Mario Pirastu
- Institute of Population Genetics, National Research Council of Italy, Rome, Italy
| | - Elizabeth Streeten
- Department of Medicine and Program for Personalized and Genomic Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Winfried März
- Vth Department of Medicine, Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany
- Synlab Academy, Synlab Services GmbH, Mannheim, Germany; and
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - Caroline Fox
- Department of Genetics and Pharmacogenomics, Merck Research, Whitehouse Station, New Jersey
| | - Josef Coresh
- Department of Epidemiology, Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | | | | | - Ian H de Boer
- Division of Nephrology, Department of Medicine, Kidney Research Institute
- Department of Epidemiology, University of Washington School of Public Health, Seattle, Washington
| | - Bryan Kestenbaum
- Division of Nephrology, Department of Medicine, Kidney Research Institute
- Department of Epidemiology, University of Washington School of Public Health, Seattle, Washington
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Adler L, Efrati E, Zelikovic I. Molecular mechanisms of epithelial cell-specific expression and regulation of the human anion exchanger (pendrin) gene. Am J Physiol Cell Physiol 2008; 294:C1261-76. [PMID: 18322141 DOI: 10.1152/ajpcell.00486.2007] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pendrin, a Cl(-)/anion exchanger encoded by the gene PDS, is highly expressed in the kidney, thyroid, and inner ear epithelia and is essential for bicarbonate secretion, iodide accumulation, and endolymph ion balance, respectively. This study aimed to define promoter regulatory elements essential for renal, thyroid, and inner ear epithelial cell-specific expression of human PDS (hPDS) and to explore the effect of ambient pH and aldosterone on hPDS promoter activity. Endogenous pendrin mRNA and protein were detected in renal HEK293, thyroid LA2, and inner ear VOT36 epithelial cell lines, but not in the fibroblast cell line, NIH3T3. A 4.2-kb hPDS 5'-flanking DNA sequence and consecutive 5'-deletion products were cloned into luciferase reporter vectors and transiently transfected into the above cell lines. Distinct differences in expression/activity of deduced positive/negative regulatory elements within the hPDS promoter between HEK293, LA2, and VOT36 cells were demonstrated, with only basal activity in NIH3T3 cells. Acidic pH (7.0-7.1) decreased and alkaline pH (7.6-7.7) increased hPDS promoter activity in transfected HEK293 and VOT36, but not in LA2 cells. Aldosterone (10(-8) M) reduced hPDS promoter activity in HEK293 but had no effect in LA2 and VOT36 cells. These pH and aldosterone-induced effects on the hPDS promoter occurred within 96-bp and 89-bp regions, respectively, which likely contain distinct response elements to these modulators. Acidic pH and aldosterone decreased, and alkaline pH increased, endogenous pendrin mRNA level in HEK293 cells. In conclusion, pendrin-mediated HCO3(-) secretion in the renal tubule and anion transport in the endolymph may be regulated transcriptionally by systemic pH and aldosterone.
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Affiliation(s)
- Lior Adler
- Department of Physiology and Biophysics, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
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Rosenberg T, Shachaf C, Tzukerman M, Skorecki K. A murine transgenic model for transcriptional regulation of the Na/Pi-IIa major renal phosphate cotransporter. Am J Physiol Renal Physiol 2007; 292:F1617-25. [PMID: 17287201 DOI: 10.1152/ajprenal.00412.2006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Levels of the type IIa Na/P(i) (Na/Pi-IIa) cotransporter, which serves as the principal mediator of phosphate reabsorption in the kidney, can be modulated through posttranscriptional or posttranslational mechanisms by dietary, hormonal, and pharmacological influences. Previous studies have not demonstrated clear-cut evidence for modulation of Na/Pi-IIa cotransporter levels through transcriptional mechanisms. We have previously demonstrated that a 4.7-kb rat genomic fragment upstream of the rodent Npt2 gene encoding the Na/Pi-IIa cotransporter, is sufficient to mediate its transcriptional activity in vitro (Shachaf C, Skorecki KL, Tzukerman M. Am J Physiol Renal Physiol 278: F406-F416, 2000). Accordingly, we have established an in vivo experimental model in which this Npt2 genomic fragment fused upstream of a Lac Z reporter gene was expressed as a transgene in mice. The nine independent transgenic founder lines generated exhibited Lac Z reporter gene expression specifically in the renal cortex. This renal cortical-specific expression driven by the Npt2 promoter was confirmed at the mRNA and protein levels using RT-PCR, histochemistry, and Lac Z enzymatic activity. Furthermore, the expression of the transgene correlated with expression of the endogenous Npt2 gene during embryonic and early postnatal development. Thus we have generated a transgenic mouse model which will enable in vivo investigation of the contribution of transcriptional mechanisms to the overall regulation of Na/Pi-IIa expression under physiological and pathophysiological conditions.
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Affiliation(s)
- Tzur Rosenberg
- Rambam Medical Center, Technion-Israel Institute of Technology, Haifa, Israel
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Yamamoto H, Tani Y, Kobayashi K, Taketani Y, Sato T, Arai H, Morita K, Miyamoto KI, Pike JW, Kato S, Takeda E. Alternative promoters and renal cell-specific regulation of the mouse type IIa sodium-dependent phosphate cotransporter gene. ACTA ACUST UNITED AC 2005; 1732:43-52. [PMID: 16380173 DOI: 10.1016/j.bbaexp.2005.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Revised: 10/06/2005] [Accepted: 11/08/2005] [Indexed: 10/25/2022]
Abstract
The type IIa sodium-dependent phosphate cotransporter (NPT2a) expressed in renal proximal tubules represents an important determinant in maintaining inorganic phosphate (Pi) homeostasis. In the present study, we identified two variant transcripts of the mouse NPT2a gene, Npt2a-v1 and Npt2a-v2, characterized by the presence of alternative first exons (either exon 1A or exon 1B). The chromosomal structure analysis revealed that the Npt2a gene comprises of two promoters (promoters 1 and 2) and 14 exons, and spans approximately 17 kb. Quantitative PCR analysis showed that renal mRNA levels of both the variants markedly decreased in X-linked vitamin D-resistant hypophosphatemic rickets (Hyp) mice compared to normal littermates. Interestingly, transcriptional activity of a reporter gene, containing Npt2a promoters 1 and 2, was renal cell-specifically increased by 1alpha, 25(OH)2D3 and its analogs. The deletion analysis revealed that the CAAT box in the Npt2a promoter 2 is important for the 1alpha, 25(OH)2D3-dependent renal cell-specific activation of the reporter gene. These data suggested that two alternative promoters control the renal expression of Npt2a gene and both Npt2a variant transcripts are down regulated in Hyp mice.
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Affiliation(s)
- Hironori Yamamoto
- Department of Clinical Nutrition, Institute of Health Biosciences, University of Tokushima Graduate School, Kuramoto-Cho 3-18-15, Tokushima City 770-8503, Japan.
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Efrati E, Arsentiev-Rozenfeld J, Zelikovic I. The human paracellin-1 gene (hPCLN-1): renal epithelial cell-specific expression and regulation. Am J Physiol Renal Physiol 2004; 288:F272-83. [PMID: 15353399 DOI: 10.1152/ajprenal.00021.2004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Tubular reabsorption of Mg2+ is mediated by the tight junction protein paracellin-1, which is encoded by the gene PCLN-1 (CLDN16) and exclusively expressed in the kidney. Tubular Mg2+ reclamation is modulated by many hormones and factors. The aim of this study was to define regulatory elements essential for renal tubular cell-specific expression of human PCLN-1 (hPCLN-1) and to explore the effect of Mg2+ transport modulators on the paracellin-1 gene promoter. Endogenous paracellin-1 mRNA and protein were detected in renal cell lines opossom kidney (OK), HEK293, and MDCT, but not in the fibroblast cell line NIH3T3. A 7.5-kb hPCLN-1 5'-flanking DNA sequence along with seven 5'-deletion products were cloned into luciferase reporter vectors and transiently transfected into the renal and nonrenal cells. The highest levels of luciferase activity resulted from transfection of a 5'-flanking 2.5-kb fragment (pJ2M). This activity was maximal in OK cells, was orientation dependent, and was absent in NIH3T3 cells. Mg2+ deprivation significantly increased pJ2M-driven activity in transfected OK cells, whereas Mg2+ load decreased it compared with conditions of normal Mg2+. Deletion analysis along with electrophoretic mobility-shift assay demonstrated that OK cells contain nuclear proteins, which bind a 70-bp region between -1633 and -1703 of major functional significance. Deleting this 70-bp segment, which contains a single peroxisome proliferator-response element (PPRE), or mutating the PPRE, caused a 60% reduction in luciferase activity. Stimulating the 70-bp sequence with 1,25(OH)2 vitamin D decreased luciferase activity by 52%. This effect of 1,25(OH)2 vitamin D was abolished in the absence of PPRE or in the presence of mutated PPRE. We conclude that the PPRE within this 70-bp DNA region may play a key role in the cell-specific and regulatory activity of the hPCLN-1 promoter. Ambient Mg2+ concentration and 1,25(OH)2 vitamin D may modulate paracellular, paracellin-1-mediated, Mg2+ transport at the transcriptional level. 1,25(OH)2 vitamin D exerts its activity on the hPCLN-1 promoter likely via the PPRE site.
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Affiliation(s)
- Edna Efrati
- Laboratory of Developmental Nephrology, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
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