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Mas-Bermejo P, Azcona-Granada N, Peña E, Lecube A, Ciudin A, Simó R, Luna A, Rigla M, Arenas C, Caixàs A, Rosa A. Genetic risk score based on obesity-related genes and progression in weight loss after bariatric surgery: a 60-month follow-up study. Surg Obes Relat Dis 2024; 20:814-821. [PMID: 38744640 DOI: 10.1016/j.soard.2024.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 04/02/2024] [Accepted: 04/02/2024] [Indexed: 05/16/2024]
Abstract
BACKGROUND Obesity is a polygenic multifactorial disease. Recent genome-wide association studies have identified several common loci associated with obesity-related phenotypes. Bariatric surgery (BS) is the most effective long-term treatment for patients with severe obesity. The huge variability in BS outcomes between patients suggests a moderating effect of several factors, including the genetic architecture of the patients. OBJECTIVE To examine the role of a genetic risk score (GRS) based on 7 polymorphisms in 5 obesity-candidate genes (FTO, MC4R, SIRT1, LEP, and LEPR) on weight loss after BS. SETTING University hospital in Spain. METHODS We evaluated a cohort of 104 patients with severe obesity submitted to BS (Roux-en-Y gastric bypass or sleeve gastrectomy) followed up for >60 months (lost to follow-up, 19.23%). A GRS was calculated for each patient, considering the number of carried risk alleles for the analyzed genes. During the postoperative period, the percentage of excess weight loss total weight loss and changes in body mass index were evaluated. Generalized estimating equation models were used for the prospective analysis of the variation of these variables in relation to the GRS. RESULTS The longitudinal model showed a significant effect of the GRS on the percentage of excess weight loss (P = 1.5 × 10-5), percentage of total weight loss (P = 3.1 × 10-8), and change in body mass index (P = 7.8 × 10-16) over time. Individuals with a low GRS seemed to experience better outcomes at 24 and 60 months after surgery than those with a higher GRS. CONCLUSION The use of the GRS in considering the polygenic nature of obesity seems to be a useful tool to better understand the outcome of patients with obesity after BS.
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Affiliation(s)
- Patricia Mas-Bermejo
- Secció de Zoologia i Antropologia Biòlogica, Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain; Institut de Biomedicina de la Universitat de Barcelona, Barcelona, Spain
| | - Natalia Azcona-Granada
- Secció de Zoologia i Antropologia Biòlogica, Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain; Department of Biological Psychology, Vrije Universiteit, Amsterdam, Netherlands; Amsterdam Public Health Research Institute, Amsterdam University Medical Centre, Amsterdam, Netherlands
| | - Elionora Peña
- Secció de Zoologia i Antropologia Biòlogica, Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain; Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen, Denmark
| | - Albert Lecube
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, Madrid, Spain; Department of Endocrinology and Nutrition, Hospital Universitari Arnau de Vilanova, IRBLleida, Universitat de Lleida, Lleida, Spain
| | - Andreea Ciudin
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, Madrid, Spain; Institut de Recerca Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Rafael Simó
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, Madrid, Spain; Institut de Recerca Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Alexis Luna
- Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA-ISCIII), Sabadell, Spain; Department of Surgery, Esofago-gastric Surgery Section, Hospital Universitari Parc Taulí, Sabadell, Spain
| | - Mercedes Rigla
- Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA-ISCIII), Sabadell, Spain; Department of Endocrinology and Nutrition, Hospital Universitari Parc Taulí, and Department of Medicine, Universitat Autònoma de Barcelona, Sabadell, Spain
| | - Concepción Arenas
- Secció d'Estadística, Department de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
| | - Assumpta Caixàs
- Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA-ISCIII), Sabadell, Spain; Department of Endocrinology and Nutrition, Hospital Universitari Parc Taulí, and Department of Medicine, Universitat Autònoma de Barcelona, Sabadell, Spain.
| | - Araceli Rosa
- Secció de Zoologia i Antropologia Biòlogica, Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain; Institut de Biomedicina de la Universitat de Barcelona, Barcelona, Spain; CIBER de Salud Mental, Instituto de Salud Carlos III, Madrid, Spain.
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Kaur H, Bains V, Sharma T, Badaruddoza. Relationship between leptin gene variants (–2548G>A and 19A>G) and obesity among north Indian Punjabi population. J Genet 2022. [DOI: 10.1007/s12041-022-01401-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Socol CT, Chira A, Martinez-Sanchez MA, Nuñez-Sanchez MA, Maerescu CM, Mierlita D, Rusu AV, Ruiz-Alcaraz AJ, Trif M, Ramos-Molina B. Leptin Signaling in Obesity and Colorectal Cancer. Int J Mol Sci 2022; 23:4713. [PMID: 35563103 PMCID: PMC9102849 DOI: 10.3390/ijms23094713] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 04/19/2022] [Accepted: 04/22/2022] [Indexed: 12/05/2022] Open
Abstract
Obesity and colorectal cancer (CRC) are among the leading diseases causing deaths in the world, showing a complex multifactorial pathology. Obesity is considered a risk factor in CRC development through inflammation, metabolic, and signaling processes. Leptin is one of the most important adipokines related to obesity and an important proinflammatory marker, mainly expressed in adipose tissue, with many genetic variation profiles, many related influencing factors, and various functions that have been ascribed but not yet fully understood and elucidated, the most important ones being related to energy metabolism, as well as endocrine and immune systems. Aberrant signaling and genetic variations of leptin are correlated with obesity and CRC, with the genetic causality showing both inherited and acquired events, in addition to lifestyle and environmental risk factors; these might also be related to specific pathogenic pathways at different time points. Moreover, mutation gain is a crucial factor enabling the genetic process of CRC. Currently, the inconsistent and insufficient data related to leptin's relationship with obesity and CRC indicate the necessity of further related studies. This review summarizes the current knowledge on leptin genetics and its potential relationship with the main pathogenic pathways of obesity and CRC, in an attempt to understand the molecular mechanisms of these associations, in the context of inconsistent and contradictory data. The understanding of these mechanisms linking obesity and CRC could help to develop novel therapeutic targets and prevention strategies, resulting in a better prognosis and management of these diseases.
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Affiliation(s)
| | - Alexandra Chira
- 2nd Medical Clinic, Department of Internal Medicine, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania;
| | - Maria Antonia Martinez-Sanchez
- Obesity and Metabolism Laboratory, Biomedical Research Institute of Murcia (IMIB), 30120 Murcia, Spain; (M.A.M.-S.); (M.A.N.-S.)
| | - Maria Angeles Nuñez-Sanchez
- Obesity and Metabolism Laboratory, Biomedical Research Institute of Murcia (IMIB), 30120 Murcia, Spain; (M.A.M.-S.); (M.A.N.-S.)
| | | | - Daniel Mierlita
- Department of Nutrition, University of Oradea, 410048 Oradea, Romania;
| | - Alexandru Vasile Rusu
- Life Science Institute, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 400372 Cluj-Napoca, Romania;
- Faculty of Animal Science and Biotechnology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 400372 Cluj-Napoca, Romania
| | - Antonio Jose Ruiz-Alcaraz
- Department of Biochemistry and Molecular B and Immunology, Faculty of Medicine, University of Murcia, 30100 Murcia, Spain;
| | - Monica Trif
- Department of Food Research, Centiv GmbH, 28857 Syke, Germany;
| | - Bruno Ramos-Molina
- Obesity and Metabolism Laboratory, Biomedical Research Institute of Murcia (IMIB), 30120 Murcia, Spain; (M.A.M.-S.); (M.A.N.-S.)
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Sabi EM, Bin Dahman LS, Mohammed AK, Sumaily KM, Al-Daghri NM. -2548G>A LEP Polymorphism Is Positively Associated with Increased Leptin and Glucose Levels in Obese Saudi Patients Irrespective of Blood Pressure Status. Medicina (B Aires) 2022; 58:346. [DOI: https:/doi.org/10.3390/medicina58030346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2023] Open
Abstract
Background and Objectives: In this study, we aimed to investigate the link between common -2548G>A (rs7799039) promoter variant of the human leptin gene (LEP) with leptin and serum glucose leptin levels in obese Saudi patients. Materials and Methods: A total of 206 Saudi adults (80 obese normotensive nondiabetics, 76 obese hypertensive with Type 2 Diabetes and 50 normotensive nondiabetic controls) were genotyped for -2548G>A LEP polymorphism using the polymerase chain reaction-restriction fragment-length polymorphism technique. Results: Participants with minor AA genotype had significantly higher blood glucose levels (6.8 ± 0.55 mmol/L vs. 5.8 ± 0.30 mmol/L; p < 0.04) and HOMA-IR (4.1 ± 0.84 vs. 2.6 ± 0.67; p = 0.03) against those carrying major GG genotype. Participants with heterozygous GA genotype had significantly higher serum leptin levels against those carrying major GG genotype (40.0 ± 2.6 ng/mL vs. 29.6 ± 2.6 ng/mL; p = 0.04). Further investigation showed that individuals with AA, GA, GA + AA genotypes are at greater risk of developing hyperglycemia compared to those with GG genotype [OR 3.7(1.6–8.4), p = 0.001; 3.2 (1.2–8.6), p = 0.03; 3.5 (1.6–7.7), p = 0.001, respectively]. Additionally, the -2548AA allele was shown to be a risk factor for hyperglycemia [OR 1.9 (1.2–3.0), p = 0.006]. Our data revealed no relationship between this variant of the LEP gene with systolic and diastolic BP, signifying that this genetic variant is not a significant marker of obesity and hypertension in the Saudi population. Conclusions: AA and GA genotypes and LEP gene -2548AA alleles may signify potent risk factors predisposing healthy individuals to develop T2DM regardless of blood-pressure profile.
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Sabi EM, Bin Dahman LS, Mohammed AK, Sumaily KM, Al-Daghri NM. -2548G>A LEP Polymorphism Is Positively Associated with Increased Leptin and Glucose Levels in Obese Saudi Patients Irrespective of Blood Pressure Status. MEDICINA (KAUNAS, LITHUANIA) 2022; 58:346. [PMID: 35334523 PMCID: PMC8955012 DOI: 10.3390/medicina58030346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/15/2022] [Accepted: 02/22/2022] [Indexed: 11/16/2022]
Abstract
Background and Objectives: In this study, we aimed to investigate the link between common -2548G>A (rs7799039) promoter variant of the human leptin gene (LEP) with leptin and serum glucose leptin levels in obese Saudi patients. Materials and Methods: A total of 206 Saudi adults (80 obese normotensive nondiabetics, 76 obese hypertensive with Type 2 Diabetes and 50 normotensive nondiabetic controls) were genotyped for -2548G>A LEP polymorphism using the polymerase chain reaction-restriction fragment-length polymorphism technique. Results: Participants with minor AA genotype had significantly higher blood glucose levels (6.8 ± 0.55 mmol/L vs. 5.8 ± 0.30 mmol/L; p < 0.04) and HOMA-IR (4.1 ± 0.84 vs. 2.6 ± 0.67; p = 0.03) against those carrying major GG genotype. Participants with heterozygous GA genotype had significantly higher serum leptin levels against those carrying major GG genotype (40.0 ± 2.6 ng/mL vs. 29.6 ± 2.6 ng/mL; p = 0.04). Further investigation showed that individuals with AA, GA, GA + AA genotypes are at greater risk of developing hyperglycemia compared to those with GG genotype [OR 3.7(1.6−8.4), p = 0.001; 3.2 (1.2−8.6), p = 0.03; 3.5 (1.6−7.7), p = 0.001, respectively]. Additionally, the -2548AA allele was shown to be a risk factor for hyperglycemia [OR 1.9 (1.2−3.0), p = 0.006]. Our data revealed no relationship between this variant of the LEP gene with systolic and diastolic BP, signifying that this genetic variant is not a significant marker of obesity and hypertension in the Saudi population. Conclusions: AA and GA genotypes and LEP gene -2548AA alleles may signify potent risk factors predisposing healthy individuals to develop T2DM regardless of blood-pressure profile.
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Affiliation(s)
- Essa M. Sabi
- Clinical Biochemistry Unit, Pathology Department, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia;
| | - Lotfi S. Bin Dahman
- Chair for Biomarkers of Chronic Diseases, Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia; (L.S.B.D.); (A.K.M.); (N.M.A.-D.)
- Department of Medical Biochemistry, College of Medicine and Health Sciences, Hadhramout University, Mukalla 50511, Yemen
| | - Abdul Khader Mohammed
- Chair for Biomarkers of Chronic Diseases, Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia; (L.S.B.D.); (A.K.M.); (N.M.A.-D.)
- Sharjah Institute for Medical Research, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Khalid M. Sumaily
- Clinical Biochemistry Unit, Pathology Department, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia;
| | - Nasser M. Al-Daghri
- Chair for Biomarkers of Chronic Diseases, Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia; (L.S.B.D.); (A.K.M.); (N.M.A.-D.)
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Manju SK, Anilkumar TR, Vysakh G, Leena BK, Lekshminarayan V, Kumar PG, Shenoy TK. A Case-Control Study of the Association of Leptin Gene Polymorphisms with Plasma Leptin Levels and Obesity in the Kerala Population. J Obes 2022; 2022:1040650. [PMID: 36619235 PMCID: PMC9812639 DOI: 10.1155/2022/1040650] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Over the last few years, the importance of leptin in energy metabolism has been extensively studied in both animal models and in humans. Very few results are available on the association between human leptin gene (LEP) variants and obesity traits in India. We designed this study to analyse the polymorphisms in human leptin gene and the association of sequence variants with obesity among the population in Kerala, South India. METHODS In this case-control design of 148 study participants, data were collected on socioeconomic aspects and anthropometric measurements. Plasma glucose, insulin, leptin, and lipid profile were measured. Genotyping was done by automated DNA sequencing. RESULTS The common Single Nucleotide Polymorphism (SNP) of 5'-UTR of LEP - 2548G/A was found to be present in the study population with "A" variant as dominant allele. A novel synonymous mutation Thr5Thr of exon 2 of LEP was identified in heterozygous form in one subject with morbid obesity with hyperleptinemia. A novel missense mutation Phe17Leu was observed in two subjects with obesity in heterozygous condition. A novel missense mutation Lys36Arg in exon 2 of LEP was observed in one subject with abdominal obesity and decreased serum leptin level. CONCLUSION LEP - 2548G/A at 5'-untranslated region was found to be common with the mutant "A" variant in the study population. SNPs of exons in LEP were found to be rare but associated with morbid obesity and altered levels of serum leptin in the study population in Kerala, India.
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Affiliation(s)
- Sudharmadevi K. Manju
- Department of Biochemistry, Sree Gokulam Medical College and Research Foundation, Thiruvananthapuram 695607, Kerala, India
| | - Thottathil R. Anilkumar
- Division of Molecular Reproduction, Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695014, Kerala, India
| | - G. Vysakh
- Division of Molecular Reproduction, Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695014, Kerala, India
| | - Balakumaran K. Leena
- Population Health and Research Institute, Medical College P.O., Thiruvananthapuram 695011, Kerala, India
| | | | - Pradeep G. Kumar
- Division of Molecular Reproduction, Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695014, Kerala, India
| | - Trivikrama K. Shenoy
- Department of Gastroenterology, Sree Gokulam Medical College and Research Foundation, Thiruvananthapuram 695607, Kerala, India
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Aljanabi MA, Alfaqih MA, Khanfar M, Amarin ZO, Elsalem L, Saadeh R, Al-Mughales F. Leptin and the GA genotype of rs2167270 of the LEP gene increase the risk of prediabetes. Biomed Rep 2021; 14:44. [PMID: 33786173 DOI: 10.3892/br.2021.1420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 02/02/2021] [Indexed: 11/06/2022] Open
Abstract
Prediabetes is a precursor stage that frequently develops to definitive type 2 diabetes mellitus (T2DM). Therefore, identifying individuals with prediabetes can allow for early intervention measures that delay or prevent disease progression to T2DM. Several biochemical changes appear to be associated with prediabetes, including an increase in the serum levels of leptin. In Jordan, this association has not been previously investigated. In the present study, the serum levels of leptin were measured in 122 prediabetes subjects and 122 controls. Furthermore, the genotypes of three single nucleotide polymorphisms in the LEP gene (rs7799039, rs2167270 and rs791620) were investigated for their association with prediabetes using PCR-restriction fragment length polymorphism. The results revealed a significant increase in serum leptin levels in the prediabetes group. It was also shown that the GA genotype and the A allele of rs2167270 were significantly associated with an increased risk of prediabetes (P<0.05). These findings were shown to be independent of body mass index, waist circumference and serum glucose levels. To the best of our knowledge, the present study is the first in Jordan to have reported an association between serum leptin levels and the GA genotype of rs2167270 with an increased risk of prediabetes, identified both in the univariate and multivariate models.
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Affiliation(s)
- Mukhallad A Aljanabi
- Department of Physiology and Biochemistry, School of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mahmoud A Alfaqih
- Department of Physiology and Biochemistry, School of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mariam Khanfar
- Department of Physiology and Biochemistry, School of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Zouhair O Amarin
- Department of Obstetrics and Gynecology, School of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Lina Elsalem
- Department of Pharmacology, School of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Rami Saadeh
- Department of Community Medicine and Public Health, School of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Faheem Al-Mughales
- Department of Physiology and Biochemistry, School of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
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Garavito P, Mosquera-Heredia MI, Fang L, Payares F, Ruiz M, Arias I, Tuesca R, Navarro É, Silvera-Redondo C. Polymorphisms of leptin-melanocortin system genes associated with obesity in an adult population from Barranquilla. BIOMEDICA : REVISTA DEL INSTITUTO NACIONAL DE SALUD 2020; 40:257-269. [PMID: 32673455 PMCID: PMC7505507 DOI: 10.7705/biomedica.4827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 08/21/2019] [Indexed: 11/11/2022]
Abstract
Introduction: Obesity is considered a serious public health problem. Efforts have been directed to search for candidate genes such as LEP, LEPR, and MC4R involved in the leptin-melanocortin system. The neuroendocrine regulation of these genes on energy intake and balance influences the pathogenesis of this disease. Contradictory results regarding the association of these genes with obesity raise the need for new research. Objective: To analyze the association between obesity and LEP rs2167270, LEPR rs1137101, and MC4R rs17782313 polymorphisms and the clinical and biochemical variables in obese adults from Barranquilla, Colombia. Materials and methods: We analyzed 111 obese adults and 155 non-obese individuals as controls. The polymorphisms were determined by real-time PCR. Besides, anthropometric measures, blood pressure, and biochemical tests were evaluated. Results: No statistical differences were found in allele and genotype frequencies of gene polymorphisms between groups. The CC genotype of MC4R rs17782313 polymorphism was associated with increased systolic blood pressure and T allele and TT genotype, with decreased HDL cholesterol in obese adults. The effect of the other polymorphisms on these variables was not evidenced. Conclusions: LEP rs2167270, LEPR rs1137101, and MC4R rs17782313 polymorphisms were not associated with obesity in the population under study. MC4R rs17782313 polymorphisms were associated with an increase in systolic blood pressure and a decrease in HDL cholesterol.
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Affiliation(s)
- Pilar Garavito
- Grupo de Investigación Genética y Medicina Molecular, Departamento de Medicina, Universidad del Norte, Barranquilla, Colombia.
| | - María Isabel Mosquera-Heredia
- Grupo de Investigación Genética y Medicina Molecular, Departamento de Medicina, Universidad del Norte, Barranquilla, Colombia.
| | - Luis Fang
- Grupo de Investigación Genética y Medicina Molecular, Departamento de Medicina, Universidad del Norte, Barranquilla, Colombia.
| | - Fausto Payares
- Grupo de Investigación Genética y Medicina Molecular, Departamento de Medicina, Universidad del Norte, Barranquilla, Colombia.
| | - Martha Ruiz
- Grupo de Investigación Genética y Medicina Molecular, Departamento de Medicina, Universidad del Norte, Barranquilla, Colombia.
| | - Isis Arias
- Grupo de Investigación Genética y Medicina Molecular, Departamento de Medicina, Universidad del Norte, Barranquilla, Colombia.
| | - Rafael Tuesca
- Grupo de Investigación Proyecto UNI, Departamento de Salud Pública, Universidad del Norte, Barranquilla, Colombia.
| | - Édgar Navarro
- Grupo de Investigación Proyecto UNI, Departamento de Salud Pública, Universidad del Norte, Barranquilla, Colombia.
| | - Carlos Silvera-Redondo
- Grupo de Investigación Genética y Medicina Molecular, Departamento de Medicina, Universidad del Norte, Barranquilla, Colombia.
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Methylation of the LEP gene promoter in blood at 12 months and BMI at 4 years of age-a population-based cohort study. Int J Obes (Lond) 2020; 44:842-847. [PMID: 32107462 DOI: 10.1038/s41366-020-0553-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 02/06/2020] [Accepted: 02/12/2020] [Indexed: 12/19/2022]
Abstract
Increasing evidence links epigenetic variation to anthropometric and metabolic measures. Leptin signalling regulates appetite and energy expenditure, and in pregnancy is important for nutrient supply to the foetus. Maternal metabolic health and foetal growth are linked to infant blood leptin gene (LEP) methylation, which has been cross-sectionally associated with adolescent obesity. Despite this, few studies have explored the relationship between infant LEP methylation and childhood anthropometry, or the impact of genetic variation on these relationships. Using a prospective birth cohort, we investigated whether blood LEP promoter methylation at birth and 12 months predicts weight and adiposity at 4-years. Locus-specific methylation data was analysed by partial correlation tests and multivariable linear regression. There was weak evidence of an association of birth LEP methylation with anthropometry measures at 4 years. Methylation at a specific site (cg19594666) at 12 months was inversely associated with 4-year weight (r = -0.11, p = 0.02) and body-mass index (BMI) (r = -0.13, p = 0.007), which persisted following adjustment for weight at birth and at 12 months. Neither association was influenced by genotype. We report the first evidence of an association between LEP methylation in infancy and childhood weight. Replication in additional cohorts is required to determine if this relationship persists.
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Duan DM, Jhang JY, Wu S, Teng MS, Hsu LA, Ko YL. Modification effect of sex and obesity on the correlation of LEP polymorphisms with leptin levels in Taiwanese obese women. Mol Genet Genomic Med 2020; 8:e1113. [PMID: 31914480 PMCID: PMC7057123 DOI: 10.1002/mgg3.1113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 11/19/2019] [Accepted: 11/26/2019] [Indexed: 01/05/2023] Open
Abstract
Background Obesity has become the main health issue in developed countries as it impacts life expectancy and increases mortality of cerebrovascular or cardiovascular diseases. The leptin is one of the adipokines which presents in the serum in proportion to the amount of adipose tissue and is translated from LEP gene. It involves in energy homeostasis, lipid and glucose metabolisms, modulation of immune systems, and thermogenesis. Many previous studies have revealed controversial results between LEP polymorphisms and leptin levels in different ages and ethnicities. Herein, we investigated the impacts of LEP polymorphism against leptin levels in Taiwanese subjects. Methods In 599 Taiwanese subjects, excluding clinically overt systemic disease, age below 18 years old, and C‐reactive protein (CRP) level of above 10 mg/L, few of LEP polymorphisms were genotyped with TaqMan SNP genotyping assays, were further analyzed for association with leptin level in univariate and multivariate linear regression analyses with Bonferroni correction for multiple tests in stratified groups. The univariate and stepwise multivariate linear regression analyses were performed to determine the coefficient of determinant of LEP polymorphisms over leptin level. Results Significant associations were found between LEP polymorphisms and leptin levels in obese women. Circulating leptin level was positively correlated with inflammatory, insulin resistance markers, and visceral obesity markers in all subjects. Furthermore, stratified and interaction analyses revealed that LEP polymorphisms, rs7799039 and rs2167270, were significantly associated with leptin levels in obese women—8%–10% of which could be explained by LEP polymorphisms. Conclusion The LEP polymorphisms are independently associated with leptin levels in Taiwanese obese women. Further, the genetic determinants for leptin levels may be different between obese and nonobese, and in different sex individuals. The obesity status and female sex may exert modification effect on transcription of LEP, particularly in obese women.
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Affiliation(s)
- De-Min Duan
- Division of Cardiology, Department of Internal Medicine and The Cardiovascular Medical Center, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan
| | - Jing-Yi Jhang
- Division of Cardiology, Department of Internal Medicine and The Cardiovascular Medical Center, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan
| | - Semon Wu
- Department of Life Science, Chinese Culture University, Taipei, Taiwan
| | - Ming-Sheng Teng
- Department of Research, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan
| | - Lung-An Hsu
- The First Cardiovascular Division, Department of Internal Medicine, Chang Gung Memorial Hospital, Taipei, Taiwan.,Chang Gung University College of Medicine, Taipei, Taiwan
| | - Yu-Lin Ko
- Division of Cardiology, Department of Internal Medicine and The Cardiovascular Medical Center, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan.,Department of Research, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan.,Tzu Chi University College of Medicine, Hualien, Taiwan
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Leptin rs7799039 polymorphism is associated with multiple sclerosis risk in Kuwait. Mult Scler Relat Disord 2019; 36:101409. [DOI: 10.1016/j.msard.2019.101409] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Revised: 08/28/2019] [Accepted: 09/23/2019] [Indexed: 12/14/2022]
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Genetic variation, intrauterine growth, and adverse pregnancy conditions predict leptin gene DNA methylation in blood at birth and 12 months of age. Int J Obes (Lond) 2019; 44:45-56. [PMID: 31636377 DOI: 10.1038/s41366-019-0472-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 09/19/2019] [Accepted: 09/30/2019] [Indexed: 01/08/2023]
Abstract
BACKGROUND Leptin regulates satiety and energy homoeostasis, and plays a key role in placentation in pregnancy. Previous studies have demonstrated regulation of leptin gene (LEP) expression and/or methylation in placenta and cord blood in association with early life exposures, but most have been small and have not considered the influence of genetic variation. Here, we investigated the relationship between maternal factors in pregnancy, infant anthropometry and LEP genetic variation with LEP promoter methylation at birth and 12 months of age. METHODS LEP methylation was measured in cord (n = 877) and 12-month (n = 734) blood in the Barwon Infant Study, a population-based pre-birth cohort. Infant adiposity at birth and 12-months was measured as triceps and subscapular skinfold thickness. Cross-sectional regression tested associations of methylation with pregnancy and anthropometry measures, while longitudinal regression tested if birth anthropometry predicted 12-month LEP methylation levels. RESULTS Male infants had lower LEP methylation in cord blood (-2.07% average methylation, 95% CI (-2.92, -1.22), p < 0.001). Genetic variation strongly influenced DNA methylation at a single CpG site, which was also negatively associated with birth weight (r = -0.10, p = 0.003). Pre-eclampsia was associated with lower cord blood methylation at another CpG site (-6.06%, 95% CI (-10.70, -1.42), p = 0.01). Gestational diabetes was more modestly associated with methylation at two other CpG units. Adiposity at birth was associated with 12-month LEP methylation, modified by rs41457646 genotype. There was no association of LEP methylation with 12-month anthropometric measures. CONCLUSIONS Infant sex, weight, genetic variation, and exposure to pre-eclampsia and gestational diabetes, are associated with LEP methylation in cord blood. Infant adiposity at birth predicts 12-month blood LEP methylation in a genotype-dependent manner. These findings are consistent with genetics and anthropometry driving altered LEP epigenetic profile and expression in infancy. Further work is required to confirm this and to determine the long-term impact of altered LEP methylation on health.
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Circulating leptin concentration, LEP gene variants and haplotypes, and polycystic ovary syndrome in Bahraini and Tunisian Arab women. Gene 2019; 694:19-25. [DOI: 10.1016/j.gene.2019.01.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 12/27/2018] [Accepted: 01/22/2019] [Indexed: 02/07/2023]
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Dar R, Rasool S, Waza AA, Ayoub G, Qureshi M, Zargar AH, Bashir I, Jan T, Andrabi KI. Polymorphic Analysis of Leptin Promoter in Obese/diabetic Subjects in Kashmiri Population. Indian J Endocrinol Metab 2019; 23:111-116. [PMID: 31016164 PMCID: PMC6446689 DOI: 10.4103/ijem.ijem_164_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The role of common variants in leptin promoter has already been established to play a major role in obesity and diabetes in humans. The study was accordingly focused on leptin promoter variants and their potential association with diabetes and obesity in ethnic population from Kashmir, India. METHODS Allele frequencies of 620 Kashmiri subjects with diabetes (200), obese subjects (200), and ethnically matched healthy controls (200) were tested for the Hardy-Weinberg disequilibrium. Among 200 obese subjects, a total of 50 persons were with diabetes. The genotype and allele frequencies were evaluated using the Chi-square or Fisher's exact tests. RESULTS Sequence analysis revealed two reported variations i.e., rs72563764C>T and rs7799039G>A in promoter region. Both variants show homozygous as well as heterozygous genotypes. These variations indicated significant difference with respect to allelic and genotypic frequencies in all groups i.e., persons with diabetes, obese, and obese persons with diabetes (P < 0.05). We also analyzed the association of these variations with biochemical characteristics and found significant association of rs72563764C>T with triglycerides (TG) in obese patients and fasting plasma glucose (FPG) and random blood sugar (RBS) in obese/persons with diabetes. Also rs7799039G>A showed association with postprandial plasma sugar (PPPS) in obese patients and FPG and resting plasma glucose (RPG) in obese persons with diabetes. CONCLUSIONS Our results are suggestive of the association of leptin promoter gene variations i.e., rs72563764C>T and rs7799039G>A with both diabetes and obesity.
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Affiliation(s)
- Rubiya Dar
- Department of Biotechnology, University of Kashmir, Hazratbal Srinagar, Srinagar, Jammu and Kashmir, India
| | - Shabhat Rasool
- Department of Biotechnology, University of Kashmir, Hazratbal Srinagar, Srinagar, Jammu and Kashmir, India
| | - Ajaz Ahmad Waza
- Centre of Research for Development (CORD), University of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Gazalla Ayoub
- Department of Biotechnology, University of Kashmir, Hazratbal Srinagar, Srinagar, Jammu and Kashmir, India
| | - Meenu Qureshi
- Department of Biotechnology, University of Kashmir, Hazratbal Srinagar, Srinagar, Jammu and Kashmir, India
| | - Abdul Hamid Zargar
- Department of Endocrinology, Sher-i-Kashmir Institute of Medical Sciences (SKIMS), Soura, Srinagar, Jammu and Kashmir, India
| | - Iftikhar Bashir
- Department of Endocrinology, Sher-i-Kashmir Institute of Medical Sciences (SKIMS), Soura, Srinagar, Jammu and Kashmir, India
| | - Tariq Jan
- Department of Statistics, University of Kashmir, Hazratbal Srinagar, Srinagar, Jammu and Kashmir, India
| | - Khurshid Iqbal Andrabi
- Department of Biotechnology, University of Kashmir, Hazratbal Srinagar, Srinagar, Jammu and Kashmir, India
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Ulloa-Martínez M, Burguete-García AI, Murugesan S, Hoyo-Vadillo C, Cruz-Lopez M, García-Mena J. Expression of candidate genes associated with obesity in peripheral white blood cells of Mexican children. Arch Med Sci 2016; 12:968-976. [PMID: 27695486 PMCID: PMC5016575 DOI: 10.5114/aoms.2016.58126] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 02/04/2015] [Indexed: 01/16/2023] Open
Abstract
INTRODUCTION Obesity is a chronic, complex, and multifactorial disease, characterized by excess body fat. Diverse studies of the human genome have led to the identification of susceptibility genes that contribute to obesity. However, relatively few studies have addressed specifically the association between the level of expression of these genes and obesity. MATERIAL AND METHODS We studied 160 healthy and obese unrelated Mexican children aged 6 to 14 years. We measured the transcriptional expression of 20 genes associated with obesity, in addition to the biochemical parameters, in peripheral white blood cells. The detection of mRNA levels was performed using the OpenArray Real-Time PCR System (Applied Biosystems). RESULTS Obese children exhibited higher values of fasting glucose (p = 0.034), fasting insulin (p = 0.004), low-density lipoprotein (p = 0.006), triglycerides (p < 0.001), systolic blood pressure and diastolic blood pressure (p < 0.001), and lower values of high-density lipoprotein (p < 0.001) compared to lean children. Analysis of transcriptional expression data showed a difference for ADRB1 (p = 0.0297), ADIPOR1 (p = 0.0317), GHRL (p = 0.0060) and FTO (p = 0.0348) genes. CONCLUSIONS Our results suggest that changes in the expression level of the studied genes are involved in biological processes implicated in the development of childhood obesity. Our study contributes new perspectives for a better understanding of biological processes involved in obesity. The protocol was approved by the National Committee and Ethical Committee Board from the Mexican Social Security Institute (IMSS) (IMSS FIS/IMSS/PRIO/10/011).
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Affiliation(s)
- Marcela Ulloa-Martínez
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del IPN, México, México
| | - Ana I. Burguete-García
- Dirección de Infecciones Crónicas y Cáncer, CISEI, Instituto Nacional de Salud Pública, México, México
| | - Selvasankar Murugesan
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del IPN, México, México
- Departamento de Farmacología, Centro de Investigación y de Estudios Avanzados del IPN, México, México
| | - Carlos Hoyo-Vadillo
- Departamento de Farmacología, Centro de Investigación y de Estudios Avanzados del IPN, México, México
| | - Miguel Cruz-Lopez
- Unidad Unidad de Investigación Médica en Bioquímica, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México, México
| | - Jaime García-Mena
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del IPN, México, México
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de Faria AP, Ritter AMV, Sabbatini AR, Modolo R, Moreno H. Effects of leptin and leptin receptor SNPs on clinical- and metabolic-related traits in apparent treatment-resistant hypertension. Blood Press 2016; 26:74-80. [PMID: 27310420 DOI: 10.1080/08037051.2016.1192945] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Leptin is associated to the lack of blood pressure control as well as target organ damage in resistant hypertensive (RH) subjects. Single-nucleotide polymorphisms (SNPs) rs7799039 and rs1137101 in leptin (LEP) and leptin receptor (LEPR) genes, respectively, are associated with cardiovascular disease and metabolic syndrome. We evaluated the association of these two SNPs with clinical and biochemical features in 109 apparent treatment-RH subjects (aTRH) and 125 controlled hypertensives. Homozygous genotypes GG (n = 43) vs. AA (n = 14) for rs7799039 and AA (n = 34) vs. GG (n = 26) genotypes for rs1137101 were compared in aTRH subjects. There was no difference in leptin levels among both SNPs. On the other hand, LEP SNP (GG vs. AA) associated with the levels of glycated haemoglobin (6.4 ± 1.4 vs. 7.8 ± 2.3%, p = 0.03), insulin (8.6 ± 4.6 vs. 30.6 ± 27.7 uUI/mL, p = 0.01), HDL-cholesterol (51 ± 16 vs. 39 ± 11 mg/dL, p = 0.001) and PWV (9.5 ± 2.1 vs. 11.2 ± 2.8 m/s, p = 0.03). LEPR SNP (AA vs. GG), associated with heart rate (69 ± 12 vs. 67 ± 12 bpm, p = 0.03), fat mass (31 ± 11 vs. 24 ± 8 kg, p = 0.03) and triglycerides levels (175 ± 69 vs. 135 ± 75 mg/dL, p = 0.03). These findings may be clinically useful for identifying a group of aTRH who may have a LEP and/or LEPR gene variants, which may predispose this specific group to worse or better outcomes.
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Affiliation(s)
- Ana Paula de Faria
- a Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences, University of Campinas , Campinas , SP , Brazil
| | - Alessandra M V Ritter
- a Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences, University of Campinas , Campinas , SP , Brazil
| | - Andréa R Sabbatini
- a Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences, University of Campinas , Campinas , SP , Brazil
| | - Rodrigo Modolo
- a Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences, University of Campinas , Campinas , SP , Brazil
| | - Heitor Moreno
- a Laboratory of Cardiovascular Pharmacology, Faculty of Medical Sciences, University of Campinas , Campinas , SP , Brazil
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In Search of Biomarkers for Idiopathic Scoliosis: Leptin and BMP4 Functional Polymorphisms. J Biomark 2015; 2015:425310. [PMID: 26317037 PMCID: PMC4537721 DOI: 10.1155/2015/425310] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2015] [Revised: 07/10/2015] [Accepted: 07/12/2015] [Indexed: 02/04/2023] Open
Abstract
Idiopathic scoliosis (IS) is the most common spinal disorder in children and adolescents. The current consensus on IS maintains that it has a multifactorial etiology with genetic predisposition factors. In the present study the association of two functional polymorphisms of leptin (rs7799039) and BMP4 (rs4898820) with susceptibility to IS and curve severity was investigated in a Bulgarian population sample. The molecular detection of the genotypes was performed by amplification followed by restriction technology. The statistical analysis was performed by Pearson's chi-squared test. This case-control study revealed no statistically significant association between the functional polymorphisms of leptin and BMP4 and susceptibility to IS or curve progression (p > 0.05). On the basis of these results the examined polymorphic variants of leptin and BMP4 could not be considered as genetic variants with predisposition effect or as risk factors for the progression of the curve. In addition, these results do not exclude a synergistic effect of the promoter polymorphisms of leptin and BMP4 in the etiology and pathogenesis of IS. The identification of molecular markers for IS could be useful for early detection and prognosis of the risk for a rapid progression of the curve. That would permit early stage treatment of the patient with the least invasive procedures.
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Polimorfismos de los genes LEP, LDLR, APOA4, sus relaciones con sobrepeso, obesidad y riesgo de enfermedades crónicas en adultos del estado Sucre, Venezuela. BIOMEDICA 2015; 36:78-90. [DOI: 10.7705/biomedica.v36i1.2702] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 05/12/2015] [Indexed: 01/05/2023]
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Role of leptin G-2548A polymorphism in age- and gender-specific development of obesity. J Biosci 2015; 40:521-30. [DOI: 10.1007/s12038-015-9536-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Dasgupta S, Salman M, Siddalingaiah LB, Lakshmi GL, Xaviour D, Sreenath J. Genetic variants in leptin: Determinants of obesity and leptin levels in South Indian population. Adipocyte 2015; 4:135-40. [PMID: 26167411 DOI: 10.4161/21623945.2014.975538] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 06/24/2014] [Accepted: 10/07/2014] [Indexed: 01/13/2023] Open
Abstract
The revelation of leptin action mechanisms has led to various attempts to establish the association of polymorphisms in the leptin gene with obesity-related phenotypes. But, outcomes have been contradicting, which made the information on the role of the leptin gene in regulating the mechanism of pathophysiology of obesity inexplicable. Moreover, none of the studies are known to have similar implications on the Indian population. To address such contradictions, our study aims to evaluate the association of leptin gene polymorphism with obesity and leptin levels in a South Indian Population. A total of 304 cases (BMI≥27.5) and 309 controls (BMI≤23) from local inhabitants of Mysore, Karnataka were recruited for the study. The leptin gene variants rs7799039, rs2167270 and rs4731426 independently, as well as in 4 haplotype combinations, were found to be significantly associated with the risk of obesity. An increasing trend in BMI and leptin levels was observed with every addition of A and C minor alleles of exonic variant (rs2167270) and intronic variant (rs4731426) respectively. However, only AA genotype of SNP rs7799039 was positively associated with BMI. None of the SNPs were associated with fat percentage and waist to hip ratio. On a whole, this data suggests that the common polymorphisms in the leptin gene are strong predictors of obesity and leptin levels in South Indians.
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Marcello MA, Calixto AR, de Almeida JFM, Martins MB, Cunha LL, Cavalari CAA, Etchebehere ECS, da Assumpção LVM, Geloneze B, Carvalho AL, Ward LS. Polymorphism in LEP and LEPR May Modify Leptin Levels and Represent Risk Factors for Thyroid Cancer. Int J Endocrinol 2015; 2015:173218. [PMID: 25810718 PMCID: PMC4355553 DOI: 10.1155/2015/173218] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 02/13/2015] [Indexed: 12/19/2022] Open
Abstract
Purpose. To understand the role of polymorphisms in the LEP (rs7799039 and rs2167270) and LEPR (rs1137101 and rs1137100) genes in DTC susceptibility and their effect on leptin levels. Methods. We studied 153 patients with DTC and 234 controls through TaqMan SNP Genotyping and ELISA, comparing these data to the clinicopathological data of patients with DTC. Results. Patients with AA genotype of rs7799039 had higher levels of serum leptin (9.22 ± 0.98 ng/mL) than those with AG genotype (10.07 ± 0.60 ng/mL; P = 0.005). Individuals with AG genotype of rs2167270 also produced higher serum leptin levels (10.05 ± 0.59 ng/mL) than the subjects with GG genotype (9.52 ± 0.79 ng/mL; P < 0.05). A multivariate logistic regression adjusted for gender, age, and BMI showed that the AG genotype of rs7799039 was an independent risk for DTC (OR, 11.689; P = 0.0183; 95% CI, 1.516-90.119). Similarly, AG and GG genotypes of rs1137101 increased the susceptibility to DTC (OR, 3.747; P = 0.027; 95% CI, 1.161-12.092 and OR, 5.437; P = 0.013; 95% CI, 1.426-20.729). Conclusions. We demonstrated that rs7799039 and rs2167270 polymorphisms modify the serum leptin concentrations in patients with DTC. Furthermore, polymorphisms rs7799039 and rs1137101 increase the risk of DTC development, although they do not correlate with tumor aggressiveness.
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Affiliation(s)
- Marjory Alana Marcello
- Laboratory of Cancer Molecular Genetics (Gemoca), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Tessalia Vieira de Camargo 126, 13083-970 Campinas, SP, Brazil
- *Marjory Alana Marcello:
| | - Antonio Ramos Calixto
- Laboratory of Investigation on Metabolism and Diabetes (LIMED), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Carlos Chagas 420, 13083-878 Campinas, SP, Brazil
| | - Jacqueline Fatima Martins de Almeida
- Laboratory of Cancer Molecular Genetics (Gemoca), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Tessalia Vieira de Camargo 126, 13083-970 Campinas, SP, Brazil
| | - Mariana Bonjiorno Martins
- Laboratory of Cancer Molecular Genetics (Gemoca), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Tessalia Vieira de Camargo 126, 13083-970 Campinas, SP, Brazil
| | - Lucas Leite Cunha
- Laboratory of Cancer Molecular Genetics (Gemoca), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Tessalia Vieira de Camargo 126, 13083-970 Campinas, SP, Brazil
| | - Camila Ayume Amano Cavalari
- Laboratory of Cancer Molecular Genetics (Gemoca), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Tessalia Vieira de Camargo 126, 13083-970 Campinas, SP, Brazil
| | - Elba C. S. Etchebehere
- Service of Nuclear Medicine, University of Campinas, Rua Vital Brasil 251, 13083-888 Campinas, SP, Brazil
| | | | - Bruno Geloneze
- Laboratory of Investigation on Metabolism and Diabetes (LIMED), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Carlos Chagas 420, 13083-878 Campinas, SP, Brazil
| | - Andre Lopes Carvalho
- Department of Head and Neck Surgery, Barretos Cancer Hospital, Rua Antenor Duarte Vilela 1331, 14784-400 Barretos, SP, Brazil
| | - Laura Sterian Ward
- Laboratory of Cancer Molecular Genetics (Gemoca), Faculty of Medical Sciences, University of Campinas (FCM-Unicamp), Rua Tessalia Vieira de Camargo 126, 13083-970 Campinas, SP, Brazil
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Zhang L, Yuan LH, Xiao Y, Lu MY, Zhang LJ, Wang Y. Association of leptin gene -2548 G/A polymorphism with obesity: a meta-analysis. ANNALS OF NUTRITION AND METABOLISM 2014; 64:127-36. [PMID: 25034151 DOI: 10.1159/000363392] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 04/30/2014] [Indexed: 11/19/2022]
Abstract
BACKGROUND A common single-nucleotide polymorphism identified in the 5'-untranslated region of the leptin gene (LEP -2548 G/A polymorphism) may be associated with obesity, but the existing research findings are inconsistent, so we conducted this meta-analysis. METHODS Medline, Embase and ISI Web of Science databases were searched to identify relevant studies. Meta-analysis of the total and subgroup populations was conducted using allelic, additive, dominant and recessive models, and odds ratios and their 95% confidence intervals were calculated in a fixed-effect model if no heterogeneity (evaluated as I(2) statistic) existed. Otherwise, a random-effects model was adopted. Subgroup analysis was performed by ethnicity. Meta-regression and the HETRED analysis were used to explore the potential sources of between-study heterogeneity. Egger's test and influence analysis were conducted to evaluate the publication bias and study power, respectively. RESULTS The final selection enrolled 9 studies, including 2,988 subjects (1,372 obese subjects and 1,616 controls). No significant association was identified between the LEP -2548 G/A polymorphism and obesity for all genetic models in the overall population and Caucasians. We found a significant association with allelic, additive and dominant models for subjects of mixed race from South America. Notwithstanding, this significance should be treated cautiously for it is based on a rather small sample (788 involved subjects). CONCLUSIONS In total, the combined analysis of data from current and published studies suggested that the LEP -2548 G/A polymorphism does not contribute to the development of obesity, despite the fact that a significant association exists in a small subgroup from South America. Further studies are needed to elucidate the relationship. .
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Affiliation(s)
- Ling Zhang
- Department of Nutrition and Food Hygiene, Zhejiang Academy of Medical Sciences, Hangzhou, PR China
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Fan SH, Say YH. Leptin and leptin receptor gene polymorphisms and their association with plasma leptin levels and obesity in a multi-ethnic Malaysian suburban population. J Physiol Anthropol 2014; 33:15. [PMID: 24947733 PMCID: PMC4073586 DOI: 10.1186/1880-6805-33-15] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 06/04/2014] [Indexed: 02/06/2023] Open
Abstract
Background This study was to investigate the prevalence of single nucleotide polymorphisms (SNPs) in leptin gene LEP (A19G and G2548A) and leptin receptor gene LEPR (K109R and Q223R) and their association with fasting plasma leptin level (PLL) and obesity in a Malaysian suburban population in Kampar, Perak. Methods Convenience sampling was performed with informed consents, and the study sample was drawn from patients who were patrons of the Kampar Health Clinic. A total of 408 subjects (mean age, 52.4 ± 13.7 years; 169 men, 239 women; 190 obese, 218 non-obese; 148 Malays, 177 ethnic Chinese, 83 ethnic Indians) participated. Socio-demographic data and anthropometric measurements were taken, and genotyping was performed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Results The LEP A19G, G2548A and LEPR K109R, Q223R variant allele frequencies were 0.74, 0.67 and 0.61, 0.79, respectively. The genotype and allele distributions of these gene variants were significantly different among ethnic groups, but not among body mass index (BMI) classes. Subjects with LEPR K109 and Q223 allele had significantly higher systolic blood pressure and adiposity indices after adjustment for ethnicity (higher BMI, total body and subcutaneous fat; lower skeletal muscle percentage). Subjects with LEPR 109R allele had lower PLL than their wild-type allele counterparts. The influence of LEP A19G and G2548A SNPs on blood pressures, anthropometrics, and PLL was not evident. Interestingly, synergistic effect of the LEP and LEPR SNPs was observed as subjects homozygous for all four SNPs studied exhibited significantly higher subcutaneous fat and PLL than those with other genotype combinations. Conclusions The LEP and LEPR SNPs in this study may not be an obesity marker among Malaysians in this population, but were associated with ethnicity. Our findings suggest that each of these SNPs contributes to minor but significant variation in obesity-related traits and in combination they display synergistic effects on subcutaneous fat and PLL.
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Affiliation(s)
| | - Yee-How Say
- Department of Biomedical Science, Faculty of Science, Universiti Tunku Abdul Rahman (UTAR) Perak Campus, Kampar, Malaysia.
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Oliveira RD, Cerda A, Genvigir FDV, Sampaio MF, Armaganijan D, Bernik MMS, Dorea EL, Hirata MH, Hinuy HM, Hirata RDC. Leptin receptor gene polymorphisms are associated with adiposity and metabolic alterations in Brazilian individuals. ACTA ACUST UNITED AC 2014; 57:677-84. [PMID: 24402012 DOI: 10.1590/s0004-27302013000900002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 08/07/2013] [Indexed: 12/31/2022]
Abstract
OBJECTIVE The aim of the study was to investigate whether adiposity and metabolic markers, such as leptin, glucose, and lipids, are influenced by leptin (LEP) and leptin receptor (LEPR) gene polymorphisms in a sample of our population. SUBJECTS AND METHODS A group of 326 individuals of Caucasian-European descent, aged 30 to 80 years, 87 men and 239 women, 148 obese and 178 non-obese, was randomly selected at two clinical hospitals in the city of Sao Paulo, Brazil. All individuals declared their ethnic group as white during the initial interview. Anthropometric measurements, body mass index (BMI), and fat mass were evaluated. Blood samples were drawn for DNA extraction and measurements of leptin, soluble leptin receptor, glucose, and lipids. LEP -2548G>A and LEPR Lys109Arg (c.326A>G), Gln233Arg (c.668A>G) and Lys656Asn (c.1968G>C) polymorphisms were detected by PCR-RFLP. RESULTS Increased leptin and serum lipids, and LEPR Arg223Arg (GG genotype) were associated with higher risk for obesity (p < 0.05), while reduced risk was found in LEPR Arg109Arg (GG genotype) carriers (OR: 0.38, 95%CI: 0.19-0.77, p = 0.007). Multiple linear regression analysis showed a relationship between LEPR 223Arg, increased waist circumference, and leptinemia (p < 0.05), while LEPR 109Arg was associated with high total cholesterol and triglycerides (p < 0.05). LEPR haplotype 3 (AGG: 109Lys/233Arg/656Lys) carriers have increased risk for obesity (OR: 2.56, 95% CI: 1.19-5.49, p = 0.017). Moreover, this haplotype was associated with increased BMI, waist circumference, and leptinemia (p < 0.05). CONCLUSIONS LEPR polymorphisms are associated with obesity, hyperleptinemia, and atherogenic lipid profile, suggesting their potential role for leptin resistance and cardiovascular risk. Moreover, LEPR haplotype 3 confers susceptibility to adiposity and hyperleptinemia in our population.
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Nolan D, Kraus WE, Hauser E, Li YJ, Thompson DK, Johnson J, Chen HC, Nelson S, Haynes C, Gregory SG, Kraus VB, Shah SH. Genome-wide linkage analysis of cardiovascular disease biomarkers in a large, multigenerational family. PLoS One 2013; 8:e71779. [PMID: 23936524 PMCID: PMC3732259 DOI: 10.1371/journal.pone.0071779] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Accepted: 07/03/2013] [Indexed: 12/13/2022] Open
Abstract
Given the importance of cardiovascular disease (CVD) to public health and the demonstrated heritability of both disease status and its related risk factors, identifying the genetic variation underlying these susceptibilities is a critical step in understanding the pathogenesis of CVD and informing prevention and treatment strategies. Although one can look for genetic variation underlying susceptibility to CVD per se, it can be difficult to define the disease phenotype for such a qualitative analysis and CVD itself represents a convergence of diverse etiologic pathways. Alternatively, one can study the genetics of intermediate traits that are known risk factors for CVD, which can be measured quantitatively. Using the latter strategy, we have measured 21 cardiovascular-related biomarkers in an extended multigenerational pedigree, the CARRIAGE family (Carolinas Region Interaction of Aging, Genes, and Environment). These biomarkers belong to inflammatory and immune, connective tissue, lipid, and hemostasis pathways. Of these, 18 met our quality control standards. Using the pedigree and biomarker data, we have estimated the broad sense heritability (H2) of each biomarker (ranging from 0.09–0.56). A genome-wide panel of 6,015 SNPs was used subsequently to map these biomarkers as quantitative traits. Four showed noteworthy evidence for linkage in multipoint analysis (LOD score ≥ 2.6): paraoxonase (chromosome 8p11, 21), the chemokine RANTES (22q13.33), matrix metalloproteinase 3 (MMP3, 17p13.3), and granulocyte colony stimulating factor (GCSF, 8q22.1). Identifying the causal variation underlying each linkage score will help to unravel the genetic architecture of these quantitative traits and, by extension, the genetic architecture of cardiovascular risk.
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Affiliation(s)
- Daniel Nolan
- Center for Human Genetics, Duke University, Durham, North Carolina, United States of America
| | - William E. Kraus
- Department of Medicine, Duke University, Durham, North Carolina, United States of America
| | - Elizabeth Hauser
- Center for Human Genetics, Duke University, Durham, North Carolina, United States of America
| | - Yi-Ju Li
- Center for Human Genetics, Duke University, Durham, North Carolina, United States of America
| | - Dana K. Thompson
- Department of Medicine, Duke University, Durham, North Carolina, United States of America
| | - Jessica Johnson
- Center for Human Genetics, Duke University, Durham, North Carolina, United States of America
| | - Hsiang-Cheng Chen
- Division of Rheumatology, Immunology and Allergy, Tri-Service General Hospital, Taipei, Taiwan
| | - Sarah Nelson
- Department of Biostatistics, University of Washington, Seattle, Washington, United States of America
| | - Carol Haynes
- Center for Human Genetics, Duke University, Durham, North Carolina, United States of America
| | - Simon G. Gregory
- Center for Human Genetics, Duke University, Durham, North Carolina, United States of America
| | - Virginia B. Kraus
- Department of Medicine, Duke University, Durham, North Carolina, United States of America
| | - Svati H. Shah
- Center for Human Genetics, Duke University, Durham, North Carolina, United States of America
- Department of Medicine, Duke University, Durham, North Carolina, United States of America
- * E-mail:
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Fourati M, Mnif M, Kharrat N, Charfi N, Kammoun M, Fendri N, Sessi S, Abid M, Rebai A, Fakhfakh F. Association between Leptin gene polymorphisms and plasma leptin level in three consanguineous families with obesity. Gene 2013; 527:75-81. [PMID: 23751306 DOI: 10.1016/j.gene.2013.05.064] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2013] [Accepted: 05/27/2013] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Leptin (LEP) gene is one of the most promising candidate genes for obesity. Previous studies have tested the association of polymorphisms in LEP gene with obesity and obesity-related metabolic biomarkers (anthropometric variables, glucose, insulin level, leptin level and lipid profile). However, the results of these studies were still controversial. To determine whether LEP gene is associated with obesity in Tunisian population, we performed a family-based association study between LEP polymorphisms and obesity and obesity-related metabolic biomarkers. METHODS Seven single nucleotide polymorphisms (SNPs) in 5' region of LEP gene were genotyped in three consanguineous families including 33 individuals. The previously reported LEP SNPs (H1328084, H1328082, rs10487506, H1328081, H1328080, G-2548A and A19G) were evaluated by PCR-RFLP and direct sequencing methods. Single SNP association and haplotype association analyses were performed using the family-based association test (FBAT). To determine allele frequencies of these SNPs in general population, 52 unrelated individuals from the general Tunisian population were also analyzed. RESULTS Two SNPs showed significant associations with plasma leptin level (H1328084: A>G, Z=2.058, p=0.039; A19G: G>A, Z=2.058, p=0.039). When haplotypes were constructed with these two-markers, the risk AA haplotype (frequency 57.1%) was positively associated with plasma leptin level (Z=2.058, p=0.039). Moreover, SNPs H1328084 and A19G are predicted to modify transcription-factor binding sites. CONCLUSIONS Our study provided that two functional variants in 5' regulatory region of LEP gene are associated with plasma leptin level as a quantitative trait. It suggested that H1328084 and A19G have an important role in regulating plasma leptin level.
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Affiliation(s)
- Mouna Fourati
- Laboratory of Human Molecular Genetics, Faculty of Medicine, University of Sfax, Tunisia.
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Wang SH, Chen WJ, Chuang LM, Hsiao PC, Liu PH, Hsiao CK. Inference of cross-level interaction between genes and contextual factors in a matched case-control metabolic syndrome study: a Bayesian approach. PLoS One 2013; 8:e56693. [PMID: 23437214 PMCID: PMC3577698 DOI: 10.1371/journal.pone.0056693] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Accepted: 01/14/2013] [Indexed: 11/18/2022] Open
Abstract
Genes, environment, and the interaction between them are each known to play an important role in the risk for developing complex diseases such as metabolic syndrome. For environmental factors, most studies focused on the measurements observed at the individual level, and therefore can only consider the gene-environment interaction at the same individual scale. Indeed the group-level (called contextual) environmental variables, such as community factors and the degree of local area development, may modify the genetic effect as well. To examine such cross-level interaction between genes and contextual factors, a flexible statistical model quantifying the variability of the genetic effects across different categories of the contextual variable is in need. With a Bayesian generalized linear mixed-effects model with an unconditional likelihood, we investigate whether the individual genetic effect is modified by the group-level residential environment factor in a matched case-control metabolic syndrome study. Such cross-level interaction is evaluated by examining the heterogeneity in allelic effects under various contextual categories, based on posterior samples from Markov chain Monte Carlo methods. The Bayesian analysis indicates that the effect of rs1801282 on metabolic syndrome development is modified by the contextual environmental factor. That is, even among individuals with the same genetic component of PPARG_Pro12Ala, living in a residential area with low availability of exercise facilities may result in higher risk. The modification of the group-level environment factors on the individual genetic attributes can be essential, and this Bayesian model is able to provide a quantitative assessment for such cross-level interaction. The Bayesian inference based on the full likelihood is flexible with any phenotype, and easy to implement computationally. This model has a wide applicability and may help unravel the complexity in development of complex diseases.
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Affiliation(s)
- Shi-Heng Wang
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan
| | - Wei J. Chen
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan
- Genetic Epidemiology Core Laboratory, Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
- Department of Public Health, College of Public Health, National Taiwan University, Taipei, Taiwan
| | - Lee-Ming Chuang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Po-Chang Hsiao
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan
- Genetic Epidemiology Core Laboratory, Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
| | - Pi-Hua Liu
- Clinical Informatics and Medical Statistics Research Center, Chang Gung University, Guishan, Taiwan
| | - Chuhsing K. Hsiao
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan
- Department of Public Health, College of Public Health, National Taiwan University, Taipei, Taiwan
- Bioinformatics and Biostatistics Core, Center of Genomic Medicine, National Taiwan University, Taipei, Taiwan
- * E-mail:
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Abstract
It has long been known that there is a genetic component to obesity, and that characterizing this underlying factor would likely offer the possibility of better intervention in the future. Monogenic obesity has proved to be relatively straightforward, with a combination of linkage analysis and mouse models facilitating the identification of multiple genes. In contrast, genome-wide association studies have successfully revealed a variety of genetic loci associated with the more common form of obesity, allowing for very strong consensus on the underlying genetic architecture of the phenotype for the first time. Although a number of significant findings have been made, it appears that very little of the apparent heritability of body mass index has actually been explained to date. New approaches for data analyses and advances in technology will be required to uncover the elusive missing heritability, and to aid in the identification of the key causative genetic underpinnings of obesity.
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Affiliation(s)
- Qianghua Xia
- Division of Human Genetics, The Children's Hospital of Philadelphia Research Institute, Philadelphia, PA 19104, USA
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Pérusse L, Rankinen T, Zuberi A, Chagnon YC, Weisnagel SJ, Argyropoulos G, Walts B, Snyder EE, Bouchard C. The Human Obesity Gene Map: The 2004 Update. ACTA ACUST UNITED AC 2012; 13:381-490. [PMID: 15833932 DOI: 10.1038/oby.2005.50] [Citation(s) in RCA: 212] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This paper presents the eleventh update of the human obesity gene map, which incorporates published results up to the end of October 2004. Evidence from single-gene mutation obesity cases, Mendelian disorders exhibiting obesity as a clinical feature, transgenic and knockout murine models relevant to obesity, quantitative trait loci (QTLs) from animal cross-breeding experiments, association studies with candidate genes, and linkages from genome scans is reviewed. As of October 2004, 173 human obesity cases due to single-gene mutations in 10 different genes have been reported, and 49 loci related to Mendelian syndromes relevant to human obesity have been mapped to a genomic region, and causal genes or strong candidates have been identified for most of these syndromes. There are 166 genes which, when mutated or expressed as transgenes in the mouse, result in phenotypes that affect body weight and adiposity. The number of QTLs reported from animal models currently reaches 221. The number of human obesity QTLs derived from genome scans continues to grow, and we have now 204 QTLs for obesity-related phenotypes from 50 genome-wide scans. A total of 38 genomic regions harbor QTLs replicated among two to four studies. The number of studies reporting associations between DNA sequence variation in specific genes and obesity phenotypes has also increased considerably with 358 findings of positive associations with 113 candidate genes. Among them, 18 genes are supported by at least five positive studies. The obesity gene map shows putative loci on all chromosomes except Y. Overall, >600 genes, markers, and chromosomal regions have been associated or linked with human obesity phenotypes. The electronic version of the map with links to useful publications and genomic and other relevant sites can be found at http://obesitygene.pbrc.edu.
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Affiliation(s)
- Louis Pérusse
- Division of Kinesiology, Department of Social and Preventive Medicine, Faculty of Medicine, Laval University, Sainte-Foy, Québec, Canada
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Dahlman I, Arner P. Genetics of adipose tissue biology. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2011; 94:39-74. [PMID: 21036322 DOI: 10.1016/b978-0-12-375003-7.00003-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Adipose tissue morphology and release of free fatty acids, as well as peptide hormones, are believed to contribute to obesity and related metabolic disorders. These adipose tissue phenotypes are influenced by adiposity, but there is also a strong hereditary impact. Polymorphisms in numerous adipose-expressed genes have been evaluated for association with adipocyte and clinical phenotypes. In our opinion, some results are convincing. Thus ADRB2 and GPR74 genes are associated with adipocyte lipolysis, GPR74 also with BMI; PPARG and SREBP1, which promote adipogenesis and lipid storage, are associated with T2D and possible adiposity; ADIPOQ and ARL15 are associated with circulating levels of adiponectin, ARL15 also with coronary heart disease. We anticipate that the use of complementary approaches such as expression profiling and RNAi screening, and studies of additional levels of gene regulation, that is, miRNA and epigenetics, will be important to unravel the genetics of adipose tissue function.
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Abd El-Aziz TA, Mohamed RH, Mohamed RH, Pasha HF. Leptin, leptin gene and leptin receptor gene polymorphism in heart failure with preserved ejection fraction. Heart Vessels 2011; 27:271-9. [PMID: 21584748 DOI: 10.1007/s00380-011-0152-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Accepted: 04/15/2011] [Indexed: 12/25/2022]
Abstract
Heart failure with a normal ejection fraction (HFNEF) is common in obesity and coronary artery disease (CAD). Both ischemia and reperfusion induce leptin (LEP) and leptin receptor (LEPR) gene expression. We aimed to investigate the possible associations of serum leptin, leptin gene and leptin receptor gene polymorphism with HFNEF in patients with CAD. 100 Egyptian CAD patients with HFNEF and 100 healthy subjects (the control group) were genotyped for LEP and LEPR polymorphism. Leptin levels were measured. Serum leptin levels were significantly increased in patients compared to the control group. There was a significant increase in the leptin gene (AA genotype) and the leptin receptor gene (RR genotype) in HFNEF patients compared to the control group. Leptin levels, leptin gene (AA genotype) and LEPR (RR genotype) were more associated with NYHA III than with NYHA I and II. We thus concluded that HFNEF is associated with increased serum leptin levels, and the LEP AA genotype or LEPR RR genotype carries at least a threefold increased risk of developing HFNEF.
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Affiliation(s)
- Tarek A Abd El-Aziz
- Cardiology Department, Faculty of Medicine, Zagazig University, 28-El-Galaa Street, Zagazig, Egypt.
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Association study of BMP4, IL6, Leptin, MMP3, and MTNR1B gene promoter polymorphisms and adolescent idiopathic scoliosis. Spine (Phila Pa 1976) 2011; 36:E123-30. [PMID: 21228692 DOI: 10.1097/brs.0b013e318a511b0e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN a genetic association study was performed on 126 patients with adolescent idiopathic scoliosis and 197 healthy controls from independent Hungarian pedigrees. OBJECTIVE to reveal implication of promoter polymorphisms of bone morphogenetic protein 4 (BMP4), interleukin-6 (IL6), leptin, matrix metalloproteinase-3 (MMP3), melatonin 1B receptor (MTNR1B) genes in adolescent idiopathic scoliosis (AIS). Combinatorial association of these candidate genes was also studied to detect additive effect of certain single-nucleotide polymorphism (SNP) patterns. SUMMARY OF BACKGROUND DATA it was previously unraveled that IL6, MMP3, and MTNR1B genes could be considered as predisposition genes of AIS. Since BMP4 and leptin play a central role in bone formation and remodeling and are in direct interaction with melatonin, IL6, and MMP3, these also can be potential predisposition genes. METHODS the genotyping was determined by polymerase chain reaction-restriction fragment length polymorphism. RESULTS at a single gene level, no significant differences were found for allele and genotype frequencies of the polymorphisms of these genes between cases or controls; therefore, the formerly detected association of IL6, MMP3, and MTNR1B with AIS was not confirmed in the Hungarian population by independent SNP analysis. However, significantly increased AIS risk was observed at particular combinations of genotypes of paired SNPs of the candidate genes. CONCLUSIONS the genetic effect of promoter polymorphisms of BMP4, IL6, leptin, MMP3, and MTNR1B can be synergistic for susceptibility to AIS. The combinatorial effect can modulate the final biological impact of many susceptibility polymorphisms; therefore, this should be considered at the comparison of results from case-control studies of different populations.
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Enns JE, Taylor CG, Zahradka P. Variations in Adipokine Genes AdipoQ, Lep, and LepR are Associated with Risk for Obesity-Related Metabolic Disease: The Modulatory Role of Gene-Nutrient Interactions. J Obes 2011; 2011:168659. [PMID: 21773001 PMCID: PMC3136149 DOI: 10.1155/2011/168659] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2011] [Accepted: 03/10/2011] [Indexed: 02/08/2023] Open
Abstract
Obesity rates are rapidly increasing worldwide and facilitate the development of many related disease states, such as cardiovascular disease, the metabolic syndrome, type 2 diabetes mellitus, and various types of cancer. Variation in metabolically important genes can have a great impact on a population's susceptibility to becoming obese and/or developing related complications. The adipokines adiponectin and leptin, as well as the leptin receptor, are major players in the regulation of body energy homeostasis and fat storage. This paper summarizes the findings of single nucleotide polymorphisms in these three genes and their effect on obesity and metabolic disease risk. Additionally, studies of gene-nutrient interactions involving adiponectin, leptin, and the leptin receptor are highlighted to emphasize the critical role of diet in susceptible populations.
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Affiliation(s)
- Jennifer Emily Enns
- Department of Physiology, University of Manitoba and Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Research Centre, 351 Tache Ave, Winnipeg, Manitoba, Canada R2H 2A6
| | - Carla G. Taylor
- Departments of Human Nutritional Sciences and Physiology, University of Manitoba, 351 Tache Ave, Winnipeg, Manitoba, Canada R2H 2A6
| | - Peter Zahradka
- Departments of Physiology and Human Nutritional Sciences, University of Manitoba and Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Research Centre, 351 Tache Ave, Winnipeg, Manitoba, Canada R2H 2A6
- *Peter Zahradka:
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Yako Y, Fanampe B, Hassan M, Erasmus R, van der Merwe L, van Rensburg S, Matsha T. Association of Cocaine- and Amphetamine-Related Transcript, Leptin and Leptin Receptor Gene Polymorphisms with Anthropometric Obesity Phenotype Indicators in South African Learners. JOURNAL OF NUTRIGENETICS AND NUTRIGENOMICS 2011; 4:210-21. [DOI: 10.1159/000329614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 05/25/2011] [Indexed: 11/19/2022]
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Winkler S, Picó C, Ahrens W. [Physiological mechanisms in the development of adiposity]. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2010; 53:681-9. [PMID: 20652482 DOI: 10.1007/s00103-010-1089-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The phenomenon of the so-called "obesity pandemic" having arisen over the last decades has to be, in large part, attributed to changes of lifestyle and the associated changes in dietary habits and physical activity observed world-wide. The resulting interference in energy homeostasis plays a central role in the development of obesity in a large proportion of the population worldwide. In this article, current knowledge about central biological mechanisms of energy intake, energy storage, and energy expenditure is summarized. This includes, for example, the feeling of hunger/satiety, lipid turnover with the two components of lipolysis and lipogenesis, adipogenesis, as well as energy-consuming processes like (adaptive) thermogenesis, resting metabolic rate, and physical activity energy expenditure. Based on examples, the possible influence of genetic polymorphisms contributing to the development of adiposity are illustrated.
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Affiliation(s)
- S Winkler
- Bremer Institut für Präventionsforschung und Sozialmedizin, Universität Bremen, Linzer Str. 10, 28359, Bremen, Deutschland.
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Perez-Iglesias R, Mata I, Amado JA, Berja A, Garcia-Unzueta MT, Martínez García O, Arranz MJ, Vazquez-Barquero JL, Crespo-Facorro B. Effect of FTO, SH2B1, LEP, and LEPR polymorphisms on weight gain associated with antipsychotic treatment. J Clin Psychopharmacol 2010; 30:661-6. [PMID: 21105276 DOI: 10.1097/jcp.0b013e3181fae248] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Weight gain is one of the major adverse effects of antipsychotics. Although mechanisms remain unclear, genetic susceptibility has become increasingly attractive as a potential mechanism that could explain a significant part of interindividual variability. Most investigations have explored genes related with the mechanism of action of antipsychotic drugs. An alternative approach to investigate the role that genetic factors play in weight gain secondary to antipsychotic treatment is to study those genetic variants that have been found associated with obesity. The aim of this study was to determine whether the fat mass and obesity-associated gene (FTO) rs9939609 variant, the single nucleotide polymorphism that has shown the strongest association with common obesity in different populations, influences weight gain during the first year of antipsychotic treatment. We investigated also the genetic variants in other 3 strong candidates genes involved in the leptin-signaling pathway including leptin, leptin receptor, and Src homology 2. We carried out a prospective study on 239 patients with first-episode psychosis. Two hundred five patients completed the follow-up at 1 year (85.8%). Before antipsychotic treatment, the homozygous subjects for the risk allele A of the FTOrs9939609 variant had a higher body mass index at baseline (24.2 T 3.8 kg/m²) than the AT/TT group (22.82 T 3.3 kg/m2; F = 5.744; P = 0.018). After 1 year, the magnitude of weight increase was similar in the 3 genotypes defined by the rs9939609 variant. These results suggest that the pharmacological intervention accompanied by changes in energy intake and expenditure could suppress the genetic susceptibility conferred by the FTO genotype. None of the other single nucleotide polymorphisms evaluated were associated with weight gain during the first 12 months of antipsychotic therapy.
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Affiliation(s)
- Rocio Perez-Iglesias
- Department of Psychiatry, Marqués de Valdecilla University Hospital, Planta 2(a), Edificio 2 de Noviembre, Avda. Valdecilla s/n, 39008 Santander, Spain.
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Hinuy HM, Hirata MH, Sampaio MF, Armaganijan D, Arazi SS, Salazar LA, Hirata RDC. Relationship between variants of the leptin gene and obesity and metabolic biomarkers in Brazilian individuals. ACTA ACUST UNITED AC 2010; 54:282-8. [PMID: 20520958 DOI: 10.1590/s0004-27302010000300006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Accepted: 11/05/2009] [Indexed: 01/25/2023]
Abstract
OBJECTIVE The relationship between variants of the leptin gene (LEP) and obesity and metabolic biomarkers was investigated in Brazilian individuals. SUBJECTS AND METHODS One-hundred-ten obese (BMI > 30 kg/m(2)) and 100 non-obese individuals (145 women and 65 men, aged 49 +/- 14 years) were randomly selected. Plasma leptin, glycemia, serum lipid measurements and LEP -2548G>A and 3'HVR polymorphisms were analyzed. RESULTS The LEP -2548GG genotype was associated with a 2.2% and 2.0% increase in BMI (p = 0.009) and plasma leptin (p = 0.031), respectively. 3'HVR I/II (classes I/I+I/II) genotypes contributed with 1.8% of BMI values (p = 0.046). LEP I/G combined genotypes (I/IGG, I/IGA and I/IIGG) were associated with obesity, and increased BMI, waist circumference, leptin and triglycerides (p < 0.05). These relationships were found in women (p < 0.05) but not in men. LEP I/G combined genotypes were not associated with hypertension, hyperglycemia, dyslipidemia and coronary artery disease. CONCLUSIONS LEP I/G combined genotypes are associated with obesity-related metabolic biomarkers and phenotype in a gender-dependent manner.
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Erez G, Tirosh A, Rudich A, Meiner V, Schwarzfuchs D, Sharon N, Shpitzen S, Blüher M, Stumvoll M, Thiery J, Fiedler GM, Friedlander Y, Leiterstdorf E, Shai I. Phenotypic and genetic variation in leptin as determinants of weight regain. Int J Obes (Lond) 2010; 35:785-792. [PMID: 21042325 DOI: 10.1038/ijo.2010.217] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
AIMS Over 75% of obese subjects fail to maintain their weight following weight loss interventions. We aimed to identify phenotypic and genetic markers associated with weight maintenance/regain following a dietary intervention. SUBJECTS AND METHODS In the 2-year Dietary Intervention Randomized Controlled Trial, we assessed potential predictors for weight changes during the 'weight loss phase' (0-6 months) and the 'weight maintenance/regain phase' (7-24 months). Genetic variation between study participants was studied using single-nucleotide polymorphisms in the leptin gene (LEP). RESULTS Mean weight reduction was -5.5% after 6 months, with a mean weight regain of 1.2% of baseline weight during the subsequent 7-24 months. In a multivariate regression model, higher baseline high-molecular-weight adiponectin was the only biomarker predictor of greater success in 0- to 6-month weight loss (β = -0.222, P-value = 0.044). In a multivariate regression model adjusted for 6-month changes in weight and various biomarkers, 6-month plasma leptin reduction exhibited the strongest positive association with 6-month weight loss (β = 0.505, P-value < 0.001). Conversely, 6-month plasma leptin reduction independently predicted weight regain during the following 18 months (β = -0.131, P-value < 0.013). Weight regain was higher among participants who had a greater (top tertiles) 6-month decrease in both weight and leptin (+3.4% (95% confidence interval 2.1-4.8)) as compared with those in the lowest combined tertiles (+0.2% (95% confidence interval -1.1 to 1.4)); P-value < 0.001. Weight regain was further significantly and independently associated with genetic variations in LEP (P = 0.006 for both rs4731426 and rs2071045). Adding genetic data to the phenotypic multivariate model increased its predictive value for weight regain by 34%. CONCLUSION Although greater reduction in leptin concentrations during the initial phase of a dietary intervention is associated with greater weight loss in the short term, plasma leptin reduction, combined with the degree of initial weight loss and with genetic variations in the LEP gene, constitutes a significant predictor of subsequent long-term weight regain.
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Affiliation(s)
- G Erez
- Obesity Clinic, Meuhedet Health Services, Jerusalem, Israel
| | - A Tirosh
- Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.,Talpiot Medical Leadership Program, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | - A Rudich
- The S. Daniel Abraham Center for Health and Nutrition, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - V Meiner
- Department of Human Genetics, Hadassah-University Hospital, Jerusalem, Israel
| | | | - N Sharon
- Unit of Epidemiology, Hebrew University-Hadassah School of Public Health, Jerusalem, Israel
| | - S Shpitzen
- Center for Research, Prevention and Treatment of Atherosclerosis, Hadassah-University Hospital, Jerusalem, Israel
| | - M Blüher
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - M Stumvoll
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - J Thiery
- Institute of Laboratory Medicine, University of Leipzig, Leipzig, Germany
| | - G M Fiedler
- Institute of Laboratory Medicine, University of Leipzig, Leipzig, Germany
| | - Y Friedlander
- Unit of Epidemiology, Hebrew University-Hadassah School of Public Health, Jerusalem, Israel
| | - E Leiterstdorf
- Center for Research, Prevention and Treatment of Atherosclerosis, Hadassah-University Hospital, Jerusalem, Israel
| | - I Shai
- The S. Daniel Abraham Center for Health and Nutrition, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Friedlander Y, Li G, Fornage M, Williams OD, Lewis CE, Schreiner P, Pletcher MJ, Enquobahrie D, Williams M, Siscovick DS. Candidate molecular pathway genes related to appetite regulatory neural network, adipocyte homeostasis and obesity: results from the CARDIA Study. Ann Hum Genet 2010; 74:387-98. [PMID: 20642810 PMCID: PMC2945878 DOI: 10.1111/j.1469-1809.2010.00596.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Appetite regulatory neural network and adipocyte homeostasis molecular pathways are critical to long-term weight maintenance. Associations between obesity-related phenotypes and four genes in these pathways - leptin (LEP), leptin receptor (LEPR), neuropeptide Y2 receptor (NPY2R) and peptide YY (PYY) were examined in CARDIA Study participants (aged 18-30 at recruitment in 1985-6). Weight, BMI and waist circumference were measured at baseline and at years 2, 5, 7, 10, 15, and 20. Genotyping was conducted using tag SNPs characterising common genetic variations in these genes. Generalized estimating equation (GEE) models estimated associations between SNPs and repeated anthropometric measurements, controlling for sex and age. False discovery rate was used to adjust for multiple testing. In African-Americans, SNPs across the LEP gene demonstrated significant overall associations with all obesity-related phenotypes. The associations between LEP rs17151919 with weight tended to strengthen with time - the difference in weight associated with each additional minor allele increased from 2.6 kg at baseline to 4.8 kg at year 20 (SNP*time interaction p = 0.0193). NPY2R gene SNPs were associated with waist circumference among African-American men (p = 0.0462). In Caucasians, LEP SNPs also tended to be associated with weight (p = 0.0471), and PYY rs11684664 was associated with obesity-related phenotypes in women only (p = 0.010-0.026). Several LEP, and NPY2R and PYY SNPs were associated with obesity-related phenotypes in young adults, particularly among African-Americans.
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Affiliation(s)
- Yechiel Friedlander
- Unit of Epidemiology, Hebrew University-Hadassah School of Public Health, Jerusalem, Israel.
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Riestra P, Garcia-Anguita A, Viturro E, Schoppen S, De Oya M, Garcés C. Influence of the leptin G-2548A polymorphism on leptin levels and anthropometric measurements in healthy Spanish adolescents‡. Ann Hum Genet 2010; 74:335-9. [DOI: 10.1111/j.1469-1809.2010.00586.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Laramie JM, Wilk JB, Williamson SL, Nagle MW, Latourelle JC, Tobin JE, Province MA, Borecki IB, Myers RH. Multiple genes influence BMI on chromosome 7q31-34: the NHLBI Family Heart Study. Obesity (Silver Spring) 2009; 17:2182-9. [PMID: 19461589 DOI: 10.1038/oby.2009.141] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The National Heart, Lung, and Blood Institute Family Heart Study (FHS) genome-wide linkage scan identified a region of chromosome 7q31-34 with a lod score of 4.9 for BMI at D7S1804 (131.9 Mb). We report the results of linkage and association to BMI in this region for two independent FHS samples. The first sample includes 225 FHS pedigrees with evidence of linkage to 7q31-34, using 1,132 single-nucleotide polymorphisms (SNPs) and 7 microsatellites. The second represents a case-control sample (318 cases; BMI >25 and 325 controls; BMI <25) derived from unrelated FHS participants who were not part of the genome scan. The latter set was genotyped for 606 SNPs, including 37 SNPs with prior evidence for association in the linked families. Although variance components linkage analysis using only SNPs generated a peak lod score that coincided with the original linkage scan at 131.9 Mb, a conditional linkage analysis showed evidence of a second quantitative trait locus (QTL) near 143 cM influencing BMI. Three SNPs (rs161339, rs12673281, and rs1993068) located near the three genes pleiotrophin (PTN), diacylglycerol (DAG) kinase iota (DGK iota), and cholinergic receptor, muscarinic 2 (CHRM2) demonstrated significant association in both linked families (P = 0.0005, 0.002, and 0.03, respectively) and the case-control sample (P = 0.01, 0.0003, and 0.03, respectively), regardless of the genetic model tested. These findings suggest that several genes may be associated with BMI in the 7q31-34 region.
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Affiliation(s)
- Jason M Laramie
- Department of Neurology, Boston University School of Medicine, Boston, Massachusetts, USA.
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Abstract
The last few years have seen major advances in common non-syndromic obesity research, much of it the result of genetic studies. This Review outlines the competing hypotheses about the mechanisms underlying the genetic and physiological basis of obesity, and then examines the recent explosion of genetic association studies that have yielded insights into obesity, both at the candidate gene level and the genome-wide level. With obesity genetics now entering the post-genome-wide association scan era, the obvious question is how to improve the results obtained so far using single nucleotide polymorphism markers and how to move successfully into the other areas of genomic variation that may be associated with common obesity.
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Ma D, Feitosa MF, Wilk JB, Laramie JM, Yu K, Leiendecker-Foster C, Myers RH, Province MA, Borecki IB. Leptin is associated with blood pressure and hypertension in women from the National Heart, Lung, and Blood Institute Family Heart Study. Hypertension 2009; 53:473-9. [PMID: 19204185 DOI: 10.1161/hypertensionaha.108.118133] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Leptin is a key neuroendocrine hormone regulating food intake, metabolism, and fat accumulation, and it may also affect blood pressure and contribute to hypertension through sympathetic activation in the vasculature or at the renal level. Although previous studies have shown that the distribution of leptin is significantly different between males and females, as is the risk of hypertension between males and females, results regarding the role of leptin in the gender-specific regulation of blood pressure are controversial. Thus, we performed family-based association analyses in the National Heart, Lung, and Blood Institute Family Heart Study to test the hypothesis that LEPTIN gene variants and the plasma leptin level influence variability in blood pressure and the risk of hypertension differently by gender. We identified significant associations between LEPTIN single nucleotide polymorphisms with blood pressure and hypertension, but in postmenopausal women only. We also identified significant associations between plasma leptin levels and both blood pressure and hypertension in women. The current study supports a role for LEPTIN and plasma leptin levels in blood pressure regulation in women. It also provides insight into the gender differences in hypertension, as well as the differential distribution and activity of leptin in men and women.
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Affiliation(s)
- Duanduan Ma
- Division of Statistical Genomics, Washington University School of Medicine, St. Louis, MO 63108, USA
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Ben Ali S, Kallel A, Ftouhi B, Sediri Y, Feki M, Slimane H, Jemaa R, Kaabachi N. The -2548G/A LEP polymorphism is associated with blood pressure in Tunisian obese patients. Blood Press 2009; 17:278-83. [PMID: 18923972 DOI: 10.1080/08037050802488960] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OBJECTIVE To examine the association of a common -2548G/A (rs7799039) promoter variant of the human leptin gene (LEP) with obesity or body mass index (BMI) and its associated phenotypes such as blood pressure variability and the prevalence of hypertension in a sample of the Tunisian population. DESIGN AND METHODS Two hundred and twenty-nine obese patients were screened and compared with 251 normal weight subjects. The -2548G/A LEP polymorphism was analysed by PCR-RFLP procedure. RESULTS No significant association was found between the -2548G/A polymorphism and obesity or BMI. However, in obese patients subjects with AA genotype had significantly higher systolic (p = 0.003) and diastolic (p = 0.002) blood pressure compared with those with GA or GG genotypes. Stratified analysis by gender revealed that male patients but not female homozygous for -2548A allele exhibited significantly increased systolic (p = 0.01) and diastolic (p<0.001) blood pressure than did carriers of -2548G allele. Multiple linear regression analysis revealed that AA genotype significantly affect systolic and diastolic blood pressure in obese men. Additionally, significant association between AA genotype and higher prevalence of hypertension was found in male patients (p = 0.03). CONCLUSION The present study showed that the -2548G/A LEP polymorphism is associated with blood pressure in obese male patients.
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Affiliation(s)
- S Ben Ali
- Research Laboratory LAB-SM-01, Biochemistry Department, Rabta Hospital, Tunis, Tunisia
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Moore SC, Leitzmann MF, Albanes D, Weinstein SJ, Snyder K, Virtamo J, Ahn J, Mayne ST, Yu H, Peters U, Gunter MJ. Adipokine genes and prostate cancer risk. Int J Cancer 2009; 124:869-76. [PMID: 19035456 DOI: 10.1002/ijc.24043] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Adiposity and adipocyte-derived cytokines have been implicated in prostate carcinogenesis. However, the relationship of adipokine gene variants with prostate cancer risk has not been thoroughly investigated. We therefore examined common variants of the IL6, LEP, LEPR, TNF and ADIPOQ genes in relation to prostate cancer in a case-control study nested within a large cohort of Finnish men. The study sample consisted of 1,053 cases of prostate cancer, diagnosed over an average 11 years of follow up, and 1,053 controls matched to the cases on age, intervention group and date of baseline blood draw. Logistic regression was used to model the relative odds of prostate cancer. We also examined genotypes in relation to serum insulin, IGF-1 and IGF-1:IGFBP-3 among 196 controls. Variant alleles at three loci (-14858A>G, -13973A>C, -13736C>A) in a potential regulatory region of the LEP gene conferred a statistically significant 20% reduced risk of prostate cancer. For example, at the -14858A>G locus, heterozygotes and homozygotes for the A allele had an odds ratio (OR) of prostate cancer of 0.76 [95% confidence interval (CI) 0.62, 0.93] and 0.79 (95% CI 0.60, 1.04), respectively. At 13288G>A, relative to the GG genotype, the AA genotype was associated with a suggestive increased risk of prostate cancer (OR = 1.29; 95% CI 0.99,1.67; p(trend) = 0.05). Polymorphisms in the IL6, LEPR, TNF and ADIPOQ genes were not associated with prostate cancer. Allelic variants in the LEP gene are related to prostate cancer risk, supporting a role for leptin in prostate carcinogenesis.
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Affiliation(s)
- Steven C Moore
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892, USA.
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Feitosa MF, Myers RH, Pankow JS, Province MA, Borecki IB. LIPC variants in the promoter and intron 1 modify HDL-C levels in a sex-specific fashion. Atherosclerosis 2008; 204:171-7. [PMID: 19101670 DOI: 10.1016/j.atherosclerosis.2008.09.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2008] [Revised: 09/03/2008] [Accepted: 09/04/2008] [Indexed: 11/18/2022]
Abstract
We previously reported linkage for plasma levels of high-density lipoprotein cholesterol (HDL-C) on 15q21 in Caucasian families from the National Heart, Lung, and Blood Institute Family Heart Study (NHLBI FHS). Hepatic lipase gene (LIPC), which has a major role in lipoprotein metabolism, resides within the linkage region and constitutes an obvious candidate gene. While hepatic lipase is a known player in HDL metabolism, the relationship between common LIPC variants and HDL-C levels remains unclear. In the current study, we employed population-based and family-based tests of association with both quantitative HDL-C levels and a dichotomous dyslipidemia trait (affected men: HDL<40 mg/dL and women: HDL<50 mg/dL, denoted as low HDL). We genotyped 19 tag-SNPs spanning 139.9 kb around the LIPC in the 591 families (2238 subjects). Strong association in a proxy-promoter 5' SNP (rs261342) and HDL-C levels was detected in women, but not in men. The less common allele was associated with an increase of approximately 14% in HDL-C levels, and a decrease of approximately 30% in risk of low HDL. In addition, strong association in women of an intron 1 SNP (rs12593008) and low HDL and moderate association in men (rs8028759) with both HDL-C levels and low HDL phenotype were found and may represent either functional single nucleotide polymorphisms (SNPs), or more likely, SNPs in linkage disequilibrium with functional variants. Because of the association of lipid abnormalities with diabetes, and other lifestyle parameters, we also performed association analyses using different covariate adjustments as well as strategically selected sub-samples. The sex-specific association of rs261342, rs12593008 or rs8028759 remained substantially the same through these analyses. Finally, we found that a common haplotype was overtransmitted to offspring with low HDL-C. The sex-specific associations found in our study could be due to the interactions with the endogenous hormonal environment, lifestyle and/or genetic factors, although the underlying physiologic mechanisms are not understood.
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Affiliation(s)
- Mary F Feitosa
- Division of Statistical Genomics, Center for Genome Sciences, Washington University School of Medicine, St. Louis, MO, 63108-2212, USA.
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Hinuy HM, Hirata MH, Forti N, Diament J, Sampaio MF, Armaganijan D, Salazar LA, Hirata RDC. Leptin G-2548A promoter polymorphism is associated with increased plasma leptin and BMI in Brazilian women. ACTA ACUST UNITED AC 2008; 52:611-6. [DOI: 10.1590/s0004-27302008000400006] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2008] [Accepted: 03/06/2008] [Indexed: 12/19/2022]
Abstract
Variants in leptin gene (LEP) have been implicated in the pathogenesis of obesity. The relationship between LEP G-2548A polymorphism and obesity-related traits was evaluated in a sample of Brazilian women (n = 228) who were randomly selected from two clinical centers in Sao Paulo city. Blood samples were collected for DNA extraction, plasma leptin and serum lipids measurements. LEP G-2548A genotypes were identified by a PCR- RFLP strategy using the endonuclease Alw44I. LEP G-2548A was associated with obesity after adjustment for covariates (age, hypertension, coronary artery disease, smoking and physical activity). Women carrying G allele had a four times higher risk of obesity than the A allele carriers (OR: 4.11, CI95%: 1.06-15.90, p = 0.041). G allele was also related to increased plasma leptin (p = 0.024) and body mass index (p = 0.027). Hypertension, hyperglycemia, dyslipidemia and coronary artery disease were associated with obesity. However LEP G-2548A polymorphism was not related to these variables. All together these data suggest that LEP G-2548A polymorphism has an important role in regulating plasma leptin levels and body mass index in women.
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Common SNPs in LEP and LEPR associated with birth weight and type 2 diabetes-related metabolic risk factors in twins. Int J Obes (Lond) 2008; 32:1233-9. [PMID: 18490929 DOI: 10.1038/ijo.2008.68] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Children born small for gestational age are at increased risk of developing type 2 diabetes in adulthood. The satiety signal leptin that regulates food intake and energy expenditure might be a possible molecular link, as umbilical cord leptin levels are positively correlated with birth weight. In the present study, we examined whether common single nucleotide polymorphisms (SNPs) in the leptin (LEP; 19G>A) gene and its receptor (LEPR; Q223R and K109R) are associated with birth weight and adult metabolic risk factors for type 2 diabetes in twins. DESIGN SNPs were genotyped in 396 monozygotic and 232 dizygotic twins (286 men and 342 women, mean age 25 years) recruited from the East Flanders Prospective Twin Survey. Data were analysed using linear mixed models. RESULTS The LEPR K109R SNP was associated with birth weight (KK, KR and RR (95% confidence interval, CI): 2511 (2465-2557), 2575 (2516-2635) and 2726 (2606-2845) gram; P(additive)=0.001). Also the LEPR Q223R SNP showed a significant association with weight at birth (QQ, QR and RR (95% CI): 2492 (2431-2554), 2545 (2495-2595) and 2655 (2571-2740) gram; P(additive)=0.003). Furthermore, an interaction between the LEPR K109R and the Q223R SNP on birth weight was observed (P=0.014). G allele carriers of the LEP 19G>A SNP had higher high-density lipoprotein (HDL) cholesterol levels compared to 19A homozygotes (GX vs AA (95% CI): 1.62 (1.58-1.66) vs 1.49 (1.40-1.58) mmol l(-1); P(recessive)=0.013). CONCLUSIONS This study indicates that leptin may act as a growth-promoting signal during fetal development, and suggests a possible role for the LEPR in explaining the inverse relationship between birth weight and the development of metabolic diseases in adulthood. Additionally, these results suggest that the LEP 19G>A SNP affect HDL cholesterol levels.
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Wilk JB, Laramie JM, Latourelle JC, Williamson S, Nagle MW, Tobin JE, Foster CL, Eckfeldt JH, Province MA, Borecki IB, Myers RH. NYD-SP18 is associated with obesity in the NHLBI Family Heart Study. Int J Obes (Lond) 2008; 32:930-5. [PMID: 18317470 DOI: 10.1038/ijo.2008.23] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The NHLBI Family Heart Study (FHS) genome-wide linkage scan identified a region of chromosome 7q with a logarithm of odds score of 4.9 for body mass index (BMI). DESIGN We report the results of fine mapping the linkage peak using 1020 single nucleotide polymorphisms (SNPs) to test for association to obesity in families exhibiting linkage to chromosome 7. Association observed in linked families (284 obese cases/381 controls) was examined in an independent set of unrelated FHS participants (172 obese cases/308 controls) to validate the observed association. Two dichotomous obesity phenotypes were studied based on clinical BMI cutoffs and the sex-specific distribution of both BMI and leptin levels. RESULTS Using a P-value of 0.01 as criteria for association in the linked families, a P-value of 0.05 as criteria for association in the unrelated sample, and requiring consistency in the direction of the effect of the minor allele between the two samples, we identified two coding SNPs in the NYD-SP18 gene with minor alleles increasing the risk of obesity. Adjustment for exercise, smoking and FTO genotype did not influence the result in linked families, but improved the result in the unrelated sample. Carrying a minor allele of the nonsynonymous SNP rs6971091 conferred an odds ratio of at least 2 for obesity defined by both BMI and leptin levels. CONCLUSION The effect of the NYD-SP18 SNP on obesity was larger than the effect of FTO in FHS families. Publicly available results from genome-wide association studies support the association between NYD-SP18 and BMI. The NYD-SP18 gene is described as testes development related, but little is known about the gene's function or the mechanism by which it may influence risk for obesity.
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Affiliation(s)
- J B Wilk
- Department of Neurology, Boston University School of Medicine, Boston, MA 02118, USA.
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