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Tan Q, Yang S, Wang B, Wang M, Yu L, Liang R, Liu W, Song J, Guo Y, Zhou M, Chen W. Gene-environment interaction in long-term effects of polychlorinated biphenyls exposure on glucose homeostasis and type 2 diabetes: The modifying effects of genetic risk and lifestyle. JOURNAL OF HAZARDOUS MATERIALS 2023; 457:131757. [PMID: 37276697 DOI: 10.1016/j.jhazmat.2023.131757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 05/26/2023] [Accepted: 05/30/2023] [Indexed: 06/07/2023]
Abstract
The longitudinal relationships of polychlorinated biphenyls (PCBs) exposure with glucose homeostasis and type 2 diabetes (T2D) risk among Chinese population have not been assessed, and interactions of PCB exposure with genetic susceptibility and lifestyle are unclear. In this prospective cohort study, fasting plasma glucose (FPG) and insulin (FPI) and seven serum indicator-PCBs were measured for each participant. We constructed polygenic risk score (PRS) of T2D and healthy lifestyle score. Each 1-unit increment of ln-transformed PCB-118 was related with a 0.141 mmol/L, 11.410 pmol/L, 0.661, and 74.5% increase in FPG, FPI, homeostasis model assessment of insulin resistance, and incident T2D risk over 6 years, respectively. Each 1-unit increment in T2D-PRS was related with a 0.169 mmol/L elevation of FPG and 65.5% elevation of incident T2D risk during 6 years. Compared with participants who had low T2D-PRS and low PCB-118, participants with high T2D-PRS and high PCB-118 showed a significant increase in FPG (0.162 mmol/L; P for interaction <0.001) and incident T2D risk [hazard ratio (HR)= 2.222]. Participants with low PCB-118, low PRS, and healthy lifestyle had the lowest incident T2D risk (HR=0.232). Our findings highlighted the significance of reducing PCB exposure and improvement in lifestyle for T2D prevention and management, especially for individuals with higher genetic risk of T2D.
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Affiliation(s)
- Qiyou Tan
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Shijie Yang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, Hubei, China
| | - Bin Wang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Mengyi Wang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Linling Yu
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Ruyi Liang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Wei Liu
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Jiahao Song
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Yanjun Guo
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Min Zhou
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Weihong Chen
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China.
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Cardiometabolic Traits in Adult Twins: Heritability and BMI Impact with Age. Nutrients 2022; 15:nu15010164. [PMID: 36615821 PMCID: PMC9824881 DOI: 10.3390/nu15010164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/20/2022] [Accepted: 12/23/2022] [Indexed: 12/31/2022] Open
Abstract
Background: The prevalence of obesity and cardiometabolic diseases continues to rise globally and obesity is a significant risk factor for cardiometabolic diseases. However, to our knowledge, evidence of the relative roles of genes and the environment underlying obesity and cardiometabolic disease traits and the correlations between them are still lacking, as is how they change with age. Method: Data were obtained from the Chinese National Twin Registry (CNTR). A total of 1421 twin pairs were included. Univariate structural equation models (SEMs) were performed to evaluate the heritability of BMI and cardiometabolic traits, which included blood hemoglobin A1c (HbA1c), fasting blood glucose (FBG), systolic blood pressure (SBP), diastolic blood pressure (DBP), total cholesterol (TC), triglycerides (TGs), low-density lipoprotein cholesterol (LDL-C) and high-density lipoprotein cholesterol (HDL-C). Bivariate SEMs were used to assess the genetic/environmental correlations between them. The study population was divided into three groups for analysis: ≤50, 51−60, and >60 years old to assess the changes in heritability and genetic/environmental correlations with ageing. Results: Univariate SEMs showed a high heritability of BMI (72%) and cardiometabolic traits, which ranged from 30% (HbA1c) to 69% (HDL-C). With age increasing, the heritability of all phenotypes has different degrees of declining trends. Among these, BMI, SBP, and DBP presented significant monotonous declining trends. The bivariate SEMs indicated that BMI correlated with all cardiometabolic traits. The genetic correlations were estimated to range from 0.14 (BMI and LDL-C) to 0.39 (BMI and DBP), while the environmental correlations ranged from 0.13 (BMI and TC/LDL-C) to 0.31 (BMI and TG). The genetic contributions underlying the correlations between BMI and SBP and DBP, TC, TG, and HDL-C showed a progressive decrease as age groups increased. In contrast, environmental correlations displayed a significant increasing trend for HbA1c, SBP, and DBP. Conclusions: The findings suggest that genetic and environmental factors have essential effects on BMI and all cardiometabolic traits. However, as age groups increased, genetic influences presented varying degrees of decrement for BMI and most cardiometabolic traits, suggesting the increasing importance of environments. Genetic factors played a consistently larger role than environmental factors in the phenotypic correlations between BMI and cardiometabolic traits. Nevertheless, the relative magnitudes of genetic and environmental factors may change over time.
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Belmouhand M, Rothenbuehler SP, Dabbah S, Bjerager J, Sander B, Hjelmborg JB, Dalgård C, Jensen R, Larsen M. Small hard drusen and associated factors in early seniority. PLoS One 2022; 17:e0279279. [PMID: 36548342 PMCID: PMC9778563 DOI: 10.1371/journal.pone.0279279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 12/02/2022] [Indexed: 12/24/2022] Open
Abstract
PURPOSE The purpose of this study was to examine the ocular and systemic risk profile of the fundus phenotype ≥ 20 small hard (macular) drusen (< 63 μm in diameter). METHODS This single-center, cross-sectional study of 176 same-sex twin pairs aged 30 to 80 (median 60) years was a component of a framework study of the transition from not having age-related macular degeneration to having early AMD. Drusen categories assessed using fundus photography and optical coherence tomography included small hard drusen (diameter < 63 μm), intermediate soft drusen (63-125 μm), and large soft drusen (> 125 μm), of which the soft drusen are compatible with a diagnosis of AMD. RESULTS Having ≥ 20 small hard drusen within or outside the macula was associated with increasing age, lower body mass index, shorter axial length, hyperopia, female sex, increasing high-density lipoprotein (HDL), high alcohol consumption, and with the presence of soft drusen. CONCLUSIONS Having ≥ 20 small hard drusen was associated with some AMD-related risk factors, but not with smoking, increasing body mass index, and higher blood pressure. Having ≥ 20 small hard drusen was also associated with soft drusen, in agreement with previous studies. These findings suggest that small hard drusen are not an early manifestation of AMD but the product of a distinct process of tissue alteration that promotes the development of AMD or some subtype thereof.
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Affiliation(s)
- Mohamed Belmouhand
- Department of Ophthalmology, Rigshospitalet, Copenhagen University Hospital, Glostrup, Denmark
- Faculty of Health and Medical Science, Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
- * E-mail:
| | - Simon P. Rothenbuehler
- Department of Ophthalmology, Rigshospitalet, Copenhagen University Hospital, Glostrup, Denmark
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland
| | - Sami Dabbah
- Department of Ophthalmology, Rigshospitalet, Copenhagen University Hospital, Glostrup, Denmark
| | - Jakob Bjerager
- Department of Ophthalmology, Rigshospitalet, Copenhagen University Hospital, Glostrup, Denmark
| | - Birgit Sander
- Department of Ophthalmology, Rigshospitalet, Copenhagen University Hospital, Glostrup, Denmark
| | - Jacob B. Hjelmborg
- Epidemiology, Biostatistics and Biodemography, Department of Public Health, University of Southern Denmark, Odense, Denmark
- Danish Twin Research Center, University of Southern Denmark, Odense, Denmark
| | - Christine Dalgård
- Danish Twin Research Center, University of Southern Denmark, Odense, Denmark
- Clinical Pharmacology, Pharmacy and Environmental Medicine, Department of Public Health, University of Southern Denmark, Odense, Denmark
| | - Rasmus Jensen
- Epidemiology, Biostatistics and Biodemography, Department of Public Health, University of Southern Denmark, Odense, Denmark
- Department of Mathematics and Computer Science, University of Southern Denmark, Odense, Denmark
| | - Michael Larsen
- Department of Ophthalmology, Rigshospitalet, Copenhagen University Hospital, Glostrup, Denmark
- Faculty of Health and Medical Science, Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Belmouhand M, Rothenbuehler SP, Hjelmborg JB, Dabbah S, Bjerager J, Sander BA, Dalgård C, Larsen M. Heritability of retinal drusen in the Copenhagen Twin Cohort Eye Study. Acta Ophthalmol 2022; 100:e1561-e1568. [PMID: 35322936 PMCID: PMC9790204 DOI: 10.1111/aos.15136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 02/22/2022] [Accepted: 03/12/2022] [Indexed: 12/30/2022]
Abstract
PURPOSE To study age- and sex-adjusted heritability of small hard drusen and early age-related macular degeneration (AMD) in a population-based twin cohort. METHODS This was a single-centre, cross-sectional, classical twin study with ophthalmic examination including refraction, biometry, best-corrected visual acuity assessment, colour and autofluorescence fundus photography, and fundus optical coherence tomography. Grading and categorization of drusen was by diameter and location. RESULTS The study enrolled 176 same-sex pairs of twins of mean (SD) age 58.6 (9.9) years. The prevalence of the four phenotypes ≥20 small hard macular drusen (largest diameter < 63 μm), ≥20 small hard extramacular drusen, intermediate drusen (63-125 μm) anywhere, and large drusen (>125 μm) anywhere was 12.4%, 36.4%, 5.8%, and 8.4%, respectively, and the respective heritabilities, adjusted for age and sex, were 78.2% [73.5-82.9], 69.1% [62.3-75.9], 30.1% [4.1-56.1], and 65.6% [26.4-100]. Age trajectory analysis supported a gradual transition to larger numbers of small hard drusen with increasing age. The heritability of ≥20 small hard drusen was markedly lower than the 99% found in the 40% overlapping twin cohort that was seen 20 years earlier. CONCLUSION Numerous (≥20) small hard drusen and larger drusen that fit the definition of dry AMD were highly heritable. Small hard drusen counts increased with age. Decreasing heritability with increasing age suggests that the impact of behavioural and environmental factors on the development of small hard drusen increases with age.
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Affiliation(s)
- Mohamed Belmouhand
- Department of OphthalmologyRigshospitalet, Copenhagen University HospitalGlostrupDenmark,Department of Clinical Medicine, Faculty of Healthy and Medical ScienceUniversity of CopenhagenCopenhagenDenmark
| | - Simon Paul Rothenbuehler
- Department of OphthalmologyRigshospitalet, Copenhagen University HospitalGlostrupDenmark,Department of OphthalmologyUniversity Hospital BaselBaselSwitzerland
| | - Jacob B. Hjelmborg
- Epidemiology, Biostatistics and Biodemography, Department of Public HealthUniversity of Southern DenmarkOdenseDenmark,The Danish Twin Research CenterUniversity of Southern DenmarkOdenseDenmark
| | - Sami Dabbah
- Department of OphthalmologyRigshospitalet, Copenhagen University HospitalGlostrupDenmark,Department of OphthalmologyOdense University HospitalOdenseDenmark
| | - Jakob Bjerager
- Department of OphthalmologyRigshospitalet, Copenhagen University HospitalGlostrupDenmark
| | - Birgit Agnes Sander
- Department of OphthalmologyRigshospitalet, Copenhagen University HospitalGlostrupDenmark
| | - Christine Dalgård
- The Danish Twin Research CenterUniversity of Southern DenmarkOdenseDenmark,Department of Public Health, Clinical Pharmacology, Pharmacy and Environmental MedicineUniversity of Southern DenmarkOdenseDenmark
| | - Michael Larsen
- Department of OphthalmologyRigshospitalet, Copenhagen University HospitalGlostrupDenmark,Department of Clinical Medicine, Faculty of Healthy and Medical ScienceUniversity of CopenhagenCopenhagenDenmark
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Janssen JAMJL. Hyperinsulinemia and Its Pivotal Role in Aging, Obesity, Type 2 Diabetes, Cardiovascular Disease and Cancer. Int J Mol Sci 2021; 22:ijms22157797. [PMID: 34360563 PMCID: PMC8345990 DOI: 10.3390/ijms22157797] [Citation(s) in RCA: 73] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/11/2021] [Accepted: 07/13/2021] [Indexed: 01/10/2023] Open
Abstract
For many years, the dogma has been that insulin resistance precedes the development of hyperinsulinemia. However, recent data suggest a reverse order and place hyperinsulinemia mechanistically upstream of insulin resistance. Genetic background, consumption of the “modern” Western diet and over-nutrition may increase insulin secretion, decrease insulin pulses and/or reduce hepatic insulin clearance, thereby causing hyperinsulinemia. Hyperinsulinemia disturbs the balance of the insulin–GH–IGF axis and shifts the insulin : GH ratio towards insulin and away from GH. This insulin–GH shift promotes energy storage and lipid synthesis and hinders lipid breakdown, resulting in obesity due to higher fat accumulation and lower energy expenditure. Hyperinsulinemia is an important etiological factor in the development of metabolic syndrome, type 2 diabetes, cardiovascular disease, cancer and premature mortality. It has been further hypothesized that nutritionally driven insulin exposure controls the rate of mammalian aging. Interventions that normalize/reduce plasma insulin concentrations might play a key role in the prevention and treatment of age-related decline, obesity, type 2 diabetes, cardiovascular disease and cancer. Caloric restriction, increasing hepatic insulin clearance and maximizing insulin sensitivity are at present the three main strategies available for managing hyperinsulinemia. This may slow down age-related physiological decline and prevent age-related diseases. Drugs that reduce insulin (hyper) secretion, normalize pulsatile insulin secretion and/or increase hepatic insulin clearance may also have the potential to prevent or delay the progression of hyperinsulinemia-mediated diseases. Future research should focus on new strategies to minimize hyperinsulinemia at an early stage, aiming at successfully preventing and treating hyperinsulinemia-mediated diseases.
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Affiliation(s)
- Joseph A M J L Janssen
- Department of internal Medicine, Division of Endocrinology, Erasmus Medical Center, 40, 3015 GD Rotterdam, The Netherlands
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6
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Disentangling the relationship between bone turnover and glucose homeostasis: A prospective, population-based twin study. Bone Rep 2021; 14:100752. [PMID: 33665235 PMCID: PMC7900018 DOI: 10.1016/j.bonr.2021.100752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 02/02/2021] [Indexed: 11/23/2022] Open
Abstract
Background Biochemical markers of bone turnover are lower in patients with type 2 diabetes, which may be explained by genetic variants being associated with type 2 diabetes and bone turnover as well as environmental factors. We hypothesized that bone turnover markers associate with and predict changes in glucose homeostasis after control for genetics and shared environment. Methods 1071 healthy, non-diabetic (at baseline, 1997-2000) adult mono- and dizygotic twins participating in the prospective study GEMINAKAR were reassessed between 2010 and 2012 with clinical evaluation, biochemical tests and oral glucose tolerance test. Fasting bone turnover markers (CTX, P1NP and osteocalcin) were measured. The association between bone turnover, glucose homeostasis and the ability of bone turnover markers to predict changes in glucose homeostasis were assessed in cross-sectional and longitudinal analyses. Analyses were performed both at an individual level and adjusted for shared environmental and genetic factors. Results Glucose levels increased with age, and 33 (3%) participants had developed type 2 diabetes at follow-up. In women, bone turnover markers increased with age, whereas for men only osteocalcin increased with age. Bone turnover markers were not associated with fasting glucose, insulin, or HOMA-IR at baseline or follow-up before or after adjustment for age, sex, BMI, smoking, and use of medication at baseline. Variation in bone turnover markers was mainly explained by unique environmental factors, 70%, 70% and 55% for CTX, P1NP and osteocalcin, respectively, whereas additive genetic factors explained 7%, 13% and 45% of the variation in CTX, P1NP and osteocalcin. Conclusions Bone turnover markers were not associated with baseline plasma glucose levels and did not predict changes in glucose homeostasis. Variation in bone turnover markers is mainly explained by environmental factors, however, compared to CTX and P1NP, genetic factors have a larger impact on osteocalcin levels.
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Abstract
Diabetes mellitus is a major risk factor for coronary heart disease (CHD). The major form of diabetes mellitus is type 2 diabetes mellitus (T2D), which is thus largely responsible for the CHD association in the general population. Recent years have seen major advances in the genetics of T2D, principally through ever-increasing large-scale genome-wide association studies. This article addresses the question of whether this expanding knowledge of the genomics of T2D provides insight into the etiologic relationship between T2D and CHD. We will investigate this relationship by reviewing the evidence for shared genetic loci between T2D and CHD; by examining the formal testing of this interaction (Mendelian randomization studies assessing whether T2D is causal for CHD); and then turn to the implications of this genetic relationship for therapies for CHD, for therapies for T2D, and for therapies that affect both. In conclusion, the growing knowledge of the genetic relationship between T2D and CHD is beginning to provide the promise for improved prevention and treatment of both disorders.
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Affiliation(s)
- Mark O Goodarzi
- From the Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA (M.O.G.)
| | - Jerome I Rotter
- Institute for Translational Genomics and Population Sciences and Department of Pediatrics, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA (J.I.R.)
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Abstract
Type 2 diabetes, which is caused by both genetic and environmental factors, may be diagnosed using the oral glucose tolerance test (OGTT). Recent studies demonstrated specific patterns in glucose curves during OGTT associated with cardiometabolic risk profiles. As the relative contribution of genetic and environmental influences on glucose curve patterns is unknown, we aimed to investigate the heritability of these patterns. We studied twins from the Danish GEMINAKAR cohort aged 18-67 years and free from diabetes at baseline during 1997-2000; glucose concentrations were measured three times during a 2-h OGTT. Heterogeneity of the glucose response during OGTT was examined with latent class mixed-effects models, evaluating goodness of fit by Bayes information criterion. The genetic influence on curve patterns was estimated using quantitative genetic modeling based on linear structural equations. Overall, 1455 twins (41% monozygotic) had valid glucose concentrations measured from the OGTT, and four latent classes with different glucose response patterns were identified. Statistical modeling demonstrated genetic influence for belonging to a specific class or not, with heritability estimated to be between 45% and 67%. During ∼12 years of follow-up, the four classes were each associated with different incidence of type 2 diabetes. Hence, glucose response curve patterns associated with type 2 diabetes risk appear to be moderately to highly heritable.
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Morselli LL, Gamazon ER, Tasali E, Cox NJ, Van Cauter E, Davis LK. Shared Genetic Control of Brain Activity During Sleep and Insulin Secretion: A Laboratory-Based Family Study. Diabetes 2018; 67:155-164. [PMID: 29084784 PMCID: PMC5741150 DOI: 10.2337/db16-1229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Accepted: 10/24/2017] [Indexed: 11/13/2022]
Abstract
Over the past 20 years, a large body of experimental and epidemiologic evidence has linked sleep duration and quality to glucose homeostasis, although the mechanistic pathways remain unclear. The aim of the current study was to determine whether genetic variation influencing both sleep and glucose regulation could underlie their functional relationship. We hypothesized that the genetic regulation of electroencephalographic (EEG) activity during non-rapid eye movement sleep, a highly heritable trait with fingerprint reproducibility, is correlated with the genetic control of metabolic traits including insulin sensitivity and β-cell function. We tested our hypotheses through univariate and bivariate heritability analyses in a three-generation pedigree with in-depth phenotyping of both sleep EEG and metabolic traits in 48 family members. Our analyses accounted for age, sex, adiposity, and the use of psychoactive medications. In univariate analyses, we found significant heritability for measures of fasting insulin sensitivity and β-cell function, for time spent in slow-wave sleep, and for EEG spectral power in the delta, theta, and sigma ranges. Bivariate heritability analyses provided the first evidence for a shared genetic control of brain activity during deep sleep and fasting insulin secretion rate.
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Affiliation(s)
- Lisa L Morselli
- Sleep, Metabolism and Health Center, Department of Medicine, The University of Chicago, Chicago, IL
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA
| | - Eric R Gamazon
- Division of Genetic Medicine, Department of Medicine, Vanderbilt University, Nashville, TN
- Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN
| | - Esra Tasali
- Sleep, Metabolism and Health Center, Department of Medicine, The University of Chicago, Chicago, IL
- Section of Pulmonary and Critical Care Medicine, Department of Medicine, The University of Chicago, Chicago, IL
| | - Nancy J Cox
- Division of Genetic Medicine, Department of Medicine, Vanderbilt University, Nashville, TN
- Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN
| | - Eve Van Cauter
- Sleep, Metabolism and Health Center, Department of Medicine, The University of Chicago, Chicago, IL
| | - Lea K Davis
- Division of Genetic Medicine, Department of Medicine, Vanderbilt University, Nashville, TN
- Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN
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Bien SA, Pankow JS, Haessler J, Lu Y, Pankratz N, Rohde RR, Tamuno A, Carlson CS, Schumacher FR, Bůžková P, Daviglus ML, Lim U, Fornage M, Fernandez-Rhodes L, Avilés-Santa L, Buyske S, Gross MD, Graff M, Isasi CR, Kuller LH, Manson JE, Matise TC, Prentice RL, Wilkens LR, Yoneyama S, Loos RJF, Hindorff LA, Le Marchand L, North KE, Haiman CA, Peters U, Kooperberg C. Transethnic insight into the genetics of glycaemic traits: fine-mapping results from the Population Architecture using Genomics and Epidemiology (PAGE) consortium. Diabetologia 2017; 60:2384-2398. [PMID: 28905132 PMCID: PMC5918310 DOI: 10.1007/s00125-017-4405-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 07/06/2017] [Indexed: 12/13/2022]
Abstract
AIMS/HYPOTHESIS Elevated levels of fasting glucose and fasting insulin in non-diabetic individuals are markers of dysregulation of glucose metabolism and are strong risk factors for type 2 diabetes. Genome-wide association studies have discovered over 50 SNPs associated with these traits. Most of these loci were discovered in European populations and have not been tested in a well-powered multi-ethnic study. We hypothesised that a large, ancestrally diverse, fine-mapping genetic study of glycaemic traits would identify novel and population-specific associations that were previously undetectable by European-centric studies. METHODS A multiethnic study of up to 26,760 unrelated individuals without diabetes, of predominantly Hispanic/Latino and African ancestries, were genotyped using the Metabochip. Transethnic meta-analysis of racial/ethnic-specific linear regression analyses were performed for fasting glucose and fasting insulin. We attempted to replicate 39 fasting glucose and 17 fasting insulin loci. Genetic fine-mapping was performed through sequential conditional analyses in 15 regions that included both the initially reported SNP association(s) and denser coverage of SNP markers. In addition, Metabochip-wide analyses were performed to discover novel fasting glucose and fasting insulin loci. The most significant SNP associations were further examined using bioinformatic functional annotation. RESULTS Previously reported SNP associations were significantly replicated (p ≤ 0.05) in 31/39 fasting glucose loci and 14/17 fasting insulin loci. Eleven glycaemic trait loci were refined to a smaller list of potentially causal variants through transethnic meta-analysis. Stepwise conditional analysis identified two loci with independent secondary signals (G6PC2-rs477224 and GCK-rs2908290), which had not previously been reported. Population-specific conditional analyses identified an independent signal in G6PC2 tagged by the rare variant rs77719485 in African ancestry. Further Metabochip-wide analysis uncovered one novel fasting insulin locus at SLC17A2-rs75862513. CONCLUSIONS/INTERPRETATION These findings suggest that while glycaemic trait loci often have generalisable effects across the studied populations, transethnic genetic studies help to prioritise likely functional SNPs, identify novel associations that may be population-specific and in turn have the potential to influence screening efforts or therapeutic discoveries. DATA AVAILABILITY The summary statistics from each of the ancestry-specific and transethnic (combined ancestry) results can be found under the PAGE study on dbGaP here: https://www.ncbi.nlm.nih.gov/projects/gap/cgi-bin/study.cgi?study_id=phs000356.v1.p1.
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Affiliation(s)
- Stephanie A Bien
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave N., Seattle, WA, 98109-1024, USA.
| | - James S Pankow
- Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN, USA
| | - Jeffrey Haessler
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave N., Seattle, WA, 98109-1024, USA
| | - Yinchang Lu
- Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA
| | - Nathan Pankratz
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, USA
| | - Rebecca R Rohde
- Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Alfred Tamuno
- The Department of Preventive Medicine, The Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Christopher S Carlson
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave N., Seattle, WA, 98109-1024, USA
| | - Fredrick R Schumacher
- Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, OH, USA
| | - Petra Bůžková
- Department of Biostatistics, University of Washington, Seattle, WA, USA
| | - Martha L Daviglus
- Department of Medicine, Institute for Minority Health Research, University of Illinois at Chicago, Chicago, IL, USA
| | - Unhee Lim
- Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI, USA
| | - Myriam Fornage
- Human Genetics Center, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Lindsay Fernandez-Rhodes
- Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Larissa Avilés-Santa
- Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Steven Buyske
- Department of Genetics, Rutgers University, Piscataway, NJ, USA
- Department of Statistics, Rutgers University, Newark, NJ, USA
| | - Myron D Gross
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, USA
| | - Mariaelisa Graff
- Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Carmen R Isasi
- Department of Epidemiology & Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Lewis H Kuller
- Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA, USA
| | - JoAnn E Manson
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Tara C Matise
- Department of Genetics, Rutgers University, Piscataway, NJ, USA
| | - Ross L Prentice
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave N., Seattle, WA, 98109-1024, USA
| | - Lynne R Wilkens
- Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI, USA
| | - Sachiko Yoneyama
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI, USA
- Department of Epidemiology, University of Michigan, Ann Arbor, MI, USA
| | - Ruth J F Loos
- The Department of Preventive Medicine, The Icahn School of Medicine at Mount Sinai, New York, NY, USA
- MRC Epidemiology Unit, Institute of Metabolic Science, University of Cambridge, Cambridge, UK
- The Charles Bronfman Institute for Personalized Medicine, The Icahn School of Medicine at Mount Sinai, New York, NY, USA
- The Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lucia A Hindorff
- National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Loic Le Marchand
- Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI, USA
| | - Kari E North
- Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Carolina Center for Genome Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Christopher A Haiman
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California/Norris Comprehensive Cancer Center, Los Angeles, CA, USA
| | - Ulrike Peters
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave N., Seattle, WA, 98109-1024, USA
| | - Charles Kooperberg
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave N., Seattle, WA, 98109-1024, USA
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11
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Li S, Kyvik KO, Duan H, Zhang D, Pang Z, Hjelmborg J, Tan Q, Kruse T, Dalgård C. Longitudinal Investigation into Genetics in the Conservation of Metabolic Phenotypes in Danish and Chinese Twins. PLoS One 2016; 11:e0162805. [PMID: 27618179 PMCID: PMC5019416 DOI: 10.1371/journal.pone.0162805] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 08/29/2016] [Indexed: 12/02/2022] Open
Abstract
Longitudinal twin studies on long term conservation of individual metabolic phenotypes can help to explore the genetic and environmental basis in maintaining metabolic homeostasis and metabolic health. We performed a longitudinal twin study on 12 metabolic phenotypes from Danish twins followed up for 12 years and Chinese twins traced for 7 years. The study covered a relatively large sample of 502 pairs of Danish adult twins with a mean age at intake of 38 years and a total of 181 Chinese adult twin pairs with a mean baseline age of 39.5 years. Bivariate twin models were fitted to the longitudinal measurements taken at two time points (at baseline and follow-up) to estimate the genetic and environmental contributions to phenotype variation and correlation at and between the two time points. High genetic components in the regulation of intra-individual phenotype correlation or stability over time were estimated in both Danish (h2>0.75 except fasting blood glucose) and Chinese (h2>0.72 except blood pressure) twins; moderate to high genetic contribution to phenotype variation at the two time points were also estimated except for the low genetic regulation on glucose in Danish and on blood pressure in Chinese twins. Meanwhile the bivariate twin models estimated shared environmental contributions to the variance and covariance in fasting blood glucose in Danish twins, and in systolic and diastolic blood pressure, low and high density lipoprotein cholesterol in Chinese twins. Overall, our longitudinal twin study on long-term stability of metabolic phenotypes in Danish and Chinese twins identified a common pattern of high genetic control over phenotype conservation, and at the same time revealed population-specific patterns of genetic and common environmental regulation on the variance as well as covariance of glucose and blood pressure.
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Affiliation(s)
- Shuxia Li
- Unit of Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- * E-mail:
| | - Kirsten Ohm Kyvik
- Department of Clinical Research, University of Southern Denmark, and Odense Patient data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Haiping Duan
- Qingdao Center for Disease Control and Prevention, Qingdao, China
| | - Dongfeng Zhang
- Department of Public Health, Qingdao University Medical College, Qingdao, China
| | - Zengchang Pang
- Qingdao Center for Disease Control and Prevention, Qingdao, China
| | - Jacob Hjelmborg
- Epidemiology, Biostatistics and Biodemography, Department of Public Health, University of Southern Denmark, Odense, Denmark
| | - Qihua Tan
- Unit of Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- Epidemiology, Biostatistics and Biodemography, Department of Public Health, University of Southern Denmark, Odense, Denmark
| | - Torben Kruse
- Unit of Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Christine Dalgård
- Environmental Medicine, Department of Public Health, University of Southern Denmark, Odense, Denmark
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12
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Risk Alleles in/near ADCY5, ADRA2A, CDKAL1, CDKN2A/B, GRB10, and TCF7L2 Elevate Plasma Glucose Levels at Birth and in Early Childhood: Results from the FAMILY Study. PLoS One 2016; 11:e0152107. [PMID: 27049325 PMCID: PMC4822946 DOI: 10.1371/journal.pone.0152107] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 02/20/2016] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Metabolic abnormalities that lead to type 2 diabetes mellitus begin in early childhood. OBJECTIVES We investigate whether common genetic variants identified in adults have an effect on glucose in early life. METHODS 610 newborns, 463 mothers, and 366 fathers were included in the present study. Plasma glucose and anthropometric characteristics were collected at birth, 3, and 5 years. After quality assessment, 37 SNPs, which have demonstrated an association with fasting plasma glucose at the genome-wide threshold in adults, were studied. Quantitative trait disequilibrium tests and mixed-effects regressions were conducted to estimate an effect of the SNPs on glucose. RESULTS Risk alleles for 6 loci increased glucose levels from birth to 5 years of age (ADCY5, ADRA2A, CDKAL1, CDKN2A/B, GRB10, and TCF7L2, 4.85x10-3 ≤ P ≤ 4.60x10-2). Together, these 6 SNPs increase glucose by 0.05 mmol/L for each risk allele in a genotype score (P = 6.33x10-5). None of the associations described in the present study have been reported previously in early childhood. CONCLUSION Our data support the notion that a subset of loci contributing to plasma glucose variation in adults has an effect at birth and in early life.
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13
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Kriebel J, Herder C, Rathmann W, Wahl S, Kunze S, Molnos S, Volkova N, Schramm K, Carstensen-Kirberg M, Waldenberger M, Gieger C, Peters A, Illig T, Prokisch H, Roden M, Grallert H. Association between DNA Methylation in Whole Blood and Measures of Glucose Metabolism: KORA F4 Study. PLoS One 2016; 11:e0152314. [PMID: 27019061 PMCID: PMC4809492 DOI: 10.1371/journal.pone.0152314] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 03/11/2016] [Indexed: 12/22/2022] Open
Abstract
Epigenetic regulation has been postulated to affect glucose metabolism, insulin sensitivity and the risk of type 2 diabetes. Therefore, we performed an epigenome-wide association study for measures of glucose metabolism in whole blood samples of the population-based Cooperative Health Research in the Region of Augsburg F4 study using the Illumina HumanMethylation 450 BeadChip. We identified a total of 31 CpG sites where methylation level was associated with measures of glucose metabolism after adjustment for age, sex, smoking, and estimated white blood cell proportions and correction for multiple testing using the Benjamini-Hochberg (B-H) method (four for fasting glucose, seven for fasting insulin, 25 for homeostasis model assessment-insulin resistance [HOMA-IR]; B-H-adjusted p-values between 9.2x10(-5) and 0.047). In addition, DNA methylation at cg06500161 (annotated to ABCG1) was associated with all the aforementioned phenotypes and 2-hour glucose (B-H-adjusted p-values between 9.2x10(-5) and 3.0x10(-3)). Methylation status of additional three CpG sites showed an association with fasting insulin only after additional adjustment for body mass index (BMI) (B-H-adjusted p-values = 0.047). Overall, effect strengths were reduced by around 30% after additional adjustment for BMI, suggesting that this variable has an influence on the investigated phenotypes. Furthermore, we found significant associations between methylation status of 21 of the aforementioned CpG sites and 2-hour insulin in a subset of samples with seven significant associations persisting after additional adjustment for BMI. In a subset of 533 participants, methylation of the CpG site cg06500161 (ABCG1) was inversely associated with ABCG1 gene expression (B-H-adjusted p-value = 1.5x10(-9)). Additionally, we observed an enrichment of the top 1,000 CpG sites for diabetes-related canonical pathways using Ingenuity Pathway Analysis. In conclusion, our study indicates that DNA methylation and diabetes-related traits are associated and that these associations are partially BMI-dependent. Furthermore, the interaction of ABCG1 with glucose metabolism is modulated by epigenetic processes.
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Affiliation(s)
- Jennifer Kriebel
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
| | - Christian Herder
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Wolfgang Rathmann
- Institute for Biometrics and Epidemiology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Simone Wahl
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
| | - Sonja Kunze
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
| | - Sophie Molnos
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
| | - Nadezda Volkova
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
| | - Katharina Schramm
- Institute of Human Genetics, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Human Genetics, Technische Universitaet Muenchen, Munich, Germany
| | - Maren Carstensen-Kirberg
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Melanie Waldenberger
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
| | - Christian Gieger
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
| | - Annette Peters
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
| | - Thomas Illig
- Hannover Unified Biobank, Hannover Medical School, Hanover, Germany
- Institute of Human Genetics, Hannover Medical School, Hanover, Germany
| | - Holger Prokisch
- Institute of Human Genetics, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Human Genetics, Technische Universitaet Muenchen, Munich, Germany
| | - Michael Roden
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University Duesseldorf, Duesseldorf, Germany
- Department of Endocrinology and Diabetology, University Hospital Duesseldorf, Duesseldorf, Germany
| | - Harald Grallert
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- Institute of Epidemiology II, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Muenchen-Neuherberg, Germany
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14
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Li S, Kyvik KO, Pang Z, Zhang D, Duan H, Tan Q, Hjelmborg J, Kruse T, Dalgård C. Genetic and Environmental Regulation on Longitudinal Change of Metabolic Phenotypes in Danish and Chinese Adult Twins. PLoS One 2016; 11:e0148396. [PMID: 26862898 PMCID: PMC4749287 DOI: 10.1371/journal.pone.0148396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 01/18/2016] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE The rate of change in metabolic phenotypes can be highly indicative of metabolic disorders and disorder-related modifications. We analyzed data from longitudinal twin studies on multiple metabolic phenotypes in Danish and Chinese twins representing two populations of distinct ethnic, cultural, social-economic backgrounds and geographical environments. MATERIALS AND METHODS The study covered a relatively large sample of 502 pairs of Danish adult twins followed up for a long period of 12 years with a mean age at intake of 38 years (range: 18-65) and a total of 181 Chinese adult twin pairs traced for about 7 years with a mean baseline age of 39.5 years (range: 23-64). The classical twin models were fitted to the longitudinal change in each phenotype (Δphenotype) to estimate the genetic and environmental contributions to the variation in Δphenotype. RESULTS Moderate to high contributions by the unique environment were estimated for all phenotypes in both Danish (from 0.51 for low density lipoprotein cholesterol up to 0.72 for triglycerides) and Chinese (from 0.41 for triglycerides up to 0.73 for diastolic blood pressure) twins; low to moderate genetic components were estimated for long-term change in most of the phenotypes in Danish twins except for triglycerides and hip circumference. Compared with Danish twins, the Chinese twins tended to have higher genetic control over the longitudinal changes in lipids (except high density lipoprotein cholesterol) and glucose, higher unique environmental contribution to blood pressure but no genetic contribution to longitudinal change in body mass traits. CONCLUSION Our results emphasize the major contribution of unique environment to the observed intra-individual variation in all metabolic phenotypes in both samples, and meanwhile reveal differential patterns of genetic and common environmental regulation on changes over time in metabolic phenotypes across the two samples.
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Affiliation(s)
- Shuxia Li
- Unit of Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- * E-mail:
| | - Kirsten Ohm Kyvik
- Department of Clinical Research, University of Southern Denmark, and Odense Patient data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Zengchang Pang
- Qingdao Center for Disease Control and Prevention, Qingdao, China
| | - Dongfeng Zhang
- Department of Public Health, Qingdao University Medical College, Qingdao, China
| | - Haiping Duan
- Qingdao Center for Disease Control and Prevention, Qingdao, China
| | - Qihua Tan
- Unit of Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- Epidemiology, Biostatistics and Biodemography, Department of Public Health, University of Southern Denmark, Odense, Denmark
| | - Jacob Hjelmborg
- Epidemiology, Biostatistics and Biodemography, Department of Public Health, University of Southern Denmark, Odense, Denmark
| | - Torben Kruse
- Unit of Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Christine Dalgård
- Environmental Medicine, Department of Public Health, University of Southern Denmark, Odense, Denmark
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15
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Dalgård C, Benetos A, Verhulst S, Labat C, Kark JD, Christensen K, Kimura M, Kyvik KO, Aviv A. Leukocyte telomere length dynamics in women and men: menopause vs age effects. Int J Epidemiol 2015; 44:1688-95. [PMID: 26385867 PMCID: PMC4681111 DOI: 10.1093/ije/dyv165] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/16/2015] [Indexed: 01/09/2023] Open
Abstract
Background: A longer leukocyte telomere length (LTL) in women than men has been attributed to a slow rate of LTL attrition in women, perhaps due to high estrogen exposure during the premenopausal period. Methods: To test this premise we performed a longitudinal study (an average follow-up of 12 years) in a subset of the population-based Danish National Twin Registry. Participants consisted of 405 women, aged 37.5 (range 18.0–64.3) years, and 329 men, aged 38.8 (range 18.0–58.5) years, at baseline examination. Results: Women showed a longer LTL [kb ± standard error(SE)] than men (baseline: 7.01 ± 0.03 vs 6.87 ± 0.04; follow-up: 6.79 ± 0.03 vs 6.65 ± 0.03; both P = 0.005). Women displayed deceleration of LTL attrition (bp/years ± SE), as they transitioned from the premenopausal period (20.6 ± 1.0) through the perimenopausal period (16.5 ± 1.3) to the postmenopausal period (15.1 ± 1.7). Age was not associated with LTL attrition in women after statistical control for menopausal status. Men, in contrast, displayed a trend for age-dependent increase in the rate of LTL attrition, which differed significantly from the pattern in women (P for interaction = 0.01). Conclusions: Results indicate that the premenopausal period is expressed in a higher rate of LTL attrition than the postmenopausal period. They further suggest that the sex gap in LTL stems from earlier ages—the period of growth and development. The higher rate of LTL attrition in premenopausal women, we propose, might relate to estrogen-mediated increased turnover of erythrocytes, menstrual bleeding or both.
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Affiliation(s)
- Christine Dalgård
- Department of Public Health - Environmental Medicine, University of Southern Denmark, Odense, Denmark
| | - Athanase Benetos
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy F54000, Nancy, France, Université de Lorraine, Nancy, France
| | - Simon Verhulst
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Carlos Labat
- INSERM, U1116, Vandoeuvre-les-Nancy F54000, Nancy, France, Université de Lorraine, Nancy, France
| | - Jeremy D Kark
- Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel
| | - Kaare Christensen
- Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics, Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark
| | - Masayuki Kimura
- Center of Human Development and Aging, Rutgers, State University of New Jersey, Newark, NJ, USA and
| | - Kirsten Ohm Kyvik
- Institute of Regional Health Services Research, University of Southern Denmark, and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Abraham Aviv
- Center of Human Development and Aging, Rutgers, State University of New Jersey, Newark, NJ, USA and
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16
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Hjelmborg JB, Dalgård C, Möller S, Steenstrup T, Kimura M, Christensen K, Kyvik KO, Aviv A. The heritability of leucocyte telomere length dynamics. J Med Genet 2015; 52:297-302. [PMID: 25770094 PMCID: PMC4413805 DOI: 10.1136/jmedgenet-2014-102736] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 10/14/2014] [Indexed: 01/17/2023]
Abstract
Background Leucocyte telomere length (LTL) is a complex trait associated with ageing and longevity. LTL dynamics are defined by LTL and its age-dependent attrition. Strong, but indirect evidence suggests that LTL at birth and its attrition during childhood largely explains interindividual LTL variation among adults. A number of studies have estimated the heritability of LTL, but none has assessed the heritability of age-dependent LTL attrition. Methods We examined the heritability of LTL dynamics based on a longitudinal evaluation (an average follow-up of 12 years) in 355 monozygotic and 297 dizygotic same-sex twins (aged 19–64 years at baseline). Results Heritability of LTL at baseline was estimated at 64% (95% CI 39% to 83%) with 22% (95% CI 6% to 49%) of shared environmental effects. Heritability of age-dependent LTL attrition rate was estimated at 28% (95% CI 16% to 44%). Individually unique environmental factors, estimated at 72% (95% CI 56% to 84%) affected LTL attrition rate with no indication of shared environmental effects. Conclusions This is the first study that estimated heritability of LTL and also its age-dependent attrition. As LTL attrition is much slower in adults than in children and given that having a long or a short LTL is largely determined before adulthood, our findings suggest that heritability and early life environment are the main determinants of LTL throughout the human life course. Thus, insights into factors that influence LTL at birth and its dynamics during childhood are crucial for understanding the role of telomere genetics in human ageing and longevity.
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Affiliation(s)
- Jacob B Hjelmborg
- Department of Epidemiology, Biostatistics and Biodemography, Institute of Public Health, University of Southern Denmark, Odense, Denmark The Danish Twin Registry, University of Southern Denmark, Odense, Denmark
| | - Christine Dalgård
- Department of Environmental Medicine, Institute of Public Health, University of Southern Denmark, Odense, Denmark
| | - Soren Möller
- Department of Epidemiology, Biostatistics and Biodemography, Institute of Public Health, University of Southern Denmark, Odense, Denmark The Danish Twin Registry, University of Southern Denmark, Odense, Denmark
| | - Troels Steenstrup
- Department of Epidemiology, Biostatistics and Biodemography, Institute of Public Health, University of Southern Denmark, Odense, Denmark The Danish Twin Registry, University of Southern Denmark, Odense, Denmark
| | - Masayuki Kimura
- Center of Human Development and Aging, Rutgers, The State University of New Jersey, New Jersey Medical School, Newark, New Jersey, USA
| | - Kaare Christensen
- Department of Epidemiology, Biostatistics and Biodemography, Institute of Public Health, University of Southern Denmark, Odense, Denmark The Danish Twin Registry, University of Southern Denmark, Odense, Denmark Department of Clinical Genetics, Odense University Hospital, Odense, Denmark Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark
| | - Kirsten O Kyvik
- Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Abraham Aviv
- Center of Human Development and Aging, Rutgers, The State University of New Jersey, New Jersey Medical School, Newark, New Jersey, USA
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17
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Munk HL, Svendsen AJ, Hjelmborg JVB, Sorensen GL, Kyvik KO, Junker P. Heritability assessment of cartilage metabolism. A twin study on circulating procollagen IIA N-terminal propeptide (PIIANP). Osteoarthritis Cartilage 2014; 22:1142-7. [PMID: 25008205 DOI: 10.1016/j.joca.2014.06.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 06/05/2014] [Accepted: 06/28/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The aim of this investigation was to estimate the heritability of circulating collagen IIA N-terminal propeptide (PIIANP) by studying mono- and dizygotic healthy twin pairs at different age and both genders. DESIGN 598 monozygotic (MZ) and dizygotic (DZ) twin individuals aged 18-59 years were recruited from the Danish Twin Registry. PIIANP was measured by competitive ELISA. The similarity of circulating PIIANP among MZ and DZ twins was assessed by intraclass correlations according to traits. The heritability was estimated by variance component analysis accounting for additive and dominant genetic factors as well as shared and non-shared environment but ignoring epistasis (genetic inter-locus interaction) and gene-environment interaction. RESULTS The intraclass correlation of PIIANP in MZ and DZ twins was 0.69 (0.60-0.76) and 0.46 (0.34-0.58) respectively indicating a significant genetic impact on PIIANP in serum. Additive genetic effects explained 45% (21-70%), shared environment 24% (7-53%) and non-shared environment 31% (24-39%) of the total variance. The heritability estimate did not differ across ages and between genders. CONCLUSIONS The study shows that approximately 45% of the collagen IIA synthesis as assessed by the collagen IIA N-terminal propeptide in serum is attributable to genetic effectors while individual and shared environment account for 24% and 31% respectively. The heritability does not differ between genders or according to age.
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Affiliation(s)
- H L Munk
- Department of Rheumatology C, Odense University Hospital, Denmark; University of Southern Denmark, Denmark.
| | - A J Svendsen
- The Danish Twin Registry, Epidemiology, Institute of Public Health, Denmark; University of Southern Denmark, Denmark.
| | - J v B Hjelmborg
- Epidemiology and Statistics, Institute of Public Health, Denmark; University of Southern Denmark, Denmark.
| | - G L Sorensen
- Institute for molecular Medicine, Denmark; University of Southern Denmark, Denmark.
| | - K O Kyvik
- Institute of Regional Health Services Research, Denmark; University of Southern Denmark, Denmark.
| | - P Junker
- Department of Rheumatology C, Odense University Hospital, Denmark; University of Southern Denmark, Denmark.
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18
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Benetos A, Dalgård C, Labat C, Kark JD, Verhulst S, Christensen K, Kimura M, Horvath K, Kyvik KO, Aviv A. Sex difference in leukocyte telomere length is ablated in opposite-sex co-twins. Int J Epidemiol 2014; 43:1799-805. [PMID: 25056338 PMCID: PMC4276058 DOI: 10.1093/ije/dyu146] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background: In eutherian mammals and in humans, the female fetus may be masculinized while sharing the intra-uterine environment with a male fetus. Telomere length (TL), as expressed in leukocytes, is heritable and is longer in women than in men. The main determinant of leukocyte TL (LTL) is LTL at birth. However, LTL is modified by age-dependent attrition. Methods: We studied LTL dynamics (LTL and its attrition) in adult same-sex (monozygotic, n = 268; dizygotic, n = 308) twins and opposite-sex (n = 144) twins. LTL was measured by Southern blots of the terminal restriction fragments. Results: We observed that in same-sex (both monozygotic and dizygotic) twins, as reported in singletons, LTL was longer in females than in males [estimate ± standard error (SE):163 ± 63 bp, P < 0.01]. However, in opposite-sex twins, female LTL was indistinguishable from that of males (−31 ± 52 bp, P = 0.6), whereas male LTL was not affected. Findings were similar when the comparison was restricted to opposite-sex and same-sex dizygotic twins (females relative to males: same-sex: 188 ± 90 bp, P < 0.05; other-sex: −32 ± 64 bp, P = 0.6). Conclusions: These findings are compatible with masculinization of the female fetus in opposite-sex twins. They suggest that the sex difference in LTL, seen in the general population, is largely determined in utero, perhaps by the intrauterine hormonal environment. Further studies in newborn twins are warranted to test this thesis.
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Affiliation(s)
- Athanase Benetos
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, Universi
| | - Christine Dalgård
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Carlos Labat
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Jeremy D Kark
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Simon Verhulst
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Kaare Christensen
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, Universi
| | - Masayuki Kimura
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Kent Horvath
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Kirsten Ohm Kyvik
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Abraham Aviv
- Département de Médecine Gériatrique, CHU de Nancy, Nancy, France, INSERM, U1116, Vandoeuvre-les-Nancy, France, Université de Lorraine, Nancy, France, Department of Environmental Medicine, University of Southern Denmark, Odense, Denmark, Hebrew University-Hadassah School of Public Health and Community Medicine, Jerusalem, Israel, Centre for Behaviour and Neurosciences, University of Groningen, Groningen, The Netherlands, Danish Twin Registry, University of Southern Denmark, Odense, Denmark, Department of Clinical Genetics and Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark, Center of Human Development and Aging, State University of New Jersey, Newark, NJ, USA and Institute of Regional Health Services Research, University of Southern Denmark and Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
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Mengel-From J, Thinggaard M, Dalgård C, Kyvik KO, Christensen K, Christiansen L. Mitochondrial DNA copy number in peripheral blood cells declines with age and is associated with general health among elderly. Hum Genet 2014; 133:1149-59. [PMID: 24902542 DOI: 10.1007/s00439-014-1458-9] [Citation(s) in RCA: 244] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2013] [Accepted: 05/22/2014] [Indexed: 12/21/2022]
Abstract
The role of the mitochondria in disease, general health and aging has drawn much attention over the years. Several attempts have been made to describe how the numbers of mitochondria correlate with age, although with inconclusive results. In this study, the relative quantity of mitochondrial DNA compared to nuclear DNA, i.e. the mitochondrial DNA copy number, was measured by PCR technology and used as a proxy for the content of mitochondria copies. In 1,067 Danish twins and singletons (18-93 years of age), with the majority being elderly individuals, the estimated mean mitochondrial DNA copy number in peripheral blood cells was similar for those 18-48 years of age [mean relative mtDNA content: 61.0; 95 % CI (52.1; 69.9)], but declined by -0.54 mtDNA 95 % CI (-0.63; -0.45) every year for those older than approximately 50 years of age. However, the longitudinal, yearly decline within an individual was more than twice as steep as observed in the cross-sectional analysis [decline of mtDNA content: -1.27; 95 % CI (-1.71; -0.82)]. Subjects with low mitochondrial DNA copy number had poorer outcomes in terms of cognitive performance, physical strength, self-rated health, and higher all-cause mortality than subjects with high mitochondrial DNA copy number, also when age was controlled for. The copy number mortality association can contribute to the smaller decline in a cross-sectional sample of the population compared to the individual, longitudinal decline. This study suggests that high mitochondrial DNA copy number in blood is associated with better health and survival among elderly.
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Affiliation(s)
- Jonas Mengel-From
- Epidemiology, Biostatistics and Biodemography Unit, The Danish Aging Research Center, The Danish Twin Registry, Institute of Public Health, University of Southern Denmark, J.B. Winsløws Vej 9, 5000, Odense, Denmark,
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20
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Goodarzi MO, Langefeld CD, Xiang AH, Chen YDI, Guo X, Hanley AJG, Raffel LJ, Kandeel F, Buchanan TA, Norris JM, Fingerlin TE, Lorenzo C, Rewers MJ, Haffner SM, Bowden DW, Rich SS, Bergman RN, Rotter JI, Watanabe RM, Wagenknecht LE. Insulin sensitivity and insulin clearance are heritable and have strong genetic correlation in Mexican Americans. Obesity (Silver Spring) 2014; 22:1157-64. [PMID: 24124113 PMCID: PMC3968231 DOI: 10.1002/oby.20639] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 08/29/2013] [Accepted: 10/02/2013] [Indexed: 11/08/2022]
Abstract
OBJECTIVE The GUARDIAN (Genetics UndeRlying DIAbetes in HispaNics) consortium is described, along with heritability estimates and genetic and environmental correlations of insulin sensitivity and metabolic clearance rate of insulin (MCRI). METHODS GUARDIAN is comprised of seven cohorts, consisting of 4,336 Mexican-American individuals in 1,346 pedigrees. Insulin sensitivity (SI ), MCRI, and acute insulin response (AIRg) were measured by frequently sampled intravenous glucose tolerance test in four cohorts. Insulin sensitivity (M, M/I) and MCRI were measured by hyperinsulinemic-euglycemic clamp in three cohorts. Heritability and genetic and environmental correlations were estimated within the family cohorts (totaling 3,925 individuals) using variance components. RESULTS Across studies, age, and gender-adjusted heritability of insulin sensitivity (SI , M, M/I) ranged from 0.23 to 0.48 and of MCRI from 0.35 to 0.73. The ranges for the genetic correlations were 0.91 to 0.93 between SI and MCRI; and -0.57 to -0.59 for AIRg and MCRI (all P < 0.0001). The ranges for the environmental correlations were 0.54 to 0.74 for SI and MCRI (all P < 0.0001); and -0.16 to -0.36 for AIRg and MCRI (P < 0.0001-0.06). CONCLUSIONS These data support a strong familial basis for insulin sensitivity and MCRI in Mexican Americans. The strong genetic correlations between MCRI and SI suggest common genetic determinants.
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Affiliation(s)
- Mark O. Goodarzi
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California
- the Medical Genetics Research Institute, Cedars-Sinai Medical Center, Los Angeles, California
| | - Carl D. Langefeld
- Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Anny H. Xiang
- Department of Research and Evaluation, Kaiser Permanente Southern California Medical Group, Pasadena, California
| | - Yii-Der I. Chen
- Institute for Translational Genomics and Population Sciences and Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, California
| | - Xiuqing Guo
- Institute for Translational Genomics and Population Sciences and Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, California
| | - Anthony J. G. Hanley
- Departments of Nutritional Sciences and Medicine and Dalla Lana School of Public Health, University of Toronto, Ontario, Canada
| | - Leslie J. Raffel
- the Medical Genetics Research Institute, Cedars-Sinai Medical Center, Los Angeles, California
| | - Fouad Kandeel
- Department of Diabetes, Endocrinology and Metabolism, City of Hope, Duarte, California
| | - Thomas A. Buchanan
- Department of Medicine, University of Southern California Keck School of Medicine, Los Angeles, California
- Department of Physiology and Biophysics, University of Southern California Keck School of Medicine, Los Angeles, California
| | - Jill M. Norris
- Department of Epidemiology, Colorado School of Public Health, University of Colorado Denver, Aurora, Colorado
| | - Tasha E. Fingerlin
- Department of Epidemiology, Colorado School of Public Health, University of Colorado Denver, Aurora, Colorado
- Department of Biostatistics and Informatics, Colorado School of Public Health, University of Colorado Denver, Aurora, Colorado
| | - Carlos Lorenzo
- Division of Clinical Epidemiology, University of Texas Health Sciences Center, San Antonio, Texas
| | - Marian J. Rewers
- Barbara Davis Center for Diabetes, University of Colorado School of Medicine, Aurora, Colorado
| | | | - Donald W. Bowden
- Department of Biochemistry, Centers for Diabetes Research and Genomics and Personalized Medicine Research, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Stephen S. Rich
- Center for Public Health Genomics, Department of Public Health Sciences, University of Virginia, Charlottesville, Virginia
| | - Richard N. Bergman
- Diabetes and Obesity Research Institute, Burns and Allen Research Institute, Cedars-Sinai Medical Center, Los Angeles, California
| | - Jerome I. Rotter
- Institute for Translational Genomics and Population Sciences and Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, California
| | - Richard M. Watanabe
- Department of Physiology and Biophysics, University of Southern California Keck School of Medicine, Los Angeles, California
- Department of Preventive Medicine, University of Southern California Keck School of Medicine, Los Angeles, California
| | - Lynne E. Wagenknecht
- Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
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21
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Lowe WL, Karban J. Genetics, genomics and metabolomics: new insights into maternal metabolism during pregnancy. Diabet Med 2014; 31:254-62. [PMID: 24528228 PMCID: PMC3927230 DOI: 10.1111/dme.12352] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 10/26/2013] [Indexed: 12/28/2022]
Abstract
Maternal glucose metabolism during pregnancy differs from the non-gravid state to allow the mother to meet her own and the growing fetus's energy needs. New insights into the mechanisms underlying maternal metabolism during pregnancy are being gained through the use of new 'omics' technologies. This review focuses on the application of genetics/genomics and metabolomics to the study of maternal metabolism during pregnancy. Following the identification of susceptibility genes for Type 2 diabetes through genome-wide association studies, association has been demonstrated of some Type 2 diabetes susceptibility genes with gestational diabetes mellitus, suggesting that the genetic architecture of Type 2 diabetes and gestational diabetes are, in part, similar. More recent genome-wide association studies examining maternal metabolism during pregnancy have demonstrated overlap of genes associated with metabolic traits in the gravid and non-gravid population, as well as genes that appear to be relatively unique to pregnancy. Metabolomics has also been used to profile the metabolic state of women during pregnancy through the multiplexed measurement of many low molecular weight metabolites. Measurement of amino acids and conventional metabolites have demonstrated changes in mothers with higher insulin resistance and glucose similar to changes in non-gravid, insulin-resistant populations, suggesting similarities in the metabolic profile characteristic of insulin resistance and hyperglycaemia in pregnant and non-pregnant populations. Metabolomics and genomics are but a few of the now available high-throughput 'omics' technologies. Future studies that integrate data from multiple technologies will allow an integrated systems biology approach to maternal metabolism during pregnancy.
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Affiliation(s)
- W L Lowe
- Center for Endocrinology, Metabolism and Molecular Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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22
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Matikainen N, Bogl LH, Hakkarainen A, Lundbom J, Lundbom N, Kaprio J, Rissanen A, Holst JJ, Pietiläinen KH. GLP-1 responses are heritable and blunted in acquired obesity with high liver fat and insulin resistance. Diabetes Care 2014; 37:242-51. [PMID: 23990519 DOI: 10.2337/dc13-1283] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Impaired incretin response represents an early and uniform defect in type 2 diabetes, but the contributions of genes and the environment are poorly characterized. RESEARCH DESIGN AND METHODS We studied 35 monozygotic (MZ) and 75 dizygotic (DZ) twin pairs (discordant and concordant for obesity) to determine the heritability of glucagon-like peptide 1 (GLP-1) responses to an oral glucose tolerance test (OGTT) and the influence of acquired obesity to GLP-1, glucose-dependent insulinotropic peptide (GIP), and peptide YY (PYY) during OGTT or meal test. RESULTS The heritability of GLP-1 area under the curve was 67% (95% CI 45-80). Cotwins from weight-concordant MZ and DZ pairs and weight-discordant MZ pairs but concordant for liver fat content demonstrated similar glucose, insulin, and incretin profiles after the OGTT and meal tests. In contrast, higher insulin responses and blunted 60-min GLP-1 responses during the OGTT were observed in the heavier as compared with leaner MZ cotwins discordant for BMI, liver fat, and insulin sensitivity. Blunted GLP-1 response to OGTT was observed in heavier as compared with leaner DZ cotwins discordant for obesity and insulin sensitivity. CONCLUSIONS Whereas the GLP-1 response to the OGTT is heritable, an acquired unhealthy pattern of obesity characterized by liver fat accumulation and insulin resistance is closely related to impaired GLP-1 response in young adults.
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Sækmose SG, Schlosser A, Holst R, Johansson SL, Wulf-Johansson H, Tornøe I, Vestbo J, Kyvik KO, Barington T, Holmskov U, Sørensen GL. Enzyme-linked immunosorbent assay characterization of basal variation and heritability of systemic microfibrillar-associated protein 4. PLoS One 2013; 8:e82383. [PMID: 24324779 PMCID: PMC3853316 DOI: 10.1371/journal.pone.0082383] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 10/25/2013] [Indexed: 11/23/2022] Open
Abstract
Background Microfibrillar-associated protein 4 (MFAP4) is a systemic biomarker that is significantly elevated in samples from patients suffering from hepatic cirrhosis. The protein is generally localized to elastic fibers and other connective tissue fibers in the extracellular matrix (ECM), and variation in systemic MFAP4 (sMFAP4) has the potential to reflect diverse diseases with increased ECM turnover. Here, we aimed to validate an enzyme-linked immunosorbent assay (ELISA) for the measurement of sMFAP4 with an emphasis on the robustness of the assay. Moreover, we aimed to determine confounders influencing the basal sMFAP4 variability and the genetic contribution to the basal variation. Methods The sandwich ELISA was based on two monoclonal anti-MFAP4 antibodies and was optimized and calibrated with a standard of recombinant MFAP4. The importance of pre-analytical sample handling was evaluated regarding sample tube type, time, and temperature conditions. The mean value structure and variance structure was determined in a twin cohort including 1,417 Danish twins (age 18-67 years) by mixed-effect linear regression modeling. Results The practical working range of the sandwich ELISA was estimated to be 4-75 U/ml. The maximum intra- and inter-assay variation was estimated to be 8.7% and 6.6%, respectively. Sample handling and processing appeared to influence MFAP4 measurements only marginally. The average concentration of sMFAP4 in the serum was 18.9 ± 8.4 (SD) U/ml in the twin cohort (95% CI: 18.5-19.4, median sMFAP4 17.3 U/ml). The mean structure model was demonstrated to include waist-hip ratio, age, and cigarette smoking status in interactions with gender. A relatively low heritability of h2 = 0.24 was found after applying a model including additive genetic factors and shared and non-shared environmental factors. Conclusions The described ELISA provides robust measures of the liver fibrosis marker sMFAP4. The low heritability and the relatively limited basal variation suggest that increased sMFAP4 reflects disease-induced processes.
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Affiliation(s)
- Susanne Gjørup Sækmose
- Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
- Department of Clinical Immunology, Region Sjaelland, Naestved Hospital, Naestved, Denmark
- Department of Clinical Immunology, Odense University Hospital, Odense, Denmark
| | - Anders Schlosser
- Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - René Holst
- Danish Twin Registry and Danish Aging Research Centre, Institute of Public Health, University of Southern Denmark, Odense, Denmark
| | - Sofie Lock Johansson
- Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Helle Wulf-Johansson
- Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Ida Tornøe
- Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Jørgen Vestbo
- Department of Respiratory Medicine, Odense University Hospital, Odense, Denmark
- Respiratory and Allergy Research Group, Manchester Academic Health Sciences Centre, University Hospital South Manchester NHD Foundation Trust, Manchester, United Kingdom
| | - Kirsten Ohm Kyvik
- Danish Twin Registry and Danish Aging Research Centre, Institute of Public Health, University of Southern Denmark, Odense, Denmark
- Odense Patient data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Torben Barington
- Department of Clinical Immunology, Odense University Hospital, Odense, Denmark
- Odense Patient data Explorative Network (OPEN), Odense University Hospital, Odense, Denmark
| | - Uffe Holmskov
- Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Grith Lykke Sørensen
- Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
- * E-mail:
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Schwenk RW, Vogel H, Schürmann A. Genetic and epigenetic control of metabolic health. Mol Metab 2013; 2:337-47. [PMID: 24327950 PMCID: PMC3854991 DOI: 10.1016/j.molmet.2013.09.002] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Revised: 09/09/2013] [Accepted: 09/13/2013] [Indexed: 02/06/2023] Open
Abstract
Obesity is characterized as an excess accumulation of body fat resulting from a positive energy balance. It is the major risk factor for type 2 diabetes (T2D). The evidence for familial aggregation of obesity and its associated metabolic diseases is substantial. To date, about 150 genetic loci identified in genome-wide association studies (GWAS) are linked with obesity and T2D, each accounting for only a small proportion of the predicted heritability. However, the percentage of overall trait variance explained by these associated loci is modest (~5-10% for T2D, ~2% for BMI). The lack of powerful genetic associations suggests that heritability is not entirely attributable to gene variations. Some of the familial aggregation as well as many of the effects of environmental exposures, may reflect epigenetic processes. This review summarizes our current knowledge on the genetic basis to individual risk of obesity and T2D, and explores the potential role of epigenetic contribution.
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Key Words
- ADCY3, adenylate cyclase 3
- AQP9, aquaporin 9
- BDNF, brain-derived neurotrophic factor
- CDKAL1, CDK5 regulatory subunit associated protein 1-like 1
- CPEB4, cytoplasmic polyadenylation element binding protein 4
- DUSP22, dual specificity phosphatase 22
- DUSP8, dual specificity phosphatase 8
- Epigenetics
- GALNT10, UDP-N-acetyl-alpha-d-galactosamine:polypeptide N-acetylgalactosaminyltransferase 10 (GalNAc-T10)
- GIPR, gastric inhibitory polypeptide receptor
- GNPDA2, glucosamine-6-phosphate deaminase 2
- GP2, glycoprotein 2 (zymogen granule membrane)
- GWAS
- HIPK3, homeodomain interacting protein kinase 3
- IFI16, interferon, gamma-inducible protein 16
- KCNQ1, potassium voltage-gated channel, KQT-like subfamily, member 1
- KLHL32, kelch-like family member 32
- LEPR, leptin receptor
- MAP2K4, mitogen-activated protein kinase kinase 4
- MAP2K5, mitogen-activated protein kinase kinase 5
- MIR148A, microRNA 148a
- MMP9, matrix metallopeptidase 9 (gelatinase B, 92 kDa gelatinase, 92 kDa type IV collagenase)
- MNDA, myeloid cell nuclear differentiation antigen
- NFE2L3, nuclear factor, erythroid 2-like 3
- Obesity
- PACS1, phosphofurin acidic cluster sorting protein 1
- PAX6, paired box gene 6
- PCSK1, proprotein convertase subtilisin/kexin type 1
- PGC1α, peroxisome proliferative activated receptor, gamma, coactivator 1 alpha, PM2OD1
- PRKCH, protein kinase C, eta
- PRKD1, protein kinase D1
- PRKG1, protein kinase, cGMP-dependent, type I
- Positional cloning
- QPCTL, glutaminyl-peptide cyclotransferase-like
- RBJ, DnaJ (Hsp40) homolog, subfamily C, member 27
- RFC5, replication factor C (activator 1) 5
- RMST, rhabdomyosarcoma 2 associated transcript (non-protein coding)
- SEC16B, SEC16 homolog B
- TFAP2B, transcription factor AP-2 beta (activating enhancer binding protein 2 beta)
- TNNI3, troponin I type 3 (cardiac)
- TNNT1, troponin T type 1 (skeletal, slow)
- Type 2 diabetes
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Affiliation(s)
| | | | - Annette Schürmann
- Corresponding author. Tel.: +49 33200 882368; fax: +49 33200 882334.
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Li S, Duan H, Pang Z, Zhang D, Duan H, Hjelmborg JVB, Tan Q, Kruse TA, Kyvik KO. Heritability of eleven metabolic phenotypes in Danish and Chinese twins: a cross-population comparison. Obesity (Silver Spring) 2013; 21:1908-14. [PMID: 23686756 DOI: 10.1002/oby.20217] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Accepted: 11/16/2012] [Indexed: 01/26/2023]
Abstract
OBJECTIVES A twin-based comparative study on the genetic influences in metabolic endophenotypes in two populations of substantial ethnic, environmental, and cultural differences was performed. DESIGN AND METHODS Data on 11 metabolic phenotypes including anthropometric measures, blood glucose, and lipids levels as well as blood pressure were available from 756 pairs of Danish twins (309 monozygotic and 447 dizygotic twin pairs) with a mean age of 38 years (range: 18-67) and from 325 pairs of Chinese twins (183 monozygotic and 142 dizygotic twin pairs) with a mean age of 40.5 years (range: 18-69). Twin modeling was performed on full and nested models with the best fitting models selected. RESULTS Heritability estimates were compared between Danish and Chinese samples to identify differential genetic influences on each of the phenotypes. Except for hip circumference, all other body measures exhibited similar heritability patterns in the two samples with body weight showing only a slight difference. Higher genetic influences were estimated for fasting blood glucose level in Chinese twins, whereas the Danish twins showed more genetic regulation over most lipids phenotypes. Systolic blood pressure was more genetically controlled in Danish than in Chinese twins. CONCLUSIONS Metabolic endophenotypes show disparity in their genetic determinants in populations under distinct environmental conditions.
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Affiliation(s)
- Shuxia Li
- Unit of Human Genetics, Institute of Clinical Research, University of Southern Denmark, Odense C, Denmark
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Lund ASQ, Hasselbalch AL, Gamborg M, Skogstrand K, Hougaard DM, Heitmann BL, Kyvik KO, Sørensen TI, Jess T. N-3 polyunsaturated fatty acids, body fat and inflammation. Obes Facts 2013; 6:369-79. [PMID: 23970146 PMCID: PMC5644672 DOI: 10.1159/000354663] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Accepted: 02/02/2012] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Based on animal studies, n-3 polyunsaturated fatty acids (PUFAs) have been suggested to lower the risk of obesity and inflammation. We aimed to investigate if, among humans, intake of n-3 PUFAs was associated with i) total body fat, ii) body fat distribution and iii) obesity-related inflammatory markers. METHODS The study population consisted of 1,212 healthy individuals with information on habitual food intake from food frequency questionnaires, six different measures of body fat, and levels of six circulating inflammatory markers. Multiple linear regression analysis of intakes of PUFAs in relation to outcomes were performed and adjusted for potential confounders. RESULTS Absolute n-3 PUFA intake, but not n-3/n-6, was inversely associated with the different measures of body fat. Among n-3 PUFA derivatives, only α-linolenic acid (ALA) was inversely associated with body fat measures. No significant interactions with the dietary macronutrient composition were observed. Pro-inflammatory cytokines were not associated with absolute PUFA intake, but the macrophage inflammatory protein-1α (MIP-1α) was associated with the n-3/n-6 ratio. CONCLUSION In humans, intake of n-3 PUFAs, in particular ALA, is beneficially associated with body fatness. The favourable association is, however, not reflected in systemic levels of pro-inflammatory cytokines, nor is it influenced by macronutrients in the diet.
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Affiliation(s)
- Anne-Sofie Q. Lund
- Institute of Preventive Medicine, Copenhagen University Hospital, Copenhagen, Denmark
| | | | - Michael Gamborg
- Institute of Preventive Medicine, Copenhagen University Hospital, Copenhagen, Denmark
| | - Kristin Skogstrand
- Department of Clinical Biochemistry and Immunology, Statens Serum Institute, Copenhagen, Denmark
| | - David M. Hougaard
- Department of Clinical Biochemistry and Immunology, Statens Serum Institute, Copenhagen, Denmark
| | - Berit L. Heitmann
- Research Unit for Dietary Studies, Institute of Preventive Medicine, Copenhagen, Denmark
| | - Kirsten O. Kyvik
- Institute of Regional Health Services Research and the Danish Twin Registry, Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark
| | | | - Tine Jess
- Institute of Preventive Medicine, Copenhagen University Hospital, Copenhagen, Denmark
- *Tine Jess MD DrSci(Med), Department of Epidemiology Research, Statens Serum Institut, Artellerivej 5, 2300 Copenhagen S (Denmark),
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The Danish Twin Registry: linking surveys, national registers, and biological information. Twin Res Hum Genet 2012; 16:104-11. [PMID: 23084092 DOI: 10.1017/thg.2012.77] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Over the last 60 years, the resources and the research in the Danish Twin Registry (DTR) have periodically been summarized. Here, we give a short overview of the DTR and a more comprehensive description of new developments in the twenty-first century. First, we outline our experience over the last decade of combining questionnaire and survey data with national demographic, social, and health registers in Statistics Denmark. Second, we describe our most recent data collection effort, which was conducted during the period 2008-2011 and included both in-person assessments of 14,000+ twins born 1931-1969 and sampling of biological material, hereby expanding and consolidating the DTR biobank. Third, two examples of intensively studied twin cohorts are given. The new developments in the DTR in the last decade have facilitated the ongoing research and laid the groundwork for new research directions.
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Gjesing AP, Ekstrøm CT, Eiberg H, Urhammer SA, Holst JJ, Pedersen O, Hansen T. Fasting and oral glucose-stimulated levels of glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) are highly familial traits. Diabetologia 2012; 55:1338-45. [PMID: 22349073 DOI: 10.1007/s00125-012-2484-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Accepted: 01/17/2012] [Indexed: 02/03/2023]
Abstract
AIMS/HYPOTHESIS Heritability estimates have shown a varying degree of genetic contribution to traits related to type 2 diabetes. Therefore, the objective of this study was to investigate the familiality of fasting and stimulated measures of plasma glucose, serum insulin, serum C-peptide, plasma glucose-dependent insulinotropic polypeptide (GIP) and plasma glucagon-like peptide-1 (GLP-1) among non-diabetic relatives of Danish type 2 diabetic patients. METHODS Sixty-one families comprising 193 non-diabetic offspring, 29 non-diabetic spouses, 72 non-diabetic relatives (parent, sibling, etc.) and two non-related relatives underwent a 4 h 75 g OGTT with measurements of plasma glucose, serum insulin, serum C-peptide, plasma GIP and plasma GLP-1 levels at 18 time points. Insulin secretion rates (ISR) and beta cell responses to glucose, GIP and GLP-1 were calculated. Familiality was estimated based on OGTT-derived measures. RESULTS A high level of familiality was observed during the OGTT for plasma levels of GIP and GLP-1, with peak familiality values of 74 ± 16% and 65 ± 15%, respectively (h (2) ± SE). Familiality values were lower for plasma glucose, serum insulin and serum C-peptide during the OGTT (range 8-48%, 14-44% and 15-61%, respectively). ISR presented the highest familiality value at fasting reaching 59 ± 16%. Beta cell responsiveness to glucose, GLP-1 and GIP also revealed a strong genetic influence, with peak familiality estimates of 62 ± 13%, 76 ± 15% and 70 ± 14%, respectively. CONCLUSIONS/INTERPRETATION Our results suggest that circulating levels of GIP and GLP-1 as well as beta cell response to these incretins are highly familial compared with more commonly investigated measures of glucose homeostasis such as fasting and stimulated plasma glucose, serum insulin and serum C-peptide.
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Affiliation(s)
- A P Gjesing
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, University of Copenhagen, Universitetsparken 1, DK-2100 Copenhagen, Denmark.
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Simonis-Bik AMC, Eekhoff EMW, Diamant M, Boomsma DI, Heine RJ, Dekker JM, Willemsen G, van Leeuwen M, de Geus EJC. The Heritability of HbA1c and Fasting Blood Glucose in Different Measurement Settings. Twin Res Hum Genet 2012; 11:597-602. [DOI: 10.1375/twin.11.6.597] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
AbstractIn an extended twin study we estimated the heritability of fasting HbA1c and blood glucose levels. Blood glucose was assessed in different settings (at home and in the clinic). We tested whether the genetic factors influencing fasting blood glucose levels overlapped with those influencing HbA1c and whether the same genetic factors were expressed across different settings. Fasting blood glucose was measured at home and during two visits to the clinic in 77 healthy families with same-sex twins and siblings, aged 20 to 45 years. HbA1c was measured during the first clinic visit. A 4-variate genetic structural equation model was used that estimated the heritability of each trait and the genetic correlations among traits. Heritability explained 75% of the variance in HbA1c. The heritability of fasting blood glucose was estimated at 66% at home and lower in the clinic (57% and 38%). Fasting blood glucose levels were significantly correlated across settings (0.34 <r< 0.54), mostly due to a common set of genes that explained between 53% and 95% of these correlations. Correlations between HbA1c and fasting blood glucoses were low (0.11 <r< 0.23) and genetic factors influencing HbA1c and fasting glucose were uncorrelated. These results suggest that in healthy adults the genes influencing HbA1c and fasting blood glucose reflect different aspects of the glucose metabolism. As a consequence these two glycemic parameters can not be used interchangeably in diagnostic procedures or in studies attempting to find genes for diabetes. Both contribute unique (genetic) information.
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30
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Skytthe A, Kyvik K, Bathum L, Holm N, Vaupel JW, Christensen K. The Danish Twin Registry in the New Millennium. Twin Res Hum Genet 2012. [DOI: 10.1375/twin.9.6.763] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
AbstractThe Danish Twin Registry is the oldest national twin register in the world, initiated in 1954, and, by the end of 2005, contained more than 75,000 twin pairs born in the between 1870 and 2004. The Danish Twin Registry is used as a source for studies on the genetic influence on normal variation in clinical parameters associated with the metabolic syndrome and cardiovascular diseases, clinical studies of specific diseases, and aging and age-related health problems. The combination of survey data, clinical data and linkage to national health-related registers enables follow-up studies of both the general twin population and twins from clinical studies. This paper summarizes the newest extension of the register and gives examples of new developments and phenotypes studied.
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Barker A, Sharp SJ, Timpson NJ, Bouatia-Naji N, Warrington NM, Kanoni S, Beilin LJ, Brage S, Deloukas P, Evans DM, Grontved A, Hassanali N, Lawlor DA, Lecoeur C, Loos RJ, Lye SJ, McCarthy MI, Mori TA, Ndiaye NC, Newnham JP, Ntalla I, Pennell CE, St Pourcain B, Prokopenko I, Ring SM, Sattar N, Visvikis-Siest S, Dedoussis GV, Palmer LJ, Froguel P, Smith GD, Ekelund U, Wareham NJ, Langenberg C. Association of genetic Loci with glucose levels in childhood and adolescence: a meta-analysis of over 6,000 children. Diabetes 2011; 60:1805-12. [PMID: 21515849 PMCID: PMC3114379 DOI: 10.2337/db10-1575] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To investigate whether associations of common genetic variants recently identified for fasting glucose or insulin levels in nondiabetic adults are detectable in healthy children and adolescents. RESEARCH DESIGN AND METHODS A total of 16 single nucleotide polymorphisms (SNPs) associated with fasting glucose were genotyped in six studies of children and adolescents of European origin, including over 6,000 boys and girls aged 9-16 years. We performed meta-analyses to test associations of individual SNPs and a weighted risk score of the 16 loci with fasting glucose. RESULTS Nine loci were associated with glucose levels in healthy children and adolescents, with four of these associations reported in previous studies and five reported here for the first time (GLIS3, PROX1, SLC2A2, ADCY5, and CRY2). Effect sizes were similar to those in adults, suggesting age-independent effects of these fasting glucose loci. Children and adolescents carrying glucose-raising alleles of G6PC2, MTNR1B, GCK, and GLIS3 also showed reduced β-cell function, as indicated by homeostasis model assessment of β-cell function. Analysis using a weighted risk score showed an increase [β (95% CI)] in fasting glucose level of 0.026 mmol/L (0.021-0.031) for each unit increase in the score. CONCLUSIONS Novel fasting glucose loci identified in genome-wide association studies of adults are associated with altered fasting glucose levels in healthy children and adolescents with effect sizes comparable to adults. In nondiabetic adults, fasting glucose changes little over time, and our results suggest that age-independent effects of fasting glucose loci contribute to long-term interindividual differences in glucose levels from childhood onwards.
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Affiliation(s)
- Adam Barker
- Medical Research Council Epidemiology Unit, Addenbrooke’s Hospital, Institute of Metabolic Science, Cambridge, U.K
| | - Stephen J. Sharp
- Medical Research Council Epidemiology Unit, Addenbrooke’s Hospital, Institute of Metabolic Science, Cambridge, U.K
| | - Nicholas J. Timpson
- MRC Centre for Causal Analyses in Translational Epidemiology (MRC CAiTE), University of Bristol, Bristol, U.K
- School of Social and Community Medicine, University of Bristol, Bristol, U.K
| | - Nabila Bouatia-Naji
- CNRS UMR 8199, Institut Pasteur de Lille, Lille, France
- Lille Nord de France University, Lille, France
| | - Nicole M. Warrington
- School of Women’s and Infants’ Health, The University of Western Australia, Perth, Western Australia
| | - Stavroula Kanoni
- Department of Nutrition-Dietetics, Harokopio University, Athens, Greece
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, U.K
| | - Lawrence J. Beilin
- School of Medicine and Pharmacology, The University of Western Australia, Perth, Western Australia
| | - Soren Brage
- Medical Research Council Epidemiology Unit, Addenbrooke’s Hospital, Institute of Metabolic Science, Cambridge, U.K
| | - Panos Deloukas
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, U.K
| | - David M. Evans
- MRC Centre for Causal Analyses in Translational Epidemiology (MRC CAiTE), University of Bristol, Bristol, U.K
- School of Social and Community Medicine, University of Bristol, Bristol, U.K
| | | | - Neelam Hassanali
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Oxford, U.K
| | - Deborah A. Lawlor
- MRC Centre for Causal Analyses in Translational Epidemiology (MRC CAiTE), University of Bristol, Bristol, U.K
- School of Social and Community Medicine, University of Bristol, Bristol, U.K
| | - Cecile Lecoeur
- CNRS UMR 8199, Institut Pasteur de Lille, Lille, France
- Lille Nord de France University, Lille, France
| | - Ruth J.F. Loos
- Medical Research Council Epidemiology Unit, Addenbrooke’s Hospital, Institute of Metabolic Science, Cambridge, U.K
| | - Stephen J. Lye
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, University of Toronto, Toronto, Canada
| | - Mark I. McCarthy
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Oxford, U.K
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, U.K
| | - Trevor A. Mori
- School of Medicine and Pharmacology, The University of Western Australia, Perth, Western Australia
| | - Ndeye Coumba Ndiaye
- “Cardiovascular Genetics” Research Unit, Université Henri Poincaré, Nancy, France
| | - John P. Newnham
- School of Women’s and Infants’ Health, The University of Western Australia, Perth, Western Australia
| | - Ioanna Ntalla
- Department of Nutrition-Dietetics, Harokopio University, Athens, Greece
| | - Craig E. Pennell
- School of Women’s and Infants’ Health, The University of Western Australia, Perth, Western Australia
| | - Beate St Pourcain
- School of Social and Community Medicine, University of Bristol, Bristol, U.K
- The Avon Longitudinal Study of Parents and Children, University of Bristol, Bristol, U.K
| | - Inga Prokopenko
- Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Oxford, U.K
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, U.K
| | - Susan M. Ring
- School of Social and Community Medicine, University of Bristol, Bristol, U.K
- The Avon Longitudinal Study of Parents and Children, University of Bristol, Bristol, U.K
| | - Naveed Sattar
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, U.K
| | | | | | - Lyle J. Palmer
- Ontario Institute for Cancer Research, University of Toronto, Toronto, Canada
| | - Philippe Froguel
- CNRS UMR 8199, Institut Pasteur de Lille, Lille, France
- Lille Nord de France University, Lille, France
- Department of Genomics of Common Disease, School of Public Health, Imperial College London, Hammersmith Hospital, London, U.K
| | - George Davey Smith
- MRC Centre for Causal Analyses in Translational Epidemiology (MRC CAiTE), University of Bristol, Bristol, U.K
- School of Social and Community Medicine, University of Bristol, Bristol, U.K
| | - Ulf Ekelund
- Medical Research Council Epidemiology Unit, Addenbrooke’s Hospital, Institute of Metabolic Science, Cambridge, U.K
- School of Health and Medical Sciences, Örebro University, Örebro, Sweden
| | - Nicholas J. Wareham
- Medical Research Council Epidemiology Unit, Addenbrooke’s Hospital, Institute of Metabolic Science, Cambridge, U.K
| | - Claudia Langenberg
- Medical Research Council Epidemiology Unit, Addenbrooke’s Hospital, Institute of Metabolic Science, Cambridge, U.K
- Corresponding author: Claudia Langenberg,
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Duan H, Pang Z, Zhang D, Li S, Kruse TA, Kyvik KO, Christensen K, Tan Q. Genetic and environmental dissections of sub-phenotypes of metabolic syndrome in the Chinese population: a twin-based heritability study. Obes Facts 2011; 4:99-104. [PMID: 21577016 PMCID: PMC6444466 DOI: 10.1159/000327735] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
OBJECTIVE We perform a comprehensive heritability study on multiple phenotypes related to metabolic syndrome using Chinese twins to assess the genetic and environmental effects in determining the variation and covariation of the phenotypes in the Chinese population. METHODS The studied sample contains 654 twins collected in the Qingdao municipality. A total of 10 phenotypes covering anthropometric measurements, plasma glucose levels, lipids, blood pressures etc. were examined. Univariate and bivariate structural equation models were fitted for assessing the genetic and environmental contributions. RESULTS The AE model combining additive genetic (A) and unique environmental (E) factors produced the best fit for all phenotypes except for triglyceride. Modest to high heritability estimates were obtained in univariate analysis ranging from 0.5 for total cholesterol to 0.78 for weight. The bivariate model estimated high genetic correlations between systolic and diastolic blood pressures, between total cholesterol and low density lipoprotein cholesterol, modest genetic correlations between BMI and blood pressures. No significant common environmental correlation was found between any pair of the phenotypes. CONCLUSIONS Our results showed significant genetic contributions to the sub-phenotypes of metabolic syndrome. Although pleiotropic genetic control may exist for some physiologically similar phenotypes, our results do not support a common genetic mechanism among the phenotypes covered in our study.
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Affiliation(s)
- Haiping Duan
- Qingdao Center for Disease Control and Prevention
- Department of Public Health, Qingdao University Medical College, Qingdao China
| | - Zengchang Pang
- Qingdao Center for Disease Control and Prevention
- Department of Public Health, Qingdao University Medical College, Qingdao China
| | - Dongfeng Zhang
- Department of Public Health, Qingdao University Medical College, Qingdao China
| | - Shuxia Li
- Epidemiology, Institute of Public Health, University of Southern Denmark
| | | | - Kirsten Ohm Kyvik
- Epidemiology, Institute of Public Health, University of Southern Denmark
- Institute for Regional Health Services Research, University of Southern Denmark
| | - Kaare Christensen
- Epidemiology, Institute of Public Health, University of Southern Denmark
- Department of Clinical Genetics, Odense University Hospital
- Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark
| | - Qihua Tan
- Epidemiology, Institute of Public Health, University of Southern Denmark
- Department of Clinical Genetics, Odense University Hospital
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Drobnjak D, Taarnhøj NCBB, Mitchell P, Wang JJ, Tan A, Kessel L, Hougaard JL, Sørensen TIA, Larsen M. Heritability of optic disc diameters: a twin study. Acta Ophthalmol 2011; 89:e193-8. [PMID: 20636443 DOI: 10.1111/j.1755-3768.2010.01923.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PURPOSE To assess the relative influence of genetic and environmental factors on optic disc size and cup/disc ratio in healthy eyes. METHODS A sample of 55 monozygotic and 50 dizygotic healthy twin pairs aged 20-46, all having the same sex within pairs (47 pairs were male) had optic discs measured from colour fundus photographs according to the Wisconsin Protocol. Structural equation modelling was used to estimate the relative contribution of genetic and environmental factors to the phenotype. RESULTS Disc dimensions did not vary significantly by age or sex. After adjusting for age and sex, additive genetic factors (i.e. heritability) explained 77% (95% CI: 65-85%) of variation of vertical disc diameters, whereas estimated unshared environmental effect was 23% (95% CI: 15-35%). For vertical cup diameters, heritability accounted for 70% (95% CI: 55-80%) and environmental factors 30% (95% CI: 20-45%). For cup/disc ratio, additive genetic and unshared environmental factors explained 66% (95% CI: 48-77%) and 34% (95% CI: 23-52%) of the variations, respectively. DISCUSSION In this healthy twin sample, we found that three quarters of the variations in vertical optic disc and optic cup diameters were attributable to genetic influence.
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Affiliation(s)
- Dragana Drobnjak
- Department of Ophthalmology, Oslo University Hospital, Ullevaal, Center for Eye Research, University of Oslo, Norway.
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Iachine I, Petersen HC, Kyvik KO. Robust tests for the equality of variances for clustered data. J STAT COMPUT SIM 2010. [DOI: 10.1080/00949650802641841] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Saxena R, Hivert MF, Langenberg C, Tanaka T, Pankow JS, Vollenweider P, Lyssenko V, Bouatia-Naji N, Dupuis J, Jackson AU, Kao WHL, Li M, Glazer NL, Manning AK, Luan J, Stringham HM, Prokopenko I, Johnson T, Grarup N, Boesgaard TW, Lecoeur C, Shrader P, O'Connell J, Ingelsson E, Couper DJ, Rice K, Song K, Andreasen CH, Dina C, Köttgen A, Le Bacquer O, Pattou F, Taneera J, Steinthorsdottir V, Rybin D, Ardlie K, Sampson M, Qi L, van Hoek M, Weedon MN, Aulchenko YS, Voight BF, Grallert H, Balkau B, Bergman RN, Bielinski SJ, Bonnefond A, Bonnycastle LL, Borch-Johnsen K, Böttcher Y, Brunner E, Buchanan TA, Bumpstead SJ, Cavalcanti-Proença C, Charpentier G, Chen YDI, Chines PS, Collins FS, Cornelis M, J Crawford G, Delplanque J, Doney A, Egan JM, Erdos MR, Firmann M, Forouhi NG, Fox CS, Goodarzi MO, Graessler J, Hingorani A, Isomaa B, Jørgensen T, Kivimaki M, Kovacs P, Krohn K, Kumari M, Lauritzen T, Lévy-Marchal C, Mayor V, McAteer JB, Meyre D, Mitchell BD, Mohlke KL, Morken MA, Narisu N, Palmer CNA, Pakyz R, Pascoe L, Payne F, Pearson D, Rathmann W, Sandbaek A, Sayer AA, Scott LJ, Sharp SJ, Sijbrands E, Singleton A, Siscovick DS, Smith NL, Sparsø T, Swift AJ, Syddall H, Thorleifsson G, Tönjes A, Tuomi T, Tuomilehto J, Valle TT, Waeber G, Walley A, Waterworth DM, Zeggini E, Zhao JH, Illig T, Wichmann HE, Wilson JF, van Duijn C, Hu FB, Morris AD, Frayling TM, Hattersley AT, Thorsteinsdottir U, Stefansson K, Nilsson P, Syvänen AC, Shuldiner AR, Walker M, Bornstein SR, Schwarz P, Williams GH, Nathan DM, Kuusisto J, Laakso M, Cooper C, Marmot M, Ferrucci L, Mooser V, Stumvoll M, Loos RJF, Altshuler D, Psaty BM, Rotter JI, Boerwinkle E, Hansen T, Pedersen O, Florez JC, McCarthy MI, Boehnke M, Barroso I, Sladek R, Froguel P, Meigs JB, Groop L, Wareham NJ, Watanabe RM. Genetic variation in GIPR influences the glucose and insulin responses to an oral glucose challenge. Nat Genet 2010; 42:142-8. [PMID: 20081857 PMCID: PMC2922003 DOI: 10.1038/ng.521] [Citation(s) in RCA: 481] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2009] [Accepted: 12/10/2009] [Indexed: 12/18/2022]
Abstract
Glucose levels 2 h after an oral glucose challenge are a clinical measure of glucose tolerance used in the diagnosis of type 2 diabetes. We report a meta-analysis of nine genome-wide association studies (n = 15,234 nondiabetic individuals) and a follow-up of 29 independent loci (n = 6,958-30,620). We identify variants at the GIPR locus associated with 2-h glucose level (rs10423928, beta (s.e.m.) = 0.09 (0.01) mmol/l per A allele, P = 2.0 x 10(-15)). The GIPR A-allele carriers also showed decreased insulin secretion (n = 22,492; insulinogenic index, P = 1.0 x 10(-17); ratio of insulin to glucose area under the curve, P = 1.3 x 10(-16)) and diminished incretin effect (n = 804; P = 4.3 x 10(-4)). We also identified variants at ADCY5 (rs2877716, P = 4.2 x 10(-16)), VPS13C (rs17271305, P = 4.1 x 10(-8)), GCKR (rs1260326, P = 7.1 x 10(-11)) and TCF7L2 (rs7903146, P = 4.2 x 10(-10)) associated with 2-h glucose. Of the three newly implicated loci (GIPR, ADCY5 and VPS13C), only ADCY5 was found to be associated with type 2 diabetes in collaborating studies (n = 35,869 cases, 89,798 controls, OR = 1.12, 95% CI 1.09-1.15, P = 4.8 x 10(-18)).
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Affiliation(s)
- Richa Saxena
- Broad Institute of Harvard and Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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Torres de Heens GL, Loos BG, van der Velden U. Monozygotic twins are discordant for chronic periodontitis: clinical and bacteriological findings. J Clin Periodontol 2010; 37:120-8. [DOI: 10.1111/j.1600-051x.2009.01511.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang X, Ding X, Su S, Spector TD, Mangino M, Iliadou A, Snieder H. Heritability of insulin sensitivity and lipid profile depend on BMI: evidence for gene-obesity interaction. Diabetologia 2009; 52:2578-84. [PMID: 19820914 PMCID: PMC2776165 DOI: 10.1007/s00125-009-1524-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2009] [Accepted: 08/05/2009] [Indexed: 11/21/2022]
Abstract
AIMS/HYPOTHESIS Evidence from candidate gene studies suggests that obesity may modify genetic susceptibility to type 2 diabetes and dyslipidaemia. On an aggregate level, gene-obesity interactions are expected to result in different heritability estimates at different obesity levels. However, this hypothesis has never been tested. METHOD The present study included 2,180 British female twins. BMI was used as an index of general obesity. Outcome measures were insulin sensitivity (indexed by quantitative insulin-sensitivity check index [QUICKI]) and fasting plasma lipid profile. Structural equation modelling was used to test whether BMI interacted with latent genetic and environmental effects to impact on the outcome measures. RESULTS Genetic influences on triacylglycerol increased with BMI (p < 0.001) whereas the unique environmental influence on QUICKI decreased with BMI (p < 0.001), resulting in a higher heritability estimate for both measures at higher BMI levels. This was further illustrated by stratified analysis in twin pairs concordant for normal weight and twin pairs concordant for overweight. Heritability was 19 percentage points higher for triacylglycerol (p < 0.001) and 31 percentage points higher for QUICKI (p < 0.01) among twins concordant for overweight than among twins concordant for normal weight. BMI had no moderator effect on the latent genetic and environmental factors for total cholesterol and HDL-cholesterol. CONCLUSIONS/INTERPRETATION Our results suggest that the expression of genes influencing triacylglycerol and insulin sensitivity can vary as a function of obesity status. The substantial increases in the genetic contribution to the total variance in insulin sensitivity and triacylglycerols at higher BMIs may prove extremely valuable in the search for candidate genes.
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Affiliation(s)
- X Wang
- Georgia Prevention Institute, Medical College of Georgia, Building HS-1640, Augusta, GA 30912, USA.
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HOEGH SILJEVERMEDAL, VOSS ANNE, SORENSEN GRITHLYKKE, HØJ ANETTE, BENDIXEN CHRISTIAN, JUNKER PETER, HOLMSKOV UFFE. Circulating Surfactant Protein D Is Decreased in Systemic Lupus Erythematosus. J Rheumatol 2009; 36:2449-53. [DOI: 10.3899/jrheum.090069] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Objective.Deficiencies of innate immune molecules like mannan binding lectin (MBL) have been implicated in the pathogenesis of systemic lupus erythematosus (SLE). Surfactant protein D (SP-D) and MBL belong to the same family of innate immune molecules — the collectins, which share important structural and functional properties. We aimed to compare concentrations of serum SP-D in patients with SLE and in healthy controls, and to investigate if SP-D is associated with selected disease indicators. We investigated the possible association of the Met11Thr polymorphism with disease, since this polymorphism is an important determinant for serum level, oligomerization pattern, and function of SP-D.Methods.Serum SP-D was measured using a 5-layer ELISA in 70 SLE patients and 1476 healthy subjects. DNA was genotyped for the Met11Thr variant.Results.Median SP-D level in serum was 911 ng/ml (95% CI 776–1118) in patients and 1068 ng/ml (95% CI 901–1246) in controls (p = 0.0004). Circulating SP-D did not differ significantly in patients with high, intermediate, or low SLE disease activity. Similarly, SP-D did not correlate with C-reactive protein, erythrocyte sedimentation rate, and anti-dsDNA seropositivity. Genetic analysis did not support an association of the Met11Thr genotype with SLE.Conclusion.These findings suggest that low SP-D, unrelated to conventional disease indicators, represents an aspect of SLE etiopathogenesis.
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Stančáková A, Kuulasmaa T, Paananen J, Jackson AU, Bonnycastle LL, Collins FS, Boehnke M, Kuusisto J, Laakso M. Association of 18 confirmed susceptibility loci for type 2 diabetes with indices of insulin release, proinsulin conversion, and insulin sensitivity in 5,327 nondiabetic Finnish men. Diabetes 2009; 58:2129-36. [PMID: 19502414 PMCID: PMC2731523 DOI: 10.2337/db09-0117] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVE We investigated the effects of 18 confirmed type 2 diabetes risk single nucleotide polymorphisms (SNPs) on insulin sensitivity, insulin secretion, and conversion of proinsulin to insulin. RESEARCH DESIGN AND METHODS A total of 5,327 nondiabetic men (age 58 +/- 7 years, BMI 27.0 +/- 3.8 kg/m(2)) from a large population-based cohort were included. Oral glucose tolerance tests and genotyping of SNPs in or near PPARG, KCNJ11, TCF7L2, SLC30A8, HHEX, LOC387761, CDKN2B, IGF2BP2, CDKAL1, HNF1B, WFS1, JAZF1, CDC123, TSPAN8, THADA, ADAMTS9, NOTCH2, KCNQ1, and MTNR1B were performed. HNF1B rs757210 was excluded because of failure to achieve Hardy-Weinberg equilibrium. RESULTS Six SNPs (TCF7L2, SLC30A8, HHEX, CDKN2B, CDKAL1, and MTNR1B) were significantly (P < 6.9 x 10(-4)) and two SNPs (KCNJ11 and IGF2BP2) were nominally (P < 0.05) associated with early-phase insulin release (InsAUC(0-30)/GluAUC(0-30)), adjusted for age, BMI, and insulin sensitivity (Matsuda ISI). Combined effects of these eight SNPs reached -32% reduction in InsAUC(0-30)/GluAUC(0-30) in carriers of >or=11 vs. <or=3 weighted risk alleles. Four SNPs (SLC30A8, HHEX, CDKAL1, and TCF7L2) were significantly or nominally associated with indexes of proinsulin conversion. Three SNPs (KCNJ11, HHEX, and TSPAN8) were nominally associated with Matsuda ISI (adjusted for age and BMI). The effect of HHEX on Matsuda ISI became significant after additional adjustment for InsAUC(0-30)/GluAUC(0-30). Nine SNPs did not show any associations with examined traits. CONCLUSIONS Eight type 2 diabetes-related loci were significantly or nominally associated with impaired early-phase insulin release. Effects of SLC30A8, HHEX, CDKAL1, and TCF7L2 on insulin release could be partially explained by impaired proinsulin conversion. HHEX might influence both insulin release and insulin sensitivity.
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Affiliation(s)
- Alena Stančáková
- Department of Medicine, University of Kuopio and Kuopio University Hospital, Kuopio, Finland
| | - Teemu Kuulasmaa
- Department of Medicine, University of Kuopio and Kuopio University Hospital, Kuopio, Finland
| | - Jussi Paananen
- Department of Medicine, University of Kuopio and Kuopio University Hospital, Kuopio, Finland
| | - Anne U. Jackson
- Center for Statistical Genetics, Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, Michigan
| | - Lori L. Bonnycastle
- National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
| | - Francis S. Collins
- National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
| | - Michael Boehnke
- Center for Statistical Genetics, Department of Biostatistics, University of Michigan School of Public Health, Ann Arbor, Michigan
| | - Johanna Kuusisto
- Department of Medicine, University of Kuopio and Kuopio University Hospital, Kuopio, Finland
| | - Markku Laakso
- Department of Medicine, University of Kuopio and Kuopio University Hospital, Kuopio, Finland
- Corresponding author: Markku Laakso,
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Monrad RN, Grunnet LG, Rasmussen EL, Malis C, Vaag A, Poulsen P. Age-dependent nongenetic influences of birth weight and adult body fat on insulin sensitivity in twins. J Clin Endocrinol Metab 2009; 94:2394-9. [PMID: 19417034 DOI: 10.1210/jc.2008-1858] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
OBJECTIVE We hypothesized a nongenetic influence of birth weight (BW) and twin and zygosity status on dual-energy x-ray absorptiometry determined adult total and regional body composition and a quantitative equal, although independent, importance of adult body composition and BW for insulin sensitivity. DESIGN AND METHODS This was a clinical study of 110 young (aged 22-31 yr) and 86 elderly twins (aged 57-66 yr) and 32 age-matched controls with measures of BW, adult body composition, and insulin sensitivity. RESULTS BW was nongenetically, positively associated with height, weight, and total and regional (trunk, arm, and leg) fat mass and percentages in the young twins. In the elderly twins, BW was persistently nongenetically related to height as well as leg fat mass and percentage. Insulin sensitivity was nongenetically influenced by total fat percentage as well as arm and trunk fat percentages, all leading to a decrease in insulin sensitivity by 20% per sd increase in the elderly twins. Conversely, a sd increase in BW led to an increase of 16% in insulin sensitivity. Total body fat and regional fat was similarly associated with insulin sensitivity in the younger twins, whereas no influence of BW was seen. CONCLUSION BW was nongenetically, positively associated with adult height and total and regional fat mass in an age-dependent manner. BW and total and regional body fat percentages were nongenetically associated with insulin sensitivity in the elderly subjects, supporting an influence of the fetal environment on insulin sensitivity that is quantitatively similar to and independent of the effect of adult adiposity.
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Liu GF, Riese H, Spector TD, Mangino M, O'Dell SD, Stolk RP, Snieder H. Bivariate genetic modelling of the response to an oral glucose tolerance challenge: a gene x environment interaction approach. Diabetologia 2009; 52:1048-55. [PMID: 19288074 DOI: 10.1007/s00125-009-1325-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2008] [Accepted: 02/17/2009] [Indexed: 11/29/2022]
Abstract
AIMS/HYPOTHESIS Twin and family studies have shown the importance of genetic factors influencing fasting and 2 h glucose and insulin levels. However, the genetics of the physiological response to a glucose load has not been thoroughly investigated. METHODS We studied 580 monozygotic and 1,937 dizygotic British female twins from the Twins UK Registry. The effects of genetic and environmental factors on fasting and 2 h glucose and insulin levels were estimated using univariate genetic modelling. Bivariate model fitting was used to investigate the glucose and insulin responses to a glucose load, i.e. an OGTT. RESULTS The genetic effect on fasting and 2 h glucose and insulin levels ranged between 40% and 56% after adjustment for age and BMI. Exposure to a glucose load resulted in the emergence of novel genetic effects on 2 h glucose independent of the fasting level, accounting for about 55% of its heritability. For 2 h insulin, the effect of the same genes that already influenced fasting insulin was amplified by about 30%. CONCLUSIONS/INTERPRETATION Exposure to a glucose challenge uncovers new genetic variance for glucose and amplifies the effects of genes that already influence the fasting insulin level. Finding the genes acting on 2 h glucose independently of fasting glucose may offer new aetiological insight into the risk of cardiovascular events and death from all causes.
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Affiliation(s)
- G F Liu
- Department of Epidemiology, Unit of Genetic Epidemiology and Bioinformatics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.
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Wang C, Cheng Y, Liu T, Li Q, Fillingim RB, Wallace MR, Staud R, Kaplan L, Wu R. A computational model for sex-specific genetic architecture of complex traits in humans: implications for mapping pain sensitivity. Mol Pain 2008; 4:13. [PMID: 18416828 PMCID: PMC2422840 DOI: 10.1186/1744-8069-4-13] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2007] [Accepted: 04/16/2008] [Indexed: 11/17/2022] Open
Abstract
Understanding differences in the genetic architecture of complex traits between the two sexes has significant implications for evolutionary studies and clinical diagnosis. However, our knowledge about sex-specific genetic architecture is limited largely because of a lack of analytical models that can detect and quantify the effects of sex on the complexity of quantitative genetic variation. Here, we derived a statistical model for mapping DNA sequence variants that contribute to sex-specific differences in allele frequencies, linkage disequilibria, and additive and dominance genetic effects due to haplotype diversity. This model allows a genome-wide search for functional haplotypes and the estimation and test of haplotype by sex interactions and sex-specific heritability. The model, validated by simulation studies, was used to detect sex-specific functional haplotypes that encode a pain sensitivity trait in humans. The model could have important implications for mapping complex trait genes and studying the detailed genetic architecture of sex-specific differences.
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Affiliation(s)
- Chenguang Wang
- Department of Statistics, University of Florida, Gainesville, FL 32611 USA.
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Hoegh SV, Lindegaard HM, Sorensen GL, Høj A, Bendixen C, Junker P, Holmskov U. Circulating Surfactant Protein D is Decreased in Early Rheumatoid Arthritis: A 1-year Prospective Study. Scand J Immunol 2007; 67:71-6. [DOI: 10.1111/j.1365-3083.2007.02039.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Souren NY, Paulussen ADC, Loos RJF, Gielen M, Beunen G, Fagard R, Derom C, Vlietinck R, Zeegers MP. Anthropometry, carbohydrate and lipid metabolism in the East Flanders Prospective Twin Survey: heritabilities. Diabetologia 2007; 50:2107-16. [PMID: 17694296 PMCID: PMC2039867 DOI: 10.1007/s00125-007-0784-z] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2007] [Accepted: 06/19/2007] [Indexed: 11/30/2022]
Abstract
AIMS/HYPOTHESIS We determined the genetic contribution of 18 anthropometric and metabolic risk factors of type 2 diabetes using a young healthy twin population. METHODS Traits were measured in 240 monozygotic (MZ) and 138 dizygotic (DZ) twin pairs aged 18 to 34 years. Twins were recruited from the Belgian population-based East Flanders Prospective Twin Survey, which is characterised by its accurate zygosity determination and extensive collection of perinatal and placental data, including information on chorionicity. Heritability was estimated using structural equation modelling implemented in the Mx software package. RESULTS Intra-pair correlations of the anthropometric and metabolic characteristics did not differ between MZ monochorionic and MZ dichorionic pairs; consequently heritabilities were estimated using the classical twin approach. For body mass, BMI and fat mass, quantitative sex differences were observed; genetic variance explained 84, 85 and 81% of the total variation in men and 74, 75 and 70% in women, respectively. Heritability estimates of the waist-to-hip ratio, sum of four skinfold thicknesses and lean body mass were 70, 74 and 81%, respectively. The heritability estimates of fasting glucose, fasting insulin, homeostasis model assessment of insulin resistance and beta cell function, as well as insulin-like growth factor binding protein-1 levels were 67, 49, 48, 62 and 47%, in that order. Finally, for total cholesterol, LDL-cholesterol, HDL-cholesterol, total cholesterol:HDL-cholesterol ratio, triacylglycerol, NEFA and leptin levels, genetic factors explained 75, 78, 76, 79, 58, 37 and 53% of the total variation, respectively. CONCLUSIONS/INTERPRETATION Genetic factors explain the greater part of the variation in traits related to obesity, glucose intolerance/insulin resistance and dyslipidaemia.
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Affiliation(s)
- N. Y. Souren
- Department of Genetics and Cell Biology, Maastricht University, Maastricht, the Netherlands
- Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, Maastricht, the Netherlands
| | - A. D. C. Paulussen
- Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, Maastricht, the Netherlands
- Division of Clinical Genetics, Academic Hospital Maastricht, Maastricht, the Netherlands
- Academic Hospital Maastricht, Division of Clinical Genetics, Joseph Bechlaan 113, 6229 GR Maastricht, the Netherlands
| | - R. J. F. Loos
- Medical Research Council Epidemiology Unit, Cambridge, UK
- Department of Biomedical Kinesiology, Faculty of Kinesiology and Rehabilitation Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - M. Gielen
- Department of Genetics and Cell Biology, Maastricht University, Maastricht, the Netherlands
- Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, Maastricht, the Netherlands
| | - G. Beunen
- Department of Biomedical Kinesiology, Faculty of Kinesiology and Rehabilitation Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - R. Fagard
- Hypertension and Cardiovascular Rehabilitation Unit, Department of Cardiovascular Diseases, Katholieke Universiteit Leuven, Leuven, Belgium
| | - C. Derom
- Department of Human Genetics, Katholieke Universiteit Leuven, Leuven, Belgium
| | - R. Vlietinck
- Department of Human Genetics, Katholieke Universiteit Leuven, Leuven, Belgium
| | - M. P. Zeegers
- Department of Genetics and Cell Biology, Maastricht University, Maastricht, the Netherlands
- Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, Maastricht, the Netherlands
- Unit of Genetic Epidemiology, Department of Public Health and Epidemiology, University of Birmingham, Birmingham, UK
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Benyamin B, Sørensen TIA, Schousboe K, Fenger M, Visscher PM, Kyvik KO. Are there common genetic and environmental factors behind the endophenotypes associated with the metabolic syndrome? Diabetologia 2007; 50:1880-1888. [PMID: 17624514 DOI: 10.1007/s00125-007-0758-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2006] [Accepted: 06/05/2007] [Indexed: 01/01/2023]
Abstract
AIMS/HYPOTHESIS The cluster of obesity, insulin resistance, dyslipidaemia and hypertension, called the metabolic syndrome, has been suggested as a risk factor for cardiovascular disease and type 2 diabetes. The aim of the present study was to evaluate whether there are common genetic and environmental factors influencing this cluster in a general population of twin pairs. MATERIALS AND METHODS A multivariate genetic analysis was performed on nine endophenotypes associated with the metabolic syndrome from 625 adult twin pairs of the GEMINAKAR study of the Danish Twin Registry. RESULTS All endophenotypes showed moderate to high heritability (0.31-0.69) and small common environmental variance (0.05-0.21). In general, genetic and phenotypic correlations between the endophenotypes were strong only within sets of physiologically similar endophenotypes, but weak to moderate for other pairs of endophenotypes. However, moderate correlations between insulin resistance indices and either obesity-related endophenotypes or triacylglycerol levels indicated that some common genetic backgrounds are shared between those components. CONCLUSIONS/INTERPRETATION We demonstrated that, in a general population, the endophenotypes associated with the metabolic syndrome apparently do not share a substantial common genetic or familial environmental background.
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Affiliation(s)
- B Benyamin
- Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, Scotland, UK
- Genetic Epidemiology, Queensland Institute of Medical Research, Brisbane, QLD, Australia
| | - T I A Sørensen
- Danish Epidemiology Science Centre, Institute of Preventive Medicine, Copenhagen University Hospitals, Centre for Health and Society, Copenhagen, Denmark
| | - K Schousboe
- The Danish Twin Registry, Epidemiology, Institute of Public Health, University of Southern Denmark, Sdr. Boulevard 23A, 5000, Odense C, Denmark
| | - M Fenger
- Department of Clinical Biochemistry, University Hospital of Copenhagen, Hvidovre, Denmark
| | - P M Visscher
- Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, Scotland, UK
- Genetic Epidemiology, Queensland Institute of Medical Research, Brisbane, QLD, Australia
| | - K O Kyvik
- The Danish Twin Registry, Epidemiology, Institute of Public Health, University of Southern Denmark, Sdr. Boulevard 23A, 5000, Odense C, Denmark.
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Bathum L, Petersen I, Christiansen L, Konieczna A, Sørensen TIA, Kyvik KO. Genetic and Environmental Influences on Plasma Homocysteine: Results from a Danish Twin Study. Clin Chem 2007; 53:971-9. [PMID: 17412799 DOI: 10.1373/clinchem.2006.082149] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Background: Increased plasma homocysteine has been linked to many clinical conditions including atherosclerosis and ischemic stroke. We assessed the genetic and environmental influences on homocysteine in adult twins and tested the influence of 3 candidate polymorphisms.
Methods: Homocysteine was analyzed in 1206 healthy twins, who were genotyped for 3 polymorphisms: MTHFR 677C>T, MTR 2756A>G, and NNMT (dbSNP: rs694539). To perform quantitative trait linkage analysis of the MTHFR locus, the genotyping was supplemented with 2 genetic markers localized on each site of the MTHFR locus. The twin data were analyzed using biometric structural equation models as well as a combined association and linkage analysis in 2 age cohorts.
Results: Age, sex, and MTHFR genotype have a significant impact on homocysteine concentrations, whereas the other genotypes were not associated with homocysteine concentrations. The variance in homocysteine could be solely ascribed to additive genetic and nonshared environmental factors, with an estimated additive genetic proportion of total variation at age 18–39 years of 0.63 (95% CI, 0.53–0.71) and at age 40–65 years of 0.27 (95% CI, 0.10–0.41). The impact of the MTHFR locus is estimated to explain 53% (95% CI, 0.07–0.67) of the total phenotypic variation in persons 18–39 years old and 24% (95% CI, 0.00–0.39) in persons 40–65 years old, i.e., almost all additive genetic variance.
Conclusions: Homocysteine concentrations have a high heritability that decreases with age. The MTHFR gene locus is responsible for almost all the variation attributable to genetic factors, leaving very little influence of other genetic variations.
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Affiliation(s)
- Lise Bathum
- Department of Biochemistry, Pharmacology and Genetics, Odense University Hospital, Odense, Denmark.
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Gene by sex interaction in the etiology of coronary heart disease and the preceding metabolic syndrome. Nutr Metab Cardiovasc Dis 2006; 17:153-61. [PMID: 17306735 DOI: 10.1016/j.numecd.2006.01.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Revised: 01/05/2006] [Accepted: 01/09/2006] [Indexed: 11/24/2022]
Abstract
BACKGROUND Despite decades of research, the genetic basis of coronary heart disease and its metabolic risk factors is poorly understood. Few studies consider that sex may modify the effect of gene variants on disease. Investigation of gene by sex interaction may help to elucidate underlying genetic susceptibilities and explain the sexual dimorphism of these complex traits. AIMS The aim of this review is to summarize evidence for gene by sex interaction in the etiology of coronary heart disease and the metabolic syndrome. DATA SYNTHESIS Published literature was examined in the areas of familial aggregation of coronary heart disease; heritability of body mass, insulin resistance, hypertension and dyslipidemia; genome-wide linkage analysis in humans and rodents; and large-scale genetic association studies. Possible mechanisms of gene by sex interaction are discussed including X-linked inheritance, confounding by risk factors and the effect of sex hormones. CONCLUSIONS The strongest evidence for gene by sex interaction in relation to coronary heart disease and the metabolic syndrome is in the etiology of body mass, insulin resistance and possibly dyslipidemia. Genetic studies of these traits would benefit from taking sex differences into account. Alternative mechanisms underlying gene by sex interaction, besides obvious sex hormone differences, should be considered.
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Abrahamsen B, Hjelmborg JV, Kostenuik P, Stilgren LS, Kyvik K, Adamu S, Brixen K, Langdahl BL. Circulating amounts of osteoprotegerin and RANK ligand: genetic influence and relationship with BMD assessed in female twins. Bone 2005; 36:727-35. [PMID: 15781001 DOI: 10.1016/j.bone.2004.12.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2004] [Revised: 11/17/2004] [Accepted: 12/01/2004] [Indexed: 12/22/2022]
Abstract
UNLABELLED Osteoprotegerin (OPG) is a circulating receptor that inhibits osteoclastogenesis by binding to RANK ligand (RANKL). OPG knock-out animals develop severe osteoporosis. Treatment with OPG lowers bone resorption and increases BMD. OPG production is influenced by a wide range of hormones and cytokines. The influence of genetic factors on circulating amounts of OPG and RANKL is not known. BMD has been demonstrated to have a high heritability and there is evidence also that bone turnover and bone loss rates are controlled at least in part by genetic factors. OBJECTIVE Assessing the genetic impact on serum OPG and RANKL in women and estimation of the relative contribution of this inheritance to the total heritability of BMD. METHODS 188 female twins (52 DZ and 42 MZ pairs) from the Danish Twin Registry were included in the study. Mean age was 35 years (range 19-64 years), average spine BMD was 1.04 +/- 0.11 g/cm2. Serum levels of OPG and RANKL were measured by ELISA (Biomedica, Vienna, Austria). This register covers twins born in Denmark since 1870. Heritability and environmental influence was assessed using a maximum-likelihood model for genetic pleiotropy. RESULTS RANKL levels showed a negative correlation with age and lower values in smokers. OPG levels were higher in postmenopausal women. Heritability (h(2)) was 85% for spine BMD and 52% for serum RANKL after adjustment for age, smoking and BMI. By contrast, there was no significant genetic influence on OPG levels (h(2) = 0, 95% CI: 0 to 0.31). Serum OPG was determined almost exclusively by individual environment (e(2) = 0.79), with a small, non-significant contribution from shared environment (c(2) = 0.21). Restricting analyses to the 158 premenopausal twins did not alter the findings. CONCLUSIONS Serum OPG and RANKL levels have only a weak relation to BMD in healthy women. Phenotype correlations indicate that the genes that contribute to twin similarity for BMD are not genes regulating serum levels of RANKL or OPG. The weak correlation with BMD appears to consist in shared environmental factors.
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Affiliation(s)
- Bo Abrahamsen
- Department of Endocrinology, Odense University Hospital, Denmark.
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Kristiansen M, Knudsen GPS, Bathum L, Naumova AK, Sørensen TIA, Brix TH, Svendsen AJ, Christensen K, Kyvik KO, Ørstavik KH. Twin study of genetic and aging effects on X chromosome inactivation. Eur J Hum Genet 2005; 13:599-606. [PMID: 15756296 DOI: 10.1038/sj.ejhg.5201398] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
To investigate the genetic influence on X chromosome inactivation and on age-related skewing of X inactivation, in particular, we analysed the X inactivation pattern (XIP) in peripheral blood cells from 118 young monozygotic (MZ) twin pairs (18-53 years), 82 elderly MZ twin pairs (55-94 years), 146 young dizygotic (DZ) twin pairs (20-54 years) and 112 elderly DZ twin pairs (64-95 years). Elderly twins had a higher frequency of skewed X inactivation (34%) than young twins (15%) (P<0.001). Our data suggest that the increase in skewing occurs after age 50-60 years. The intraclass correlation was 0.61 and 0.58 in young and elderly MZ twin pairs, and 0.08 and 0.09 in young and elderly DZ twin pairs. Biometric analysis showed that dominant genetic effects accounted for 63 and 58% of the variance of XIP in the young and elderly twin pairs, respectively. The dominant genetic effect and the shared environment for monochorionic MZ twins may explain the high intraclass correlation for the MZ twin pairs compared to the DZ twin pairs. We did not observe a significant decrease in the intraclass correlation in elderly MZ twins compared to young MZ twins, which would be expected if age-related skewing were due to stochastic factors. We conclude that the increased skewing with age implies that a genetically dependent selection of blood cells take place.
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Weiss LA, Abney M, Cook EH, Ober C. Sex-specific genetic architecture of whole blood serotonin levels. Am J Hum Genet 2005; 76:33-41. [PMID: 15526234 PMCID: PMC1196431 DOI: 10.1086/426697] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2004] [Accepted: 10/07/2004] [Indexed: 11/03/2022] Open
Abstract
Recently, a quantitative-trait locus (QTL) for whole blood serotonin level was identified in a genomewide linkage and association study in a founder population. Because serotonin level is a sexually dimorphic trait, in the present study, we evaluated the sex-specific genetic architecture of whole blood serotonin level in the same population. Here, we use an extended homozygosity-by-descent linkage method that is suitable for large complex pedigrees. Although both males and females have high broad heritability (H2=0.99), females have a higher additive component (h2=0.63 in females; h2=0.27 in males). Furthermore, the serotonin QTL on 17q that was identified previously in this population, integrin beta 3 (ITGB3), and a novel locus on 2q influence serotonin levels only in males, whereas linkage to a region on chromosome 6q is specific to females. Both sexes contribute to linkage signals on 12q and 16p. There were, overall, more associations meeting criteria for suggestive significance in males than in females, including those of ITGB3 and the serotonin transporter gene (5HTT). This analysis is consistent with heritable sexual dimorphism in whole blood serotonin levels resulting from the effects of a combination of sex-specific and sex-independent loci.
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Affiliation(s)
- Lauren A. Weiss
- Departments of Human Genetics and Psychiatry, The University of Chicago, Chicago
| | - Mark Abney
- Departments of Human Genetics and Psychiatry, The University of Chicago, Chicago
| | - Edwin H. Cook
- Departments of Human Genetics and Psychiatry, The University of Chicago, Chicago
| | - Carole Ober
- Departments of Human Genetics and Psychiatry, The University of Chicago, Chicago
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