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Shungin, Dmitry
Publications (10 of 34) Show all publications
Sofer, T., Zheng, X., Gogarten, S. M., Laurie, C. A., Grinde, K., Shaffer, J. R., . . . Rice, K. M. (2019). A fully adjusted two-stage procedure for rank-normalization in genetic association studies. Genetic Epidemiology, 43(3), 263-275
Open this publication in new window or tab >>A fully adjusted two-stage procedure for rank-normalization in genetic association studies
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2019 (English)In: Genetic Epidemiology, ISSN 0741-0395, E-ISSN 1098-2272, Vol. 43, no 3, p. 263-275Article in journal (Refereed) Published
Abstract [en]

When testing genotype–phenotype associations using linear regression, departure of the trait distribution from normality can impact both Type I error rate control and statistical power, with worse consequences for rarer variants. Because genotypes are expected to have small effects (if any) investigators now routinely use a two‐stage method, in which they first regress the trait on covariates, obtain residuals, rank‐normalize them, and then use the rank‐normalized residuals in association analysis with the genotypes. Potential confounding signals are assumed to be removed at the first stage, so in practice, no further adjustment is done in the second stage. Here, we show that this widely used approach can lead to tests with undesirable statistical properties, due to both combination of a mis‐specified mean–variance relationship and remaining covariate associations between the rank‐normalized residuals and genotypes. We demonstrate these properties theoretically, and also in applications to genome‐wide and whole‐genome sequencing association studies. We further propose and evaluate an alternative fully adjusted two‐stage approach that adjusts for covariates both when residuals are obtained and in the subsequent association test. This method can reduce excess Type I errors and improve statistical power.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
rank-normalization, rare variants, whole-genome sequencing
National Category
Medical Genetics
Identifiers
urn:nbn:se:umu:diva-157743 (URN)10.1002/gepi.22188 (DOI)000461058300003 ()30653739 (PubMedID)2-s2.0-85060217416 (Scopus ID)
Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2019-04-09Bibliographically approved
Shungin, D., Hawort, S., Divaris, K., Agler, C. S., Kamatani, Y., Lee, M. K., . . . Johansson, I. (2019). Genome-wide analysis of dental caries and periodontitis combining clinical and self-reported data. Nature Communications, 10, Article ID 2773.
Open this publication in new window or tab >>Genome-wide analysis of dental caries and periodontitis combining clinical and self-reported data
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 2773Article in journal (Refereed) Published
Abstract [en]

Dental caries and periodontitis account for a vast burden of morbidity and healthcare spending, yet their genetic basis remains largely uncharacterized. Here, we identify self-reported dental disease proxies which have similar underlying genetic contributions to clinical disease measures and then combine these in a genome-wide association study meta-analysis, identifying 47 novel and conditionally-independent risk loci for dental caries. We show that the heritability of dental caries is enriched for conserved genomic regions and partially overlapping with a range of complex traits including smoking, education, personality traits and metabolic measures. Using cardio-metabolic traits as an example in Mendelian randomization analysis, we estimate causal relationships and provide evidence suggesting that the processes contributing to dental caries may have undesirable downstream effects on health.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Dentistry
Identifiers
urn:nbn:se:umu:diva-161588 (URN)10.1038/s41467-019-10630-1 (DOI)000472598400005 ()31235808 (PubMedID)
Available from: 2019-07-22 Created: 2019-07-22 Last updated: 2019-07-22Bibliographically approved
Lloyd-Price, J., Arze, C., Ananthakrishnan, A. N., Schirmer, M., Avila-Pacheco, J., Poon, T. W., . . . Yajnik, V. (2019). Multi-omics of the gut microbial ecosystem in inflammatory bowel diseases. Nature, 569(7758), 655-661
Open this publication in new window or tab >>Multi-omics of the gut microbial ecosystem in inflammatory bowel diseases
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2019 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 569, no 7758, p. 655-661Article in journal (Refereed) Published
Abstract [en]

Inflammatory bowel diseases, which include Crohn's disease and ulcerative colitis, affect several million individuals worldwide. Crohn's disease and ulcerative colitis are complex diseases that are heterogeneous at the clinical, immunological, molecular, genetic, and microbial levels. Individual contributing factors have been the focus of extensive research. As part of the Integrative Human Microbiome Project (HMP2 or iHMP), we followed 132 subjects for one year each to generate integrated longitudinal molecular profiles of host and microbial activity during disease (up to 24 time points each; in total 2,965 stool, biopsy, and blood specimens). Here we present the results, which provide a comprehensive view of functional dysbiosis in the gut microbiome during inflammatory bowel disease activity. We demonstrate a characteristic increase in facultative anaerobes at the expense of obligate anaerobes, as well as molecular disruptions in microbial transcription (for example, among clostridia), metabolite pools (acylcarnitines, bile acids, and short-chain fatty acids), and levels of antibodies in host serum. Periods of disease activity were also marked by increases in temporal variability, with characteristic taxonomic, functional, and biochemical shifts. Finally, integrative analysis identified microbial, biochemical, and host factors central to this dysregulation. The study's infrastructure resources, results, and data, which are available through the Inflammatory Bowel Disease Multi'omics Database (http://ibdmdb.org), provide the most comprehensive description to date of host and microbial activities in inflammatory bowel diseases.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Gastroenterology and Hepatology
Identifiers
urn:nbn:se:umu:diva-160609 (URN)10.1038/s41586-019-1237-9 (DOI)000470144100033 ()31142855 (PubMedID)
Funder
NIH (National Institute of Health), P01DK046763NIH (National Institute of Health), U01DK062413NIH (National Institute of Health), U54DK102557NIH (National Institute of Health), UL1TR001881NIH (National Institute of Health), P30DK043351NIH (National Institute of Health), R24DK110499NIH (National Institute of Health), R01HG005969NIH (National Institute of Health), U54DE023798
Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-06-24Bibliographically approved
Haworth, S., Shungin, D., van der Tas, J. T., Vucic, S., Medina-Gomez, C., Yakimov, V., . . . Timpson, N. J. (2018). Consortium-based genome-wide meta-analysis for childhood dental caries traits. Human Molecular Genetics, 27(17), 3113-3127
Open this publication in new window or tab >>Consortium-based genome-wide meta-analysis for childhood dental caries traits
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2018 (English)In: Human Molecular Genetics, ISSN 0964-6906, E-ISSN 1460-2083, Vol. 27, no 17, p. 3113-3127Article in journal (Refereed) Published
Abstract [en]

Prior studies suggest dental caries traits in children and adolescents are partially heritable, but there has been no large-scale consortium genome-wide association study (GWAS) to date. We therefore performed GWAS for caries in participants aged 2.5-18.0 years from nine contributing centres. Phenotype definitions were created for the presence or absence of treated or untreated caries, stratified by primary and permanent dentition. All studies tested for association between caries and genotype dosage and the results were combined using fixed-effects meta-analysis. Analysis included up to 19 003 individuals (7530 affected) for primary teeth and 13 353 individuals (5875 affected) for permanent teeth. Evidence for association with caries status was observed at rs1594318-C for primary teeth [intronic within ALLC, odds ratio (OR) 0.85, effect allele frequency (EAF) 0.60, P 4.13e-8] and rs7738851-A (intronic within NEDD9, OR 1.28, EAF 0.85, P 1.63e-8) for permanent teeth. Consortium-wide estimated heritability of caries was low [h2 of 1% (95% CI: 0%: 7%) and 6% (95% CI 0%: 13%) for primary and permanent dentitions, respectively] compared with corresponding within-study estimates [h2 of 28% (95% CI: 9%: 48%) and 17% (95% CI: 2%: 31%)] or previously published estimates. This study was designed to identify common genetic variants with modest effects which are consistent across different populations. We found few single variants associated with caries status under these assumptions. Phenotypic heterogeneity between cohorts and limited statistical power will have contributed; these findings could also reflect complexity not captured by our study design, such as genetic effects which are conditional on environmental exposure.

Place, publisher, year, edition, pages
Oxford University Press, 2018
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:umu:diva-151020 (URN)10.1093/hmg/ddy237 (DOI)000444202300012 ()29931343 (PubMedID)
Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2019-05-17Bibliographically approved
Haworth, S., Shungin, D., Kwak, S. Y., Kim, H.-Y., West, N. X., Thomas, S. J., . . . Johansson, I. (2018). Tooth loss is a complex measure of oral disease: determinants and methodological considerations. Community Dentistry and Oral Epidemiology, 46(6), 555-562
Open this publication in new window or tab >>Tooth loss is a complex measure of oral disease: determinants and methodological considerations
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2018 (English)In: Community Dentistry and Oral Epidemiology, ISSN 0301-5661, E-ISSN 1600-0528, Vol. 46, no 6, p. 555-562Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: Counts of missing teeth or measures of incident tooth loss are gaining attention as a simple way to measure dental status in large population studies. We explore the meaning of these metrics and how missing teeth might influence other measures of dental status.

METHODS: An observational study was performed in 2 contrasting adult populations. In total, 62 522 adult participants were available with clinically assessed caries and periodontal indices from the Swedish arm of the Gene-Lifestyle Interactions and Dental Endpoints Study (GLIDE) and the Korea National Health and Nutrition Examination Survey (KNHANES) in the Republic of Korea. Longitudinal measures of tooth loss were available for 28 244 participants in GLIDE with median follow-up of 10.6 years.

RESULTS: In longitudinal analysis, hazard for tooth loss was associated with baseline dental status (previous tooth loss, periodontal status and caries status) and socio-demographic variables (age, smoking status and highest educational level). Analysis of cross-sectional data suggested that indices of caries exposure were not independent of periodontal status. The strength and direction of association varied between groups, even for measures specifically intended to avoid measuring tooth loss. Individuals with impaired periodontal health (community periodontal index [CPI] 3 or higher in any sextant) had higher standardized decayed and filled surfaces (DFS; number of DFS divided by total number of tooth surfaces) in GLIDE (incidence risk ratio [IRR] 1.05 [95% CI: 1.04, 1.07], but lower standardized DFS in KNHANES (IRR: 0.95 [0.92, 0.98]) than individuals with better periodontal health (CPI <3 in all sextants).

CONCLUSIONS: Incident tooth loss is a complex measure of dental disease, with multiple determinants. The relative importance of dental caries and periodontal disease as drivers of tooth loss differs between age groups. Measures of dental caries exposure are associated with periodontal status in the studied populations, and these associations can be population-specific. Consideration of the study-specific properties of these metrics may be required for valid inference in large population studies.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
Keywords
caries, epidemiology, periodontal diseases, tooth loss
National Category
Public Health, Global Health, Social Medicine and Epidemiology Dentistry
Identifiers
urn:nbn:se:umu:diva-151017 (URN)10.1111/cdoe.12391 (DOI)000450235300004 ()29956852 (PubMedID)2-s2.0-85056452429 (Scopus ID)
Funder
Västerbotten County CouncilSwedish Research Council, 2015-02597Swedish Research Council, 2011-3372
Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2019-05-23Bibliographically approved
Tognon, G., Nilsson, L. M., Shungin, D., Lissner, L., Jansson, J.-H., Renstrom, F., . . . Johansson, I. (2017). Nonfermented milk and other dairy products: associations with all-cause mortality 1,2. American Journal of Clinical Nutrition, 105(6), 1502-1511
Open this publication in new window or tab >>Nonfermented milk and other dairy products: associations with all-cause mortality 1,2
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2017 (English)In: American Journal of Clinical Nutrition, ISSN 0002-9165, E-ISSN 1938-3207, Vol. 105, no 6, p. 1502-1511Article in journal (Refereed) Published
Abstract [en]

Background: A positive association between nonfermented milk intake and increased all-cause mortality was recently reported, but overall, the association between dairy intake and mortality is inconclusive. Objective: We studied associations between intake of dairy products and all-cause mortality with an emphasis on nonfermented milk and fat content. Design: A total of 103,256 adult participants (women: 51.0%) from Northern Sweden were included (7121 deaths; mean follow-up: 13.7 y). Associations between all-cause mortality and reported intakes of nonfermented milk (total or by fat content), fermented milk, cheese, and butter were tested with the use of Cox proportional hazards models that were adjusted for age, sex, body mass index, smoking status, education, energy intake, examination year, and physical activity. To circumvent confounding, Mendelian randomization was applied in a subsample via the lactase LCT-13910 C/T single nucleotide polymorphism that is associated with lactose tolerance and milk intake. Results: High consumers of nonfermented milk (>= 2.5 times/d) had a 32% increased hazard (HR: 1.32; 95% CI: 1.18, 1.48) for all-cause mortality compared with that of subjects who consumed milk <= 1 time/wk. The corresponding value for butter was 11% (HR: 1.11; 95% CI: 1.07, 1.21). All nonfermented milk-fat types were independently associated with increased HRs, but compared with full-fat milk, HRs were lower in consumers of medium-and low-fat milk. Fermented milk intake (HR: 0.90; 95% CI: 0.86, 0.94) and cheese intake (HR: 0.93; 95% CI: 0.91, 0.96) were negatively associated with mortality. Results were slightly attenuated by lifestyle adjustments but were robust in sensitivity analyses. Mortality was not significantly associated with the LCT-13910 C/T genotype in the smaller subsample. The amount and type of milk intake was associated with lifestyle variables. Conclusions: In the present Swedish cohort study, intakes of nonfermented milk and butter are associated with higher all-cause mortality, and fermented milk and cheese intakes are associated with lower all-cause mortality. Residual confounding by lifestyle cannot be excluded, and Mendelian randomization needs to be examined in a larger sample.

Place, publisher, year, edition, pages
AMER SOC NUTRITION-ASN, 2017
Keywords
all-cause mortality, butter, cheese, dairy products, fermented dairy products, fermented milk, milk, nfermented milk
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:umu:diva-137052 (URN)10.3945/ajcn.116.140798 (DOI)000402612200030 ()28490510 (PubMedID)
Available from: 2017-06-28 Created: 2017-06-28 Last updated: 2018-06-09Bibliographically approved
Varga, T. V., Kurbasic, A., Aine, M., Eriksson, P., Ali, A., Hindy, G., . . . Franks, P. W. (2017). Novel genetic loci associated with long-term deterioration in blood lipid concentrations and coronary artery disease in European adults. International Journal of Epidemiology, 46(4), 1211-1222
Open this publication in new window or tab >>Novel genetic loci associated with long-term deterioration in blood lipid concentrations and coronary artery disease in European adults
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2017 (English)In: International Journal of Epidemiology, ISSN 0300-5771, E-ISSN 1464-3685, Vol. 46, no 4, p. 1211-1222Article in journal (Refereed) Published
Abstract [en]

Background: Cross-sectional genome-wide association studies have identified hundreds of loci associated with blood lipids and related cardiovascular traits, but few genetic association studies have focused on long-term changes in blood lipids. Methods: Participants from the GLACIER Study (N-max = 3492) were genotyped with the MetaboChip array, from which 29 387 SNPs (single nucleotide polymorphisms;replication, fine-mapping regions and wildcard SNPs for lipid traits) were extracted for association tests with 10-year change in total cholesterol (Delta TC) and triglycerides (Delta TG). Four additional prospective cohort studies (MDC, PIVUS, ULSAM, MRC Ely; N-max = 8263 participants) were used for replication. We conducted an in silico look-up for association with coronary artery disease (CAD) in the Coronary ARtery DIsease Genome-wide Replication and Meta-analysis (CARDIoGRAMplusC4D) Consortium (N similar to 190 000) and functional annotation for the top ranking variants. Results: In total, 956 variants were associated (P < 0.01) with either Delta TC or Delta TG in GLACIER. In GLACIER, chr19:50121999 at APOE was associated with Delta TG and multiple SNPs in the APOA1/A4/C3/A5 region at genome-wide significance (P < 5 x 10(-8)), whereas variants in four loci, DOCK7, BRE, SYNE1 and KCNIP1, reached study-wide significance (P < 1.7 x 10(-6)). The rs7412 variant at APOE was associated with DTC in GLACIER (P < 1.7 x 10(-6)). In pooled analyses of all cohorts, 139 SNPs at six and five loci were associated with Delta TC and for Delta TG, respectively (P < 10(-3)). Of these, a variant at CAPN3 (P = 1.2 x 10(-4)), multiple variants at HPR (P-min = 1.5 x 10(-6)) and a variant at SIX5 (P = 1.9 x 10(-4)) showed evidence for association with CAD. Conclusions: We identified seven novel genomic regions associated with long-term changes in blood lipids, of which three also raise CAD risk.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS, 2017
Keywords
Prospective cohort study, longitudinal analysis, total cholesterol, morbidity, triglycerides, single cleotide polymorphism, genetic epidemiology
National Category
Cardiac and Cardiovascular Systems
Identifiers
urn:nbn:se:umu:diva-140479 (URN)10.1093/ije/dyw245 (DOI)000411078800023 ()27864399 (PubMedID)
Available from: 2017-10-23 Created: 2017-10-23 Last updated: 2018-06-09Bibliographically approved
Shungin, D., Deng, W. Q., Varga, T. V., Luan, J., Mihailov, E., Metspalu, A., . . . Franks, P. W. (2017). Ranking and characterization of established BMI and lipid associated loci as candidates for gene-environment interactions. PLoS Genetics, 13(6), Article ID e1006812.
Open this publication in new window or tab >>Ranking and characterization of established BMI and lipid associated loci as candidates for gene-environment interactions
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2017 (English)In: PLoS Genetics, ISSN 1553-7390, E-ISSN 1553-7404, Vol. 13, no 6, article id e1006812Article in journal (Refereed) Published
Abstract [en]

Phenotypic variance heterogeneity across genotypes at a single nucleotide polymorphism (SNP) may reflect underlying gene-environment (GxE) or gene-gene interactions. We modeled variance heterogeneity for blood lipids and BMI in up to 44,211 participants and investigated relationships between variance effects (P-v), GxE interaction effects (with smoking and physical activity), and marginal genetic effects (P-m). Correlations between P-v and P-m were stronger for SNPs with established marginal effects (Spearman's rho = 0.401 for triglycerides, and rho = 0.236 for BMI) compared to all SNPs. When P-v and P-m were compared for all pruned SNPs, only BMI was statistically significant (Spearman's rho = 0.010). Overall, SNPs with established marginal effects were overrepresented in the nominally significant part of the P-v distribution (P-binomial < 0.05). SNPs from the top 1% of the P-m distribution for BMI had more significant P-v values (Pmann-Whitney = 1.46x10(-5)), and the odds ratio of SNPs with nominally significant (< 0.05) P-m and P-v was 1.33 (95% CI: 1.12, 1.57) for BMI. Moreover, BMI SNPs with nominally significant GxE interaction P-values (Pint < 0.05) were enriched with nominally significant P-v values (P-binomial = 8.63x10(-9) and 8.52x10(-7) for SNP x smoking and SNP x physical activity, respectively). We conclude that some loci with strong marginal effects may be good candidates for GxE, and variance-based prioritization can be used to identify them.

Place, publisher, year, edition, pages
Public Library Science, 2017
National Category
Medical Genetics Genetics
Identifiers
urn:nbn:se:umu:diva-140239 (URN)10.1371/journal.pgen.1006812 (DOI)000404512600010 ()28614350 (PubMedID)
Available from: 2017-10-20 Created: 2017-10-20 Last updated: 2018-08-31Bibliographically approved
Ahmad, S., Zhao, W., Renström, F., Rasheed, A., Zaidi, M., Samuel, M., . . . Saleheen, D. (2016). A novel interaction between theFLJ33534locus and smokingin obesity: a genome-wide study of 14 131 Pakistani adults. International Journal of Obesity, 40(1), 186-190
Open this publication in new window or tab >>A novel interaction between theFLJ33534locus and smokingin obesity: a genome-wide study of 14 131 Pakistani adults
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2016 (English)In: International Journal of Obesity, ISSN 0307-0565, E-ISSN 1476-5497, Vol. 40, no 1, p. 186-190Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Obesity is a complex disease caused by the interplay of genetic and lifestyle factors, but identification of gene-lifestyle interactions in obesity has remained challenging. Few large-scale studies have reported use of genome-wide approaches to investigate gene-lifestyle interactions in obesity. METHODS: In the Pakistan Risk of Myocardial Infraction Study, a cross-sectional study based in Pakistan, we calculated body mass index (BMI) variance estimates (square of the residual of inverse-normal transformed BMI z-score) in 14 131 participants and conducted genome-wide heterogeneity of variance analyses (GWHVA) for this outcome. All analyses were adjusted for age, age(2), sex and genetic ancestry. RESULTS: The GWHVA analyses identified an intronic variant, rs140133294, in the FLJ33544 gene in association with BMI variance (P-value = 3.1 x 10(-8)). In explicit tests of gene x lifestyle interaction, smoking was found to significantly modify the effect of rs140133294 on BMI (Pinteraction = 0.0005), whereby the minor allele (T) was associated with lower BMI in current smokers, while positively associated with BMI in never smokers. Analyses of ENCODE data at the FLJ33534 locus revealed features indicative of open chromatin and high confidence DNA-binding motifs for several transcription factors, providing suggestive biological support for a mechanism of interaction. CONCLUSIONS: In summary, we have identified a novel interaction between smoking and variation at the FLJ33534 locus in relation to BMI in people from Pakistan.

National Category
Genetics
Identifiers
urn:nbn:se:umu:diva-114898 (URN)10.1038/ijo.2015.152 (DOI)000367628700027 ()26278006 (PubMedID)
Available from: 2016-04-15 Created: 2016-01-29 Last updated: 2018-06-07Bibliographically approved
Ahmad, S., Poveda, A., Shungin, D., Barroso, I., Hallmans, G., Renström, F. & Franks, P. W. (2016). Established BMI-associated genetic variants and their prospective associations with BMI and other cardiometabolic traits: the GLACIER Study. International Journal of Obesity, 40(9), 1346-1352
Open this publication in new window or tab >>Established BMI-associated genetic variants and their prospective associations with BMI and other cardiometabolic traits: the GLACIER Study
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2016 (English)In: International Journal of Obesity, ISSN 0307-0565, E-ISSN 1476-5497, Vol. 40, no 9, p. 1346-1352Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Recent cross-sectional genome-wide scans have reported associations of 97 independent loci with body mass index (BMI). In 3541 middle-aged adult participants from the GLACIER Study, we tested whether these loci are associated with 10-year changes in BMI and other cardiometabolic traits (fasting and 2-h glucose, triglycerides, total cholesterol, and systolic and diastolic blood pressures).

METHODS: A BMI-specific genetic risk score (GRS) was calculated by summing the BMI-associated effect alleles at each locus. Trait-specific cardiometabolic GRSs comprised only the loci that show nominal association (P⩽0.10) with the respective trait in the original cross-sectional study. In longitudinal genetic association analyses, the second visit trait measure (assessed ~10 years after baseline) was used as the dependent variable and the models were adjusted for the baseline measure of the outcome trait, age, age(2), fasting time (for glucose and lipid traits), sex, follow-up time and population substructure.

RESULTS: The BMI-specific GRS was associated with increased BMI at follow-up (β=0.014 kg m(-2) per allele per 10-year follow-up, s.e.=0.006, P=0.019) as were three loci (PARK2 rs13191362, P=0.005; C6orf106 rs205262, P=0.043; and C9orf93 rs4740619, P=0.01). Although not withstanding Bonferroni correction, a handful of single-nucleotide polymorphisms was nominally associated with changes in blood pressure, glucose and lipid levels.

CONCLUSIONS: Collectively, established BMI-associated loci convey modest but statistically significant time-dependent associations with long-term changes in BMI, suggesting a role for effect modification by factors that change with time in this population.

Place, publisher, year, edition, pages
Nature Publishing Group, 2016
National Category
Endocrinology and Diabetes Nutrition and Dietetics
Identifiers
urn:nbn:se:umu:diva-122087 (URN)10.1038/ijo.2016.72 (DOI)000383781100003 ()27121252 (PubMedID)
Available from: 2016-06-15 Created: 2016-06-15 Last updated: 2018-08-31Bibliographically approved
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