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A trans-ancestral meta-analysis of genome-wide association studies reveals loci associated with childhood obesity.

ABSTRACT: Although hundreds of genome-wide association studies-implicated loci have been reported for adult obesity-related traits, less is known about the genetics specific for early-onset obesity and with only a few studies conducted in non-European populations to date. Searching for additional genetic variants associated with childhood obesity, we performed a trans-ancestral meta-analysis of 30 studies consisting of up to 13?005 cases (?95th percentile of body mass index (BMI) achieved 2-18 years old) and 15?599 controls (consistently <50th percentile of BMI) of European, African, North/South American and East Asian ancestry. Suggestive loci were taken forward for replication in a sample of 1888 cases and 4689 controls from seven cohorts of European and North/South American ancestry. In addition to observing 18 previously implicated BMI or obesity loci, for both early and late onset, we uncovered one completely novel locus in this trans-ancestral analysis (nearest gene, METTL15). The variant was nominally associated with only the European subgroup analysis but had a consistent direction of effect in other ethnicities. We then utilized trans-ancestral Bayesian analysis to narrow down the location of the probable causal variant at each genome-wide significant signal. Of all the fine-mapped loci, we were able to narrow down the causative variant at four known loci to fewer than 10 single nucleotide polymorphisms (SNPs) (FAIM2, GNPDA2, MC4R and SEC16B loci). In conclusion, an ethnically diverse setting has enabled us to both identify an additional pediatric obesity locus and further fine-map existing loci.

SUBMITTER: Bradfield JP

PROVIDER: S-EPMC6859434 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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A trans-ancestral meta-analysis of genome-wide association studies reveals loci associated with childhood obesity.

Bradfield Jonathan P JP Vogelezang Suzanne S Felix Janine F JF Chesi Alessandra A Helgeland Øyvind Ø Horikoshi Momoko M Karhunen Ville V Lowry Estelle E Cousminer Diana L DL Ahluwalia Tarunveer S TS Thiering Elisabeth E Boh Eileen Tai-Hui ET Zafarmand Mohammad H MH Vilor-Tejedor Natalia N Wang Carol A CA Joro Raimo R Chen Zhanghua Z Gauderman William J WJ Pitkänen Niina N Parra Esteban J EJ Fernandez-Rhodes Lindsay L Alyass Akram A Monnereau Claire C Curtin John A JA Have Christian T CT McCormack Shana E SE Hollensted Mette M Frithioff-Bøjsøe Christine C Valladares-Salgado Adan A Peralta-Romero Jesus J Teo Yik-Ying YY Standl Marie M Leinonen Jaakko T JT Holm Jens-Christian JC Peters Triinu T Vioque Jesus J Vrijheid Martine M Simpson Angela A Custovic Adnan A Vaudel Marc M Canouil Mickaël M Lindi Virpi V Atalay Mustafa M Kähönen Mika M Raitakari Olli T OT van Schaik Barbera D C BDC Berkowitz Robert I RI Cole Shelley A SA Voruganti V Saroja VS Wang Yujie Y Highland Heather M HM Comuzzie Anthony G AG Butte Nancy F NF Justice Anne E AE Gahagan Sheila S Blanco Estela E Lehtimäki Terho T Lakka Timo A TA Hebebrand Johannes J Bonnefond Amélie A Grarup Niels N Froguel Philippe P Lyytikäinen Leo-Pekka LP Cruz Miguel M Kobes Sayuko S Hanson Robert L RL Zemel Babette S BS Hinney Anke A Teo Koon K KK Meyre David D North Kari E KE Gilliland Frank D FD Bisgaard Hans H Bustamante Mariona M Bonnelykke Klaus K Pennell Craig E CE Rivadeneira Fernando F Uitterlinden André G AG Baier Leslie J LJ Vrijkotte Tanja G M TGM Heinrich Joachim J Sørensen Thorkild I A TIA Saw Seang-Mei SM Pedersen Oluf O Hansen Torben T Eriksson Johan J Widén Elisabeth E McCarthy Mark I MI Njølstad Pål R PR Power Christine C Hyppönen Elina E Sebert Sylvain S Brown Christopher D CD Järvelin Marjo-Riitta MR Timpson Nicholas J NJ Johansson Stefan S Hakonarson Hakon H Jaddoe Vincent W V VWV Grant S F A SFA

Human molecular genetics 20191001 19

Although hundreds of genome-wide association studies-implicated loci have been reported for adult obesity-related traits, less is known about the genetics specific for early-onset obesity and with only a few studies conducted in non-European populations to date. Searching for additional genetic variants associated with childhood obesity, we performed a trans-ancestral meta-analysis of 30 studies consisting of up to 13 005 cases (≥95th percentile of body mass index (BMI) achieved 2-18 years old) ...[more]

PMID: 31504550

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Project description:OBJECTIVE:Large-scale genome-wide association (GWA) studies have thus far identified 16 loci incontrovertibly associated with obesity-related traits in adults. We examined associations of variants in these loci with anthropometric traits in children and adolescents. RESEARCH DESIGN AND METHODS:Seventeen variants representing 16 obesity susceptibility loci were genotyped in 1,252 children (mean ± SD age 9.7 ± 0.4 years) and 790 adolescents (15.5 ± 0.5 years) from the European Youth Heart Study (EYHS). We tested for association of individual variants and a genetic predisposition score (GPS-17), calculated by summing the number of effect alleles, with anthropometric traits. For 13 variants, summary statistics for associations with BMI were meta-analyzed with previously reported data (N(total) = 13,071 children and adolescents). RESULTS:In EYHS, 15 variants showed associations or trends with anthropometric traits that were directionally consistent with earlier reports in adults. The meta-analysis showed directionally consistent associations with BMI for all 13 variants, of which 9 were significant (0.033-0.098 SD/allele; P < 0.05). The near-TMEM18 variant had the strongest effect (0.098 SD/allele P = 8.5 × 10(-11)). Effect sizes for BMI tended to be more pronounced in children and adolescents than reported earlier in adults for variants in or near SEC16B, TMEM18, and KCTD15, (0.028-0.035 SD/allele higher) and less pronounced for rs925946 in BDNF (0.028 SD/allele lower). Each additional effect allele in the GPS-17 was associated with an increase of 0.034 SD in BMI (P = 3.6 × 10(-5)), 0.039 SD, in sum of skinfolds (P = 1.7 × 10(-7)), and 0.022 SD in waist circumference (P = 1.7 × 10(-4)), which is comparable with reported results in adults (0.039 SD/allele for BMI and 0.033 SD/allele for waist circumference). CONCLUSIONS:Most obesity susceptibility loci identified by GWA studies in adults are already associated with anthropometric traits in children/adolescents. Whereas the association of some variants may differ with age, the cumulative effect size is similar.

Project description:BackgroundCirculating trans fatty acids (TFAs), which cannot be synthesized by humans, are linked to adverse health outcomes. Although TFAs are obtained from diet, little is known about subsequent influences (e.g., relating to incorporation, metabolism, or intercompetition with other fatty acids) that could alter circulating concentrations and possibly modulate or mediate impacts on health.ObjectiveThe objective was to elucidate novel biologic pathways that may influence circulating TFAs by evaluating associations between common genetic variation and TFA biomarkers.DesignWe performed meta-analyses using 7 cohorts of European-ancestry participants (n = 8013) having measured genome-wide variation in single-nucleotide polymorphisms (SNPs) and circulating TFA biomarkers (erythrocyte or plasma phospholipids), including trans-16:1n-7, total trans-18:1, trans/cis-18:2, cis/trans-18:2, and trans/trans-18:2. We further evaluated SNPs with genome-wide significant associations among African Americans (n = 1082), Chinese Americans (n = 669), and Hispanic Americans (n = 657) from 2 of these cohorts.ResultsAmong European-ancestry participants, 31 SNPs in or near the fatty acid desaturase (FADS) 1 and 2 cluster were associated with cis/trans-18:2; a top hit was rs174548 (β = 0.0035, P = 4.90 × 10(-15)), an SNP previously associated with circulating n-3 and n-6 polyunsaturated fatty acid concentrations. No significant association was identified for other TFAs. rs174548 in FADS1/2 was also associated with cis/trans-18:2 in Hispanic Americans (β = 0.0053, P = 1.05 × 10(-6)) and Chinese Americans (β = 0.0028, P = 0.002) but not African Americans (β = 0.0009, P = 0.34); however, in African Americans, fine mapping identified a top hit in FADS2 associated with cis/trans-18:2 (rs174579: β = 0.0118, P = 4.05 × 10(-5)). The association between rs174548 and cis/trans-18:2 remained significant after further adjustment for individual circulating n-3 and n-6 fatty acids, except arachidonic acid. After adjustment for arachidonic acid concentrations, the association between rs174548 and cis/trans-18:2 was nearly eliminated in European-ancestry participants (β-coefficient reduced by 86%), with similar reductions in Hispanic Americans and Chinese Americans.ConclusionsOur findings provide novel evidence for genetic regulation of cis/trans-18:2 by the FADS1/2 cluster and suggest that this regulation may be influenced/mediated by concentrations of arachidonic acid, an n-6 polyunsaturated fat.

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A trans-ancestral meta-analysis of genome-wide association studies reveals loci associated with childhood obesity.

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A trans-ancestral meta-analysis of genome-wide association studies reveals loci associated with childhood obesity.

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