TY - JOUR T1 - Trans-ethnic fine-mapping of genetic loci for body mass index in the diverse ancestral populations of the Population Architecture using Genomics and Epidemiology (PAGE) Study reveals evidence for multiple signals at established loci. JF - Hum Genet Y1 - 2017 A1 - Fernandez-Rhodes, Lindsay A1 - Gong, Jian A1 - Haessler, Jeffrey A1 - Franceschini, Nora A1 - Graff, Mariaelisa A1 - Nishimura, Katherine K A1 - Wang, Yujie A1 - Highland, Heather M A1 - Yoneyama, Sachiko A1 - Bush, William S A1 - Goodloe, Robert A1 - Ritchie, Marylyn D A1 - Crawford, Dana A1 - Gross, Myron A1 - Fornage, Myriam A1 - Bůzková, Petra A1 - Tao, Ran A1 - Isasi, Carmen A1 - Avilés-Santa, Larissa A1 - Daviglus, Martha A1 - Mackey, Rachel H A1 - Houston, Denise A1 - Gu, C Charles A1 - Ehret, Georg A1 - Nguyen, Khanh-Dung H A1 - Lewis, Cora E A1 - Leppert, Mark A1 - Irvin, Marguerite R A1 - Lim, Unhee A1 - Haiman, Christopher A A1 - Le Marchand, Loïc A1 - Schumacher, Fredrick A1 - Wilkens, Lynne A1 - Lu, Yingchang A1 - Bottinger, Erwin P A1 - Loos, Ruth J L A1 - Sheu, Wayne H-H A1 - Guo, Xiuqing A1 - Lee, Wen-Jane A1 - Hai, Yang A1 - Hung, Yi-Jen A1 - Absher, Devin A1 - Wu, I-Chien A1 - Taylor, Kent D A1 - Lee, I-Te A1 - Liu, Yeheng A1 - Wang, Tzung-Dau A1 - Quertermous, Thomas A1 - Juang, Jyh-Ming J A1 - Rotter, Jerome I A1 - Assimes, Themistocles A1 - Hsiung, Chao A A1 - Chen, Yii-Der Ida A1 - Prentice, Ross A1 - Kuller, Lewis H A1 - Manson, JoAnn E A1 - Kooperberg, Charles A1 - Smokowski, Paul A1 - Robinson, Whitney R A1 - Gordon-Larsen, Penny A1 - Li, Rongling A1 - Hindorff, Lucia A1 - Buyske, Steven A1 - Matise, Tara C A1 - Peters, Ulrike A1 - North, Kari E KW - Body Mass Index KW - Ethnic Groups KW - Genetics, Population KW - Humans KW - Obesity AB -

Most body mass index (BMI) genetic loci have been identified in studies of primarily European ancestries. The effect of these loci in other racial/ethnic groups is less clear. Thus, we aimed to characterize the generalizability of 170 established BMI variants, or their proxies, to diverse US populations and trans-ethnically fine-map 36 BMI loci using a sample of >102,000 adults of African, Hispanic/Latino, Asian, European and American Indian/Alaskan Native descent from the Population Architecture using Genomics and Epidemiology Study. We performed linear regression of the natural log of BMI (18.5-70 kg/m(2)) on the additive single nucleotide polymorphisms (SNPs) at BMI loci on the MetaboChip (Illumina, Inc.), adjusting for age, sex, population stratification, study site, or relatedness. We then performed fixed-effect meta-analyses and a Bayesian trans-ethnic meta-analysis to empirically cluster by allele frequency differences. Finally, we approximated conditional and joint associations to test for the presence of secondary signals. We noted directional consistency with the previously reported risk alleles beyond what would have been expected by chance (binomial p < 0.05). Nearly, a quarter of the previously described BMI index SNPs and 29 of 36 densely-genotyped BMI loci on the MetaboChip replicated/generalized in trans-ethnic analyses. We observed multiple signals at nine loci, including the description of seven loci with novel multiple signals. This study supports the generalization of most common genetic loci to diverse ancestral populations and emphasizes the importance of dense multiethnic genomic data in refining the functional variation at genetic loci of interest and describing several loci with multiple underlying genetic variants.

VL - 136 IS - 6 ER -