White blood cell (WBC) count is a common clinical measure used as a predictor of certain aspects of human health, including immunity and infection status. WBC count is also a complex trait that varies among individuals and ancestry groups. Differences in linkage disequilibrium structure and heterogeneity in allelic effects are expected to play a role in the associations observed between populations. Prior genome-wide association study (GWAS) meta-analyses have identified genomic loci associated with WBC and its subtypes, but much of the heritability of these phenotypes remains unexplained. Using GWAS summary statistics for over 50 000 individuals from three diverse populations (Japanese, African-American and European ancestry), a Bayesian model methodology was employed to account for heterogeneity between ancestry groups. This approach was used to perform a trans-ethnic meta-analysis of total WBC, neutrophil and monocyte counts. Ten previously known associations were replicated and six new loci were identified, including several regions harboring genes related to inflammation and immune cell function. Ninety-five percent credible interval regions were calculated to narrow the association signals and fine-map the putatively causal variants within loci. Finally, a conditional analysis was performed on the most significant SNPs identified by the trans-ethnic meta-analysis (MA), and nine secondary signals within loci previously associated with WBC or its subtypes were identified. This work illustrates the potential of trans-ethnic analysis and ascribes a critical role to multi-ethnic cohorts and consortia in exploring complex phenotypes with respect to variants that lie outside the European-biased GWAS pool.

VL - 23 IS - 25 U1 - http://www.ncbi.nlm.nih.gov/pubmed/25096241?dopt=Abstract ER - TY - JOUR T1 - A meta-analysis of 120 246 individuals identifies 18 new loci for fibrinogen concentration. JF - Hum Mol Genet Y1 - 2016 A1 - de Vries, Paul S A1 - Chasman, Daniel I A1 - Sabater-Lleal, Maria A1 - Chen, Ming-Huei A1 - Huffman, Jennifer E A1 - Steri, Maristella A1 - Tang, Weihong A1 - Teumer, Alexander A1 - Marioni, Riccardo E A1 - Grossmann, Vera A1 - Hottenga, Jouke J A1 - Trompet, Stella A1 - Müller-Nurasyid, Martina A1 - Zhao, Jing Hua A1 - Brody, Jennifer A A1 - Kleber, Marcus E A1 - Guo, Xiuqing A1 - Wang, Jie Jin A1 - Auer, Paul L A1 - Attia, John R A1 - Yanek, Lisa R A1 - Ahluwalia, Tarunveer S A1 - Lahti, Jari A1 - Venturini, Cristina A1 - Tanaka, Toshiko A1 - Bielak, Lawrence F A1 - Joshi, Peter K A1 - Rocanin-Arjo, Ares A1 - Kolcic, Ivana A1 - Navarro, Pau A1 - Rose, Lynda M A1 - Oldmeadow, Christopher A1 - Riess, Helene A1 - Mazur, Johanna A1 - Basu, Saonli A1 - Goel, Anuj A1 - Yang, Qiong A1 - Ghanbari, Mohsen A1 - Willemsen, Gonneke A1 - Rumley, Ann A1 - Fiorillo, Edoardo A1 - de Craen, Anton J M A1 - Grotevendt, Anne A1 - Scott, Robert A1 - Taylor, Kent D A1 - Delgado, Graciela E A1 - Yao, Jie A1 - Kifley, Annette A1 - Kooperberg, Charles A1 - Qayyum, Rehan A1 - Lopez, Lorna M A1 - Berentzen, Tina L A1 - Räikkönen, Katri A1 - Mangino, Massimo A1 - Bandinelli, Stefania A1 - Peyser, Patricia A A1 - Wild, Sarah A1 - Trégouët, David-Alexandre A1 - Wright, Alan F A1 - Marten, Jonathan A1 - Zemunik, Tatijana A1 - Morrison, Alanna C A1 - Sennblad, Bengt A1 - Tofler, Geoffrey A1 - de Maat, Moniek P M A1 - de Geus, Eco J C A1 - Lowe, Gordon D A1 - Zoledziewska, Magdalena A1 - Sattar, Naveed A1 - Binder, Harald A1 - Völker, Uwe A1 - Waldenberger, Melanie A1 - Khaw, Kay-Tee A1 - McKnight, Barbara A1 - Huang, Jie A1 - Jenny, Nancy S A1 - Holliday, Elizabeth G A1 - Qi, Lihong A1 - Mcevoy, Mark G A1 - Becker, Diane M A1 - Starr, John M A1 - Sarin, Antti-Pekka A1 - Hysi, Pirro G A1 - Hernandez, Dena G A1 - Jhun, Min A A1 - Campbell, Harry A1 - Hamsten, Anders A1 - Rivadeneira, Fernando A1 - McArdle, Wendy L A1 - Slagboom, P Eline A1 - Zeller, Tanja A1 - Koenig, Wolfgang A1 - Psaty, Bruce M A1 - Haritunians, Talin A1 - Liu, Jingmin A1 - Palotie, Aarno A1 - Uitterlinden, André G A1 - Stott, David J A1 - Hofman, Albert A1 - Franco, Oscar H A1 - Polasek, Ozren A1 - Rudan, Igor A1 - Morange, Pierre-Emmanuel A1 - Wilson, James F A1 - Kardia, Sharon L R A1 - Ferrucci, Luigi A1 - Spector, Tim D A1 - Eriksson, Johan G A1 - Hansen, Torben A1 - Deary, Ian J A1 - Becker, Lewis C A1 - Scott, Rodney J A1 - Mitchell, Paul A1 - März, Winfried A1 - Wareham, Nick J A1 - Peters, Annette A1 - Greinacher, Andreas A1 - Wild, Philipp S A1 - Jukema, J Wouter A1 - Boomsma, Dorret I A1 - Hayward, Caroline A1 - Cucca, Francesco A1 - Tracy, Russell A1 - Watkins, Hugh A1 - Reiner, Alex P A1 - Folsom, Aaron R A1 - Ridker, Paul M A1 - O'Donnell, Christopher J A1 - Smith, Nicholas L A1 - Strachan, David P A1 - Dehghan, Abbas AB -Genome-wide association studies have previously identified 23 genetic loci associated with circulating fibrinogen concentration. These studies used HapMap imputation and did not examine the X-chromosome. 1000 Genomes imputation provides better coverage of uncommon variants, and includes indels. We conducted a genome-wide association analysis of 34 studies imputed to the 1000 Genomes Project reference panel and including ∼120 000 participants of European ancestry (95 806 participants with data on the X-chromosome). Approximately 10.7 million single-nucleotide polymorphisms and 1.2 million indels were examined. We identified 41 genome-wide significant fibrinogen loci; of which, 18 were newly identified. There were no genome-wide significant signals on the X-chromosome. The lead variants of five significant loci were indels. We further identified six additional independent signals, including three rare variants, at two previously characterized loci: FGB and IRF1. Together the 41 loci explain 3% of the variance in plasma fibrinogen concentration.

VL - 25 IS - 2 U1 - http://www.ncbi.nlm.nih.gov/pubmed/26561523?dopt=Abstract ER - TY - JOUR T1 - Genome-wide Trans-ethnic Meta-analysis Identifies Seven Genetic Loci Influencing Erythrocyte Traits and a Role for RBPMS in Erythropoiesis. JF - Am J Hum Genet Y1 - 2017 A1 - van Rooij, Frank J A A1 - Qayyum, Rehan A1 - Smith, Albert V A1 - Zhou, Yi A1 - Trompet, Stella A1 - Tanaka, Toshiko A1 - Keller, Margaux F A1 - Chang, Li-Ching A1 - Schmidt, Helena A1 - Yang, Min-Lee A1 - Chen, Ming-Huei A1 - Hayes, James A1 - Johnson, Andrew D A1 - Yanek, Lisa R A1 - Mueller, Christian A1 - Lange, Leslie A1 - Floyd, James S A1 - Ghanbari, Mohsen A1 - Zonderman, Alan B A1 - Jukema, J Wouter A1 - Hofman, Albert A1 - van Duijn, Cornelia M A1 - Desch, Karl C A1 - Saba, Yasaman A1 - Ozel, Ayse B A1 - Snively, Beverly M A1 - Wu, Jer-Yuarn A1 - Schmidt, Reinhold A1 - Fornage, Myriam A1 - Klein, Robert J A1 - Fox, Caroline S A1 - Matsuda, Koichi A1 - Kamatani, Naoyuki A1 - Wild, Philipp S A1 - Stott, David J A1 - Ford, Ian A1 - Slagboom, P Eline A1 - Yang, Jaden A1 - Chu, Audrey Y A1 - Lambert, Amy J A1 - Uitterlinden, André G A1 - Franco, Oscar H A1 - Hofer, Edith A1 - Ginsburg, David A1 - Hu, Bella A1 - Keating, Brendan A1 - Schick, Ursula M A1 - Brody, Jennifer A A1 - Li, Jun Z A1 - Chen, Zhao A1 - Zeller, Tanja A1 - Guralnik, Jack M A1 - Chasman, Daniel I A1 - Peters, Luanne L A1 - Kubo, Michiaki A1 - Becker, Diane M A1 - Li, Jin A1 - Eiriksdottir, Gudny A1 - Rotter, Jerome I A1 - Levy, Daniel A1 - Grossmann, Vera A1 - Patel, Kushang V A1 - Chen, Chien-Hsiun A1 - Ridker, Paul M A1 - Tang, Hua A1 - Launer, Lenore J A1 - Rice, Kenneth M A1 - Li-Gao, Ruifang A1 - Ferrucci, Luigi A1 - Evans, Michelle K A1 - Choudhuri, Avik A1 - Trompouki, Eirini A1 - Abraham, Brian J A1 - Yang, Song A1 - Takahashi, Atsushi A1 - Kamatani, Yoichiro A1 - Kooperberg, Charles A1 - Harris, Tamara B A1 - Jee, Sun Ha A1 - Coresh, Josef A1 - Tsai, Fuu-Jen A1 - Longo, Dan L A1 - Chen, Yuan-Tsong A1 - Felix, Janine F A1 - Yang, Qiong A1 - Psaty, Bruce M A1 - Boerwinkle, Eric A1 - Becker, Lewis C A1 - Mook-Kanamori, Dennis O A1 - Wilson, James G A1 - Gudnason, Vilmundur A1 - O'Donnell, Christopher J A1 - Dehghan, Abbas A1 - Cupples, L Adrienne A1 - Nalls, Michael A A1 - Morris, Andrew P A1 - Okada, Yukinori A1 - Reiner, Alexander P A1 - Zon, Leonard I A1 - Ganesh, Santhi K AB -Genome-wide association studies (GWASs) have identified loci for erythrocyte traits in primarily European ancestry populations. We conducted GWAS meta-analyses of six erythrocyte traits in 71,638 individuals from European, East Asian, and African ancestries using a Bayesian approach to account for heterogeneity in allelic effects and variation in the structure of linkage disequilibrium between ethnicities. We identified seven loci for erythrocyte traits including a locus (RBPMS/GTF2E2) associated with mean corpuscular hemoglobin and mean corpuscular volume. Statistical fine-mapping at this locus pointed to RBPMS at this locus and excluded nearby GTF2E2. Using zebrafish morpholino to evaluate loss of function, we observed a strong in vivo erythropoietic effect for RBPMS but not for GTF2E2, supporting the statistical fine-mapping at this locus and demonstrating that RBPMS is a regulator of erythropoiesis. Our findings show the utility of trans-ethnic GWASs for discovery and characterization of genetic loci influencing hematologic traits.

VL - 100 IS - 1 ER -