%0 Journal Article %J Am J Hum Genet %D 2014 %T Effects of long-term averaging of quantitative blood pressure traits on the detection of genetic associations. %A Ganesh, Santhi K %A Chasman, Daniel I %A Larson, Martin G %A Guo, Xiuqing %A Verwoert, Germain %A Bis, Joshua C %A Gu, Xiangjun %A Smith, Albert V %A Yang, Min-Lee %A Zhang, Yan %A Ehret, Georg %A Rose, Lynda M %A Hwang, Shih-Jen %A Papanicolau, George J %A Sijbrands, Eric J %A Rice, Kenneth %A Eiriksdottir, Gudny %A Pihur, Vasyl %A Ridker, Paul M %A Vasan, Ramachandran S %A Newton-Cheh, Christopher %A Raffel, Leslie J %A Amin, Najaf %A Rotter, Jerome I %A Liu, Kiang %A Launer, Lenore J %A Xu, Ming %A Caulfield, Mark %A Morrison, Alanna C %A Johnson, Andrew D %A Vaidya, Dhananjay %A Dehghan, Abbas %A Li, Guo %A Bouchard, Claude %A Harris, Tamara B %A Zhang, He %A Boerwinkle, Eric %A Siscovick, David S %A Gao, Wei %A Uitterlinden, André G %A Rivadeneira, Fernando %A Hofman, Albert %A Willer, Cristen J %A Franco, Oscar H %A Huo, Yong %A Witteman, Jacqueline C M %A Munroe, Patricia B %A Gudnason, Vilmundur %A Palmas, Walter %A van Duijn, Cornelia %A Fornage, Myriam %A Levy, Daniel %A Psaty, Bruce M %A Chakravarti, Aravinda %K Blood Pressure %K Genome-Wide Association Study %K Humans %K Longitudinal Studies %K Phenotype %K Polymorphism, Single Nucleotide %K Quantitative Trait Loci %X

Blood pressure (BP) is a heritable, quantitative trait with intraindividual variability and susceptibility to measurement error. Genetic studies of BP generally use single-visit measurements and thus cannot remove variability occurring over months or years. We leveraged the idea that averaging BP measured across time would improve phenotypic accuracy and thereby increase statistical power to detect genetic associations. We studied systolic BP (SBP), diastolic BP (DBP), mean arterial pressure (MAP), and pulse pressure (PP) averaged over multiple years in 46,629 individuals of European ancestry. We identified 39 trait-variant associations across 19 independent loci (p < 5 × 10(-8)); five associations (in four loci) uniquely identified by our LTA analyses included those of SBP and MAP at 2p23 (rs1275988, near KCNK3), DBP at 2q11.2 (rs7599598, in FER1L5), and PP at 6p21 (rs10948071, near CRIP3) and 7p13 (rs2949837, near IGFBP3). Replication analyses conducted in cohorts with single-visit BP data showed positive replication of associations and a nominal association (p < 0.05). We estimated a 20% gain in statistical power with long-term average (LTA) as compared to single-visit BP association studies. Using LTA analysis, we identified genetic loci influencing BP. LTA might be one way of increasing the power of genetic associations for continuous traits in extant samples for other phenotypes that are measured serially over time.

%B Am J Hum Genet %V 95 %P 49-65 %8 2014 Jul 03 %G eng %N 1 %1 http://www.ncbi.nlm.nih.gov/pubmed/24975945?dopt=Abstract %R 10.1016/j.ajhg.2014.06.002 %0 Journal Article %J Am J Hum Genet %D 2017 %T Genome-wide Trans-ethnic Meta-analysis Identifies Seven Genetic Loci Influencing Erythrocyte Traits and a Role for RBPMS in Erythropoiesis. %A van Rooij, Frank J A %A Qayyum, Rehan %A Smith, Albert V %A Zhou, Yi %A Trompet, Stella %A Tanaka, Toshiko %A Keller, Margaux F %A Chang, Li-Ching %A Schmidt, Helena %A Yang, Min-Lee %A Chen, Ming-Huei %A Hayes, James %A Johnson, Andrew D %A Yanek, Lisa R %A Mueller, Christian %A Lange, Leslie %A Floyd, James S %A Ghanbari, Mohsen %A Zonderman, Alan B %A Jukema, J Wouter %A Hofman, Albert %A van Duijn, Cornelia M %A Desch, Karl C %A Saba, Yasaman %A Ozel, Ayse B %A Snively, Beverly M %A Wu, Jer-Yuarn %A Schmidt, Reinhold %A Fornage, Myriam %A Klein, Robert J %A Fox, Caroline S %A Matsuda, Koichi %A Kamatani, Naoyuki %A Wild, Philipp S %A Stott, David J %A Ford, Ian %A Slagboom, P Eline %A Yang, Jaden %A Chu, Audrey Y %A Lambert, Amy J %A Uitterlinden, André G %A Franco, Oscar H %A Hofer, Edith %A Ginsburg, David %A Hu, Bella %A Keating, Brendan %A Schick, Ursula M %A Brody, Jennifer A %A Li, Jun Z %A Chen, Zhao %A Zeller, Tanja %A Guralnik, Jack M %A Chasman, Daniel I %A Peters, Luanne L %A Kubo, Michiaki %A Becker, Diane M %A Li, Jin %A Eiriksdottir, Gudny %A Rotter, Jerome I %A Levy, Daniel %A Grossmann, Vera %A Patel, Kushang V %A Chen, Chien-Hsiun %A Ridker, Paul M %A Tang, Hua %A Launer, Lenore J %A Rice, Kenneth M %A Li-Gao, Ruifang %A Ferrucci, Luigi %A Evans, Michelle K %A Choudhuri, Avik %A Trompouki, Eirini %A Abraham, Brian J %A Yang, Song %A Takahashi, Atsushi %A Kamatani, Yoichiro %A Kooperberg, Charles %A Harris, Tamara B %A Jee, Sun Ha %A Coresh, Josef %A Tsai, Fuu-Jen %A Longo, Dan L %A Chen, Yuan-Tsong %A Felix, Janine F %A Yang, Qiong %A Psaty, Bruce M %A Boerwinkle, Eric %A Becker, Lewis C %A Mook-Kanamori, Dennis O %A Wilson, James G %A Gudnason, Vilmundur %A O'Donnell, Christopher J %A Dehghan, Abbas %A Cupples, L Adrienne %A Nalls, Michael A %A Morris, Andrew P %A Okada, Yukinori %A Reiner, Alexander P %A Zon, Leonard I %A Ganesh, Santhi K %X

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.

%B Am J Hum Genet %V 100 %P 51-63 %8 2017 Jan 05 %G eng %N 1 %R 10.1016/j.ajhg.2016.11.016