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Comparison of HapMap and 1000 genomes reference panels in a large-scale genome-wide association study

  • Paul S. De Vries
  • , Maria Sabater-Lleal
  • , Daniel I. Chasman
  • , Stella Trompet
  • , Tarunveer S. Ahluwalia
  • , Alexander Teumer
  • , Marcus E. Kleber
  • , Ming Huei Chen
  • , Jie Jin Wang
  • , John R. Attia
  • , Riccardo E. Marioni
  • , Maristella Steri
  • , Lu Chen Weng
  • , Rene Pool
  • , Vera Grossmann
  • , Jennifer A. Brody
  • , Cristina Venturini
  • , Toshiko Tanaka
  • , Lynda M. Rose
  • , Christopher Oldmeadow
  • Johanna Mazur, Saonli Basu, Mattias Frånberg, Qiong Yang, Symen Ligthart, Jouke J. Hottenga, Ann Rumley, Antonella Mulas, Anton J.M. De Craen, Anne Grotevendt, Kent D. Taylor, Graciela E. Delgado, Annette Kifley, Lorna M. Lopez, Tina L. Berentzen, Massimo Mangino, Stefania Bandinelli, Alanna C. Morrison, Anders Hamsten, Geoffrey Tofler, Moniek P.M. De Maat, Harmen H.M. Draisma, Gordon D. Lowe, Magdalena Zoledziewska, Naveed Sattar, Karl J. Lackner, Uwe Völker, Barbara McKnight, Jie Huang, Elizabeth G. Holliday, Mark A. McEvoy, John M. Starr, Pirro G. Hysi, Dena G. Hernandez, Weihua Guan, Fernando Rivadeneira, Wendy L. McArdle, P. Eline Slagboom, Tanja Zeller, Bruce M. Psaty, André G. Uitterlinden, Eco J.C. De Geus, David J. Stott, Harald Binder, Albert Hofman, Oscar H. Franco, Jerome I. Rotter, Luigi Ferrucci, Tim D. Spector, Ian J. Deary, Winfried März, Andreas Greinacher, Philipp S. Wild, Francesco Cucca, Dorret I. Boomsma, Hugh Watkins, Weihong Tang, Paul M. Ridker, Jan W. Jukema, Rodney J. Scott, Paul Mitchell, Torben Hansen, Christopher J. O'Donnell, Nicholas L. Smith, David P. Strachan, Abbas Dehghan
  • Erasmus University Rotterdam
  • University of Texas Health Science Center at Houston
  • Karolinska Institutet
  • Brigham and Women’s Hospital
  • Harvard University
  • Leiden University
  • Novo Nordisk Foundation
  • University of Copenhagen
  • University of Greifswald
  • Heidelberg University 
  • Boston University
  • National Institutes of Health
  • The University of Sydney
  • University of Newcastle
  • University of Edinburgh
  • University of Queensland
  • National Research Council of Italy
  • University of Minnesota Twin Cities
  • Vrije Universiteit Amsterdam
  • VU University Medical Center
  • Johannes Gutenberg University Mainz
  • University of Washington
  • University College London
  • King's College London
  • Stockholm University
  • University of Glasgow
  • University of California at Los Angeles
  • Royal College of Surgeons in Ireland
  • University College Dublin
  • Guy's and St Thomas' NHS Foundation Trust
  • Azienda Sanitaria Firenze
  • University of Glasgow
  • Wellcome Trust Sanger Institute
  • University of Bristol
  • University of Hamburg
  • German Centre for Cardiovascular Research
  • Group Health Cooperative
  • SYNLAB Holding Deutschland GmbH
  • Medical University of Graz
  • University of Oxford
  • Durrer Center for Cardiovascular Research
  • Interuniversity Cardiology Institute of the Netherlands
  • Massachusetts General Hospital
  • Seattle Epidemiologic Research and Information Center
  • St. George’s Hospital
  • Imperial College London

Research output: Contribution to journalArticlepeer-review

Abstract

An increasing number of genome-wide association (GWA) studies are now using the higher resolution 1000 Genomes Project reference panel (1000G) for imputation, with the expectation that 1000G imputation will lead to the discovery of additional associated loci when compared to HapMap imputation. In order to assess the improvement of 1000G over HapMap imputation in identifying associated loci, we compared the results of GWA studies of circulating fibrinogen based on the two reference panels. Using both HapMap and 1000G imputation we performed a meta-analysis of 22 studies comprising the same 91,953 individuals. We identified six additional signals using 1000G imputation, while 29 loci were associated using both HapMap and 1000G imputation. One locus identified using HapMap imputation was not significant using 1000G imputation. The genome-wide significance threshold of 5×10-8 is based on the number of independent statistical tests using HapMap imputation, and 1000G imputation may lead to further independent tests that should be corrected for. When using a stricter Bonferroni correction for the 1000G GWA study (P-value < 2.5×10-8), the number of loci significant only using HapMap imputation increased to 4 while the number of loci significant only using 1000G decreased to 5. In conclusion, 1000G imputation enabled the identification of 20% more loci than HapMap imputation, although the advantage of 1000G imputation became less clear when a stricter Bonferroni correction was used. More generally, our results provide insights that are applicable to the implementation of other dense reference panels that are under development.

Original languageEnglish
Article numbere0167742
JournalPLoS ONE
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2017
Externally publishedYes

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