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Dealing with Heterogeneity between Cohorts in Genomewide SNP Association Studies

Author

Listed:
  • Lebrec Jeremie J

    (Leiden University Medical Center, The Netherlands)

  • Stijnen Theo

    (Leiden University Medical Center)

  • van Houwelingen Hans C

    (Leiden University Medical Center)

Abstract

In Genomewide association (GWA) studies investigating thousands of SNPs, large sample sizes are needed to obtain a reasonable power after correction for multiple testing. To obtain the necessary sample sizes, data from different populations/cohorts are combined. The problem of pooling evidence across cohorts bears some resemblance with meta-analysis of clinical trials, and in fact classical meta-analytic methodologies from that field are typically used in GWAs. However, in genetics, it can be expected that the cohorts show some amount of heterogeneity in the association measures that are used for significance testing. In this paper, we demonstrate how it is possible to exploit this heterogeneity to improve our ability to detect influential genetic variants. We also discuss how pathway analysis based on summary data can help resolve heterogeneity. The current standard method for testing SNPs across cohorts in GWAs will miss heterogeneous but important genetic variants affecting complex diseases. Our new testing strategy has the potential to detect them while maintaining sensitivity to variants with homogeneous effects.

Suggested Citation

  • Lebrec Jeremie J & Stijnen Theo & van Houwelingen Hans C, 2010. "Dealing with Heterogeneity between Cohorts in Genomewide SNP Association Studies," Statistical Applications in Genetics and Molecular Biology, De Gruyter, vol. 9(1), pages 1-22, January.
    • Handle: RePEc:bpj:sagmbi:v:9:y:2010:i:1:n:8
    DOI: 10.2202/1544-6115.1503
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    References listed on IDEAS

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    1. Jelle J. Goeman & Sara A. Van De Geer & Hans C. Van Houwelingen, 2006. "Testing against a high dimensional alternative," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 68(3), pages 477-493, June.
    2. John PA Ioannidis & Nikolaos A Patsopoulos & Evangelos Evangelou, 2007. "Heterogeneity in Meta-Analyses of Genome-Wide Association Investigations," PLOS ONE, Public Library of Science, vol. 2(9), pages 1-7, September.
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