For the meta-analysis of genome-wide association studies, we propose a new method to adjust for the population stratification and a linear mixed approach that combines family-based and unrelated samples. The proposed approach achieves similar power levels as a standard meta-analysis which combines the different test statistics or p values across studies. However, by virtue of its design, the proposed approach is robust against population admixture and stratification, and no adjustments for population admixture and stratification, even in unrelated samples, are required. Using simulation studies, we examine the power of the proposed method and compare it to standard approaches in the meta-analysis of genome-wide association studies. The practical features of the approach are illustrated with a meta-analysis of three genome-wide association studies for Alzheimer’s disease. We identify three single nucleotide polymorphisms showing significant genome-wide association with affection status. Two single nucleotide polymorphisms are novel and will be verified in other populations in our follow-up study.
© 2012 S. Karger AG, Basel
- Genome-wide study
- Population stratification
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Department of Applied Statistics
Seoul 156-756 (Republic of Korea)
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Received: March 13, 2011
Accepted after revision: July 15, 2011
Published online: January 18, 2012
Number of Print Pages : 12
Number of Figures : 2, Number of Tables : 5, Number of References : 36
Human Heredity (International Journal of Human and Medical Genetics)
Vol. 73, No. 1, Year 2012 (Cover Date: March 2012)
Journal Editor: Devoto M. (Philadelphia, Pa./Rome)
ISSN: 0001-5652 (Print), eISSN: 1423-0062 (Online)
For additional information: http://www.karger.com/HHE
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