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2016 ; 25
(9
): 1857-66
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A general framework for meta-analyzing dependent studies with overlapping
subjects in association mapping
#MMPMID26908615
Han B
; Duong D
; Sul JH
; de Bakker PI
; Eskin E
; Raychaudhuri S
Hum Mol Genet
2016[May]; 25
(9
): 1857-66
PMID26908615
show ga
Meta-analysis strategies have become critical to augment power of genome-wide
association studies (GWAS). To reduce genotyping or sequencing cost, many studies
today utilize shared controls, and these individuals can inadvertently overlap
among multiple studies. If these overlapping individuals are not taken into
account in meta-analysis, they can induce spurious associations. In this article,
we propose a general framework for adjusting association statistics to account
for overlapping subjects within a meta-analysis. The key idea of our method is to
transform the covariance structure of the data, so it can be used in downstream
analyses. As a result, the strategy is very flexible and allows a wide range of
meta-analysis methods, such as the random effects model, to account for
overlapping subjects. Using simulations and real datasets, we demonstrate that
our method has utility in meta-analyses of GWAS, as well as in a multi-tissue
mouse expression quantitative trait loci (eQTL) study where our method increases
the number of discovered eQTL by up to 19% compared with existing methods.