HYST: a hybrid set-based test for genome-wide association studies, with application to protein-protein interaction-based association analysis.

Abstract:

:The extended Simes' test (known as GATES) and scaled chi-square test were proposed to combine a set of dependent genome-wide association signals at multiple single-nucleotide polymorphisms (SNPs) for assessing the overall significance of association at the gene or pathway levels. The two tests use different strategies to combine association p values and can outperform each other when the number of and linkage disequilibrium between SNPs vary. In this paper, we introduce a hybrid set-based test (HYST) combining the two tests for genome-wide association studies (GWASs). We describe how HYST can be used to evaluate statistical significance for association at the protein-protein interaction (PPI) level in order to increase power for detecting disease-susceptibility genes of moderate effect size. Computer simulations demonstrated that HYST had a reasonable type 1 error rate and was generally more powerful than its parents and other alternative tests to detect a PPI pair where both genes are associated with the disease of interest. We applied the method to three complex disease GWAS data sets in the public domain; the method detected a number of highly connected significant PPI pairs involving multiple confirmed disease-susceptibility genes not found in the SNP- and gene-based association analyses. These results indicate that HYST can be effectively used to examine a collection of predefined SNP sets based on prior biological knowledge for revealing additional disease-predisposing genes of modest effects in GWASs.

journal_name

Am J Hum Genet

authors

Li MX,Kwan JS,Sham PC

doi

10.1016/j.ajhg.2012.08.004

subject

Has Abstract

pub_date

2012-09-07 00:00:00

pages

478-88

issue

3

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(12)00416-8

journal_volume

91

pub_type

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