title: Efficient genome-wide association testing of gene-environment interaction in case-parent trios.
abstract: Complex trait variation is likely to be explained by the combined effects of genes, environmental factors, and gene x environment (G x E) interaction. The authors introduce a novel 2-step method for detecting a G x E interaction in a genome-wide association study (GWAS) of case-parent trios. The method utilizes 2 sources of G x E information in a trio sample to construct a screening step and a testing step. Across a wide range of models, this 2-step procedure provides substantially greater power to detect G x E interaction than a standard test of G x E interaction applied genome-wide. For example, for a disease susceptibility locus with minor allele frequency of 15%, a binary exposure variable with 50% prevalence, and a GWAS scan of 1 million markers in 1,000 case-parent trios, the 2-step method provides 87% power to detect a G x E interaction relative risk of 2.3, as compared with only 25% power using a standard G x E test. The method is easily implemented using standard software. This 2-step scan for G x E interaction is independent of any prior scan that may have been conducted for genetic main effects, and thus has the potential to uncover new genes in a GWAS that have not been previously identified.
authors.affiliation: Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, 90033, USA. jimg@usc.edu
authors.forename: W James
authors.initials: WJ
authors.lastname: Gauderman
authors.forename: Duncan C
authors.initials: DC
authors.lastname: Thomas
authors.forename: Cassandra E
authors.initials: CE
authors.lastname: Murcray
authors.forename: David
authors.initials: D
authors.lastname: Conti
authors.forename: Dalin
authors.initials: D
authors.lastname: Li
authors.forename: Juan Pablo
authors.initials: JP
authors.lastname: Lewinger
mesh_terms: D004777:Environment; D004812:Epidemiologic Methods; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005820:Genetic Testing; D015894:Genome, Human; D055106:Genome-Wide Association Study / Q000379:methods*; D006801:Humans; D008957:Models, Genetic; D010290:Parents; D020641:Polymorphism, Single Nucleotide