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Distinguishing differential susceptibility, diathesis-stress and vantage sensitivity: beyond the single gene and environment model
Alexia Jolicoeur-Martineau, Jay Belsky, Eszter Szekely, Keith F. Widaman, Michael Pluess, Celia Greenwood, Ashley Wazana
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Currently, two main approaches exist to distinguish differential susceptibility from diathesis-stress and vantage sensitivity in genotype x environment interaction (GxE) research: Regions of significance (RoS) and competitive-confirmatory approaches. Each is limited by their single-gene/single-environment foci given that most phenotypes are the product of multiple interacting genetic and environmental factors. We thus addressed these two concerns in a recently developed R package (LEGIT) for constructing GxE interaction models with latent genetic and environmental scores using alternating optimization. Herein we test, by means of computer simulation, diverse GxE models in the context of both single and multiple genes and environments. Results indicate that the RoS and competitive-confirmatory approaches were highly accurate when the sample size was large, whereas the latter performed better in small samples and for small effect sizes. The confirmatory approach generally had good accuracy (a) when effect size was moderate and N >= 500 and (b) when effect size was large and N >= 250, whereas RoS performed poorly. Computational tools to determine the type of GxE of multiple genes and environments are provided as extensions in our LEGIT R package.
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