Genome-wide gene-environment interactions in neuroticism: an exploratory study across 25 environments

Josefin Werme*, Sophie van der Sluis, Danielle Posthuma, Christiaan A. de Leeuw*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Gene-environment interactions (GxE) are often suggested to play an important role in the aetiology of psychiatric phenotypes, yet so far, only a handful of genome-wide environment interaction studies (GWEIS) of psychiatric phenotypes have been conducted. Representing the most comprehensive effort of its kind to date, we used data from the UK Biobank to perform a series of GWEIS for neuroticism across 25 broadly conceptualised environmental risk factors (trauma, social support, drug use, physical health). We investigated interactions on the level of SNPs, genes, and gene-sets, and computed interaction-based polygenic risk scores (PRS) to predict neuroticism in an independent sample subset (N = 10,000). We found that the predictive ability of the interaction-based PRSs did not significantly improve beyond that of a traditional PRS based on SNP main effects from GWAS, but detected one variant and two gene-sets showing significant interaction signal after correction for the number of analysed environments. This study illustrates the possibilities and limitations of a comprehensive GWEIS in currently available sample sizes.
Original languageEnglish
Article number180
JournalTranslational psychiatry
Volume11
Issue number1
DOIs
Publication statusPublished - 1 Jun 2021

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