Omics Environmental sciences Exposomics 1.26 Gene–environment interaction (GxE) Genotype-environment interaction (G×E) Exposome Environmental factor Environment-wide association study (EWAS) Environmental exposure Exposomics is the systematic and comprehensive study of the exposome and the associated biological responses (exposure-phenotype interaction). Exposome is the totality of environmental exposures, that is, the cumulative (e.g. life-long) totality of contacts between external factors (e.g. chemical agents) and a living organism, a population, or a biological taxon. Functional exposomics