A combination of toxicity phenotyping, transcriptomics, chromatin state analyses, and genetic variability in a population-based model allow exploration of Gene×Environment×Epigenome interactions. Abbreviations: eQTL, expression quantitative trait loci; cQTL, chromatin QTL; ecQTLs, environmental chromatin QTL; toxQTL, toxicity QTL; eeQTL, environmental expression QTL.