Nonetheless, our findings demonstrate that altered activity of the enhancer nearest to the Igf2 gene in the mouse affects TH protein levels and changes gene expression in pathways affecting neurodevelopment, neurosignaling, and synaptic activity, as was observed in major psychosis patients with a hypomethylated enhancer at IGF2. This shared consequence in humans and in transgenic mice supports the hypothesis that IGF2 enhancer activity is associated with altered TH regulation and dopamine synthesis. This evidence concerns the gene IGF2 and psychotic disorder.