TAC1 and post-traumatic stress disorder: It is probably due to an imbalance between two neurochemical systems in the brain (serotonin and substance P), and the severity depends on the degree of the gap.40 Given that DNA methylation patterns may affect the ability to adapt to traumatic events and consequently the risk of developing PTSD, much of the literature has focused on the molecular aspects of the disorder, thanks to epigenome-wide association studies (EWAS).41,42 However, precise evidence specifically focusing on women abuse is scant.