BDNF and post-traumatic stress disorder: In a pilot study based on blood sample and personal questionnaire, epigenetic signatures for seven selected genes relevant to psychiatric disorders and PTSD were compared between 62 exposed and 50 nonexposed women to IPV.12 Three (BDNF, DRD2, and IGF2) of the seven genes considered turned out to have a methylation perturbation in the subgroup of women (23% of the cohort) who reported at least one PTSD criterion.