A research that included 48 patients with psychotic disorders, 50 unaffected siblings, and 46 healthy controls showed that there was significant demethylation determined by the T-allele of rs1360780 in the patient group, while there was an interaction between the T-allele and child abuse that had a significant effect on FKBP5 demethylation, an effect that was only verified in the control group. Here, FKBP5 is linked to psychotic disorder.