Oxytocin Receptor Gene Methylation as a Molecular Marker for Severity of Depressive Symptoms in Affective Disorder Patients
Abstract Background: Oxytocin (OXT) is a neuropeptide and hormone involved in emotional functioning and also seems to play a role in moderating the stress response. Both preclinical and clinical studies point to an increased methylation status of the Oxytocin receptor (OXTR) promoter region with concomitant deficits in social, cognitive and emotional functioning. We hypothesize that methylation levels (%) of the oxytocin receptor promoter region correlate with the severity of depression symptoms within this present sample of affective disorder patients. Methodology: Eight hundred forty six Caucasian affective disorder patients were recruited at the Department of Psychiatry and Psychotherapy of the Medical University Vienna, the Karl Landsteiner University for Health and Science and Zentrum für seelische Gesundheit, BBRZ-Med Leopoldau. The assessment included an assemblage of psychiatric interviews (e.g. SCAN, HAMD, CTQ) and concomitantly DNA samples of peripheral blood cells were collected for Multiplexed and Sensitive DNA Methylation Testing. Results: Our data suggests a positive but not significant association between OXTR promoter Exons 1-3 methylation levels and severity of depression symptoms in affective disorder patients. Conclusions: Our findings contribute to elucidate the role of OXTR in affective disorders, but further longitudinal studies in particular are necessary to broaden the current state of knowledge.