The etiopathogenesis of mental disorders is not fully understood and accumulating evidence support that clinical symptomatology cannot be assigned to a single gene mutation, but it involves several genetic factors. More specifically, a tight association between genes and environmental risk factors, which could be mediated by epigenetic mechanisms, may play a role in the development of mental disorders. Several data suggest that epigenetic modifications such as DNA methylation, post-translational histone modification and interference of microRNA (miRNA) or long non-coding RNA (lncRNA) may modify the severity of the disease and the outcome of the therapy. Indeed, the study of these mechanisms may help to identify patients particularly vulnerable to mental disorders and may have potential utility as biomarkers to facilitate diagnosis and treatment of psychiatric disorders. This article summarizes the most relevant preclinical and human data showing how epigenetic modifications can be central to the therapeutic efficacy of antidepressant and/or antipsychotic agents, as possible predictor of drugs response.

Department of Biomedical and Biotechnological Sciences Section of Pharmacology University of Catania Catania Italy

Department of Biomedical and Clinical Sciences 'Luigi Sacco' University of Milan Milan Italy Department of Mental Health ASST Fatebenefratelli Sacco Milan Italy; Aldo Ravelli Research Center for Neurotechnology and Experimental Brain Therapeutics Department of Health Sciences University of Milan Medical School Milan Italy; Department of Psychiatry and Behavioral Sciences Stanford University CA USA

Department of Pharmacology Faculty of Medicine Masaryk University Brno Czech Republic; Scientific Core Unit Neuroimaging Max Planck Institute of Psychiatry Munich Germany

Faculty of Bioscience and Technology for Food Agriculture and Environment University of Teramo Teramo Italy

Faculty of Bioscience and Technology for Food Agriculture and Environment University of Teramo Teramo Italy; Department of Clinical Neuroscience Karolinska Institutet Stockholm Sweden

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