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DNA methylation, an epigenetic mechanism shaped by both genetic and environmental influences, may provide insights into individual differences in psychotherapy outcomes. We performed an epigenome-wide association study of psychotherapy response in 889 adults with obsessive-compulsive disorder (OCD) receiving the Bergen 4-Day Treatment, an intensive, concentrated exposure-based intervention. Saliva samples were collected before treatment, immediately after treatment, and at 3-month follow-up. DNA methylation was profiled using the Illumina EPIC v2 array. We identified three classes of differentially methylated regions (DMRs): (1) ten baseline DMRs associated with subsequent treatment response, (2) 23 DMRs showing stable associations with response across time points, and (3) three DMRs exhibiting longitudinal methylation changes associated with response. These loci were annotated to genes involved in neuroplasticity, neurodevelopment, stress response, immune function, mitochondrial processes, and gene regulation. Additional sex-stratified analyses identified several sex-specific DNA methylation signals associated with treatment response. Most baseline and time-stable methylation signals were influenced by genetic variation, whereas longitudinal signals showed no significant local genetic effects. In addition, modest shifts in monocyte and CD4+\u2009T-cell proportions were associated with treatment response. These findings suggest that response to exposure-based psychotherapy in OCD is associated with both trait-like and dynamic peripheral epigenetic variation. Pre-treatment DNA methylation profiles may ultimately help predict treatment outcomes and support future precision psychiatry approaches.<\/jats:p>","DOI":"10.1038\/s41386-026-02546-4","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T14:36:00Z","timestamp":1788964560000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Epigenetic markers of response to psychotherapy in obsessive-compulsive disorder"],"prefix":"10.1038","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0837-1469","authenticated-orcid":false,"given":"Kira D.","family":"H\u00f6ffler","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne-Kristin","family":"Stavrum","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew W.","family":"Halvorsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thorstein Olsen","family":"Eide","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4286-1277","authenticated-orcid":false,"given":"Kristen","family":"Hagen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anders Lillevik","family":"Thorsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0728-3141","authenticated-orcid":false,"given":"Olga Therese","family":"Ousdal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gerd","family":"Kvale","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9051-1557","authenticated-orcid":false,"given":"James J.","family":"Crowley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7865-2808","authenticated-orcid":false,"given":"Jan","family":"Haavik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5158-1103","authenticated-orcid":false,"given":"Kerry J.","family":"Ressler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bjarne","family":"Hansen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephanie","family":"Le Hellard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,9]]},"reference":[{"key":"2546_CR1","doi-asserted-by":"publisher","first-page":"133","DOI":"10.1002\/wps.20941","volume":"21","author":"F Leichsenring","year":"2022","unstructured":"Leichsenring F, Steinert C, Rabung S, Ioannidis JPA. 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