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The dorsal raphe nucleus (DRN) in the midbrain has been established as an important site of opioid action and is an integral hub in behavioral modulation. To investigate the functional significance of DRN opioid signaling in aversive and appetitive behaviors we disrupted preproenkephalin (Penk) in DRN using CRISPR-Cas9 technology in Penk-Cre mice. We found that CRISPR mediated knockdown of enkephalin peptide in the DRN (DRN\n                    <jats:sup>Penk<\/jats:sup>\n                    ) enhanced inflammation-induced mechanical sensitivity and odor avoidance. Additionally, loss of DRN\n                    <jats:sup>Penk<\/jats:sup>\n                    diminished sucrose preference and engagement with a novel social stimulus. To further characterize the opioid system within the DRN, we performed Hiplex in situ hybridization of 12 genes in the same tissue. This revealed that DRN\n                    <jats:sup>Penk<\/jats:sup>\n                    is largely separate from DRN serotonin cells and is instead distributed on glutamatergic and GABAergic cells. However, subtype-specific knockdown of DRN\n                    <jats:sup>Penk<\/jats:sup>\n                    from glutamatergic and GABAergic cells was insufficient to replicate the behavioral effects of general DRN\n                    <jats:sup>Penk<\/jats:sup>\n                    knockdown. This suggests that these neurons represent a novel population that mediate motivated behaviors distinctly from canonical DRN mechanisms.\n                  <\/jats:p>","DOI":"10.1038\/s41386-026-02456-5","type":"journal-article","created":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T12:13:06Z","timestamp":1780315986000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dorsal raphe nucleus enkephalin peptide modulates behavioral preference"],"prefix":"10.1038","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-6769-0824","authenticated-orcid":false,"given":"Kathryn","family":"Braden","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-2431-9880","authenticated-orcid":false,"given":"Andrew","family":"Trinagel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric","family":"Acevedo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura N.","family":"Mass\u00f3-Qui\u00f1ones","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexandra E.","family":"Bernstein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcela","family":"Arguello","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aidan","family":"Evans-Strong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samantha S.","family":"Dunn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8036-1313","authenticated-orcid":false,"given":"Daniel C.","family":"Castro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,6,1]]},"reference":[{"key":"2456_CR1","doi-asserted-by":"publisher","first-page":"11754","DOI":"10.3390\/ijerph191811754","volume":"19","author":"H Biancuzzi","year":"2022","unstructured":"Biancuzzi H, Dal Mas F, Brescia V, Campostrini S, Cascella M, Cuomo A, et al. 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