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Recent studies showed that the primary cellular mediators of these effects are dopamine 1 receptor-positive striatal projection neurons (D1-SPNs). Specifically, D1-SPN activity gets inhibited during reward consumption, and such inhibition is necessary and sufficient to authorize consumption, independent of metabolic need. Anatomically, the medNAcSh spans 1\u20131.5 mm along the rostro-caudal axis in mice, and previous studies have reported functional gradients along this axis. For instance, pharmacological studies have suggested that rostral rather than caudal medNAcSh regulates appetitive behavior. However, the mechanisms underlying this topographical gradient remain unknown. Here, we hypothesized that D1-SPNs contribute to this gradient by regulating hedonic feeding via a specific hotspot in the rostral medNAcSh. Using calcium monitoring with fiber photometry in mice, we show that rostral medNAcSh D1-SPNs demonstrate inhibitory responses during reward consumption, while caudal D1-SPNs do not. Consistently, optogenetic stimulation of rostral D1-SPNs inhibits consumption, while stimulation of caudal D1-SPNs had minimal effects, confirming the existence of a functional rostro-caudal gradient. Importantly, we observed no differences between rostral and caudal D1-SPNs in their responses to aversive stimuli, suggesting that the D1-SPN gradient is specific to appetitive contexts. To investigate potential molecular correlates of this functional gradient, we leveraged open-source anatomy datasets and performed fluorescent in situ hybridization, identifying\n                    <jats:italic>Stard5<\/jats:italic>\n                    and\n                    <jats:italic>Peg10<\/jats:italic>\n                    as markers enriched in the rostral and caudal medNAcSh, respectively. Finally, we developed a novel Stard5-Flp driver line to selectively target the rostral hotspot and demonstrated that Stard5+ neurons recapitulate rostral D1-SPN activity patterns. Together, these findings establish a spatially confined rostral medNAcSh subregion as a critical regulator of reward consumption and introduce Stard5 as a molecular tool for its manipulation, offering new opportunities for intervention in dysregulated eating.\n                  <\/jats:p>","DOI":"10.7554\/elife.108639","type":"journal-article","created":{"date-parts":[[2025,10,21]],"date-time":"2025-10-21T15:30:42Z","timestamp":1761060642000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.108639","source":"Crossref","is-referenced-by-count":0,"title":["The nucleus accumbens shell regulates hedonic feeding via a rostral hotspot"],"prefix":"10.7554","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-4073-0402","authenticated-orcid":true,"given":"Alina-M\u0103riuca","family":"Marinescu","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05a28rw58","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Health Sciences and Technology, ETH 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