{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T19:33:41Z","timestamp":1771616021718,"version":"3.50.1"},"update-to":[{"DOI":"10.1371\/journal.pgen.1012045","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T00:00:00Z","timestamp":1771545600000}}],"reference-count":57,"publisher":"Public Library of Science (PLoS)","issue":"2","license":[{"start":{"date-parts":[[2026,2,17]],"date-time":"2026-02-17T00:00:00Z","timestamp":1771286400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"JSPS KAKENHI","award":["21H02528"],"award-info":[{"award-number":["21H02528"]}]},{"name":"Grant-in-Aid for Scientific Research on Innovative Areas from the Ministry of Education, Culture, Sports, Science, and Technology of Japan","award":["21H00434"],"award-info":[{"award-number":["21H00434"]}]}],"content-domain":{"domain":["www.plosgenetics.org"],"crossmark-restriction":false},"short-container-title":["PLoS Genet"],"abstract":"<jats:p>\n                    Circadian clock genes are best known for regulating circadian rhythms, but they also play crucial roles in memory processes. This suggests that memory is modulated by neural networks containing clock neurons, although the underlying mechanisms remain unclear. In\n                    <jats:italic>Drosophila melanogaster<\/jats:italic>\n                    , approximately 240 clock neurons are grouped into at least eight distinct clusters. Among them, the dorsal\u2013lateral neurons (LNds) are required for maintaining long-term memory (LTM). In contrast, the neuropeptide Pigment-dispersing factor (Pdf), expressed in both small and large ventral\u2013lateral neurons (s-LNvs and l-LNvs, respectively), functions as a circadian output signal and is also essential for maintaining LTM. In addition, Pdf-expressing neurons (hereafter, Pdf neurons) release neurotransmitters other than Pdf, which are involved in LTM consolidation. However, the specific transmitters used by LNds and Pdf neurons in LTM processing have remained unknown. Here, we show that octopamine signaling from LNds is essential for LTM maintenance, whereas octopamine in Pdf neurons is essential for LTM consolidation. Temporally restricted knockdown of\n                    <jats:italic>Tyramine<\/jats:italic>\n                    \u03b2\n                    <jats:italic>hydroxylase<\/jats:italic>\n                    (\n                    <jats:italic>Tbh<\/jats:italic>\n                    ), the gene encoding the enzyme required for octopamine synthesis, disrupted LTM maintenance when targeted in LNds, whereas it impaired LTM consolidation when targeted in Pdf neurons. Notably,\n                    <jats:italic>Tbh<\/jats:italic>\n                    knockdown in LNds or Pdf neurons had minimal effects on circadian behavioral rhythms or sleep. These findings reveal that octopamine released from specific subtypes of clock neurons independently regulates distinct phases of LTM in\n                    <jats:italic>Drosophila<\/jats:italic>\n                    .\n                  <\/jats:p>","DOI":"10.1371\/journal.pgen.1012045","type":"journal-article","created":{"date-parts":[[2026,2,17]],"date-time":"2026-02-17T18:40:42Z","timestamp":1771353642000},"page":"e1012045","update-policy":"https:\/\/doi.org\/10.1371\/journal.pgen.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Octopamine signaling from clock neurons plays dual roles in Drosophila long-term 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