{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T16:25:32Z","timestamp":1783959932038,"version":"3.55.0"},"reference-count":53,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,1,19]],"date-time":"2024-01-19T00:00:00Z","timestamp":1705622400000},"content-version":"vor","delay-in-days":18,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100013655","name":"Helmholtz-Fonds","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100013655","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Pineal Research"],"published-print":{"date-parts":[[2024,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Temporal signals such as light and temperature cycles profoundly modulate animal physiology and behaviour. Via endogenous timing mechanisms which are regulated by these signals, organisms can anticipate cyclic environmental changes and thereby enhance their fitness. The pineal gland in fish, through the secretion of melatonin, appears to play a critical role in the circadian system, most likely acting as an element of the circadian clock system. An important output of this circadian clock is the locomotor activity circadian rhythm which is adapted to the photoperiod and thus determines whether animals are diurnal or nocturnal. By using a genetically modified zebrafish strain known as Tg (<jats:italic>Xla<\/jats:italic>.<jats:italic>Eef1a1<\/jats:italic>:<jats:italic>Cau.asip1<\/jats:italic>)iim04, which expresses a higher level of the agouti signalling protein 1 (Asip1), an endogenous antagonist of the melanocortin system, we observed a complete disruption of locomotor activity patterns, which correlates with the ablation of the melatonin daily rhythm. Consistent with this, in vitro experiments also demonstrated that Asip1 inhibits melatonin secretion from the zebrafish pineal gland, most likely through the melanocortin receptors expressed in this gland. Asip1 overexpression also disrupted the expression of core clock genes, including <jats:italic>per1a<\/jats:italic> and <jats:italic>clock1a<\/jats:italic>, thus blunting circadian oscillation. Collectively, these results implicate the melanocortin system as playing an important role in modulating pineal physiology and, therefore, circadian organisation in zebrafish.<\/jats:p>","DOI":"10.1111\/jpi.12939","type":"journal-article","created":{"date-parts":[[2024,1,19]],"date-time":"2024-01-19T20:25:37Z","timestamp":1705695937000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Role of melanocortin system in the locomotor activity rhythms and melatonin secretion as revealed by <i>agouti\u2010signalling protein<\/i> (<i>asip1<\/i>) overexpression in zebrafish"],"prefix":"10.1111","volume":"76","author":[{"given":"Alejandra","family":"Godino\u2010Gimeno","sequence":"first","affiliation":[{"name":"Department of Fish Physiology and Biotechnology Instituto de Acuicultura de Torre de la Sal, IATS\u2010CSIC, Fish Neurobehaviour Lab  Castellon 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