Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/30912
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Central and peripheral clocks in Atlantic bluefin tuna (Thunnus thynnus, L.): Daily rhythmicity of hepatic lipid metabolism and digestive genes
Author(s): Betancor, Monica
Sprague, Matthew
Ortega, Aurelio
de la Gándara, Fernando
Tocher, Douglas
Ruth, Renata
Perkins, Eloise
Mourente, Gabriel
Contact Email: m.b.betancor@stir.ac.uk
Keywords: Bluefin tuna
Clock genes
Brain
Liver
Lipid metabolism
Digestive enzyme genes
Issue Date: 30-Jun-2020
Citation: Betancor M, Sprague M, Ortega A, de la Gándara F, Tocher D, Ruth R, Perkins E & Mourente G (2020) Central and peripheral clocks in Atlantic bluefin tuna (Thunnus thynnus, L.): Daily rhythmicity of hepatic lipid metabolism and digestive genes. Aquaculture, 523, Art. No.: 735220. https://doi.org/10.1016/j.aquaculture.2020.735220
Abstract: Atlantic bluefin tuna (ABT; Thunnus thynnus) is a highly regarded and consumed species, but farming is still in its infancy. Currently, nothing is known about the presence of circadian rhythmicity at central or peripheral tissues, or if there are daily rhythms in expression of genes involved in lipid metabolism. In order to elucidate clock gene regulation of genes of lipid metabolism in ABT, six clock genes (bmal1, clock, cry1, cry2, per1 and per2) were sequenced and 24 h expression of these genes determined in brain and liver of fish acclimated to a light:dark (L:D) photoperiod. Additionally, the daily expression of lipid metabolism and digestive enzyme genes in ABT was also determined in liver. All six clock genes displayed rhythmicity in the brain and liver, other than cry2, which did not show an acrophase in liver. In liver, all the transcription factors analysed other than srebp1 and srebp2 displayed rhythmicity, with lxr and pparα displaying diurnal expression, whereas pparγ was highly expressed at the end of the scotophase. Some of the target genes of lxr such as elovl5 and lpl also oscillated rhythmically, with acrophases during the photophase. In contrast, only three of the eight digestive enzyme genes studied displayed rhythmicity, at different times of the day, suggesting that either ABT display different feeding periods or the digestion of some nutrients (e.g. lipids) is prioritized over others. The present study showed that clock and lipid metabolism genes displayed strong daily rhythmicity in ABT brain and liver, which could be an area of considerable interest for the establishment of efficient feeding protocols in this new aquaculture species.  
DOI Link: 10.1016/j.aquaculture.2020.735220
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: Betancor M, Sprague M, Ortega A, de la Gándara F, Tocher D, Ruth R, Perkins E & Mourente G (2020) Central and peripheral clocks in Atlantic bluefin tuna (Thunnus thynnus, L.): Daily rhythmicity of hepatic lipid metabolism and digestive genes. Aquaculture, 523, Art. No.: 735220. DOI: https://doi.org/10.1016/j.aquaculture.2020.735220 © 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Licence URL(s): http://creativecommons.org/licenses/by-nc-nd/4.0/

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