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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Conservation of lipid metabolic gene transcriptional regulatory networks in fish and mammals
Author(s): Carmona-Antonanzas, Greta
Tocher, Douglas R
Martinez-Rubio, Laura
Leaver, Michael
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Keywords: Atlantic salmon
Fatty acid
Gene expression
Pyloric caeca
Transcription factor
Issue Date: Jan-2014
Citation: Carmona-Antonanzas G, Tocher DR, Martinez-Rubio L & Leaver M (2014) Conservation of lipid metabolic gene transcriptional regulatory networks in fish and mammals. Gene, 534 (1), pp. 1-9.
Abstract: Lipid content and composition in aquafeeds have changed rapidly as a result of the recent drive to replace eco- logically limited marine ingredients, fishmeal and fish oil (FO). Terrestrial plant products are the most economic and sustainable alternative; however, plant meals and oils are devoid of physiologically important cholesterol and long-chain polyunsaturated fatty acids (LC-PUFA), eicosapentaenoic (EPA), docosahexaenoic (DHA) and arachidonic (ARA) acids. Although replacement of dietary FO with vegetable oil (VO) has little effect on growth in Atlantic salmon (Salmo salar), several studies have shown major effects on the activity and expression of genes involved in lipid homeostasis. In vertebrates, sterols and LC-PUFA play crucial roles in lipid metabolism by direct interaction with lipid-sensing transcription factors (TFs) and consequent regulation of target genes. The primary aim of the present study was to elucidate the role of key TFs in the transcriptional regulation of lipid metabolism in fish by transfection and overexpression of TFs. The results show that the expression of genes of LC-PUFA biosynthesis (elovl and fads2) and cholesterol metabolism (abca1) are regulated by Lxr and Srebp TFs in salmon, indicating highly conserved regulatory mechanism across vertebrates. In addition, srebp1 and srebp2 mRNA respond to replacement of dietary FO with VO. Thus, Atlantic salmon adjust lipid metabolism in response to dietary lipid composition through the transcriptional regulation of gene expression. It may be possible to further increase efficient and effective use of sustainable alternatives to marine products in aquaculture by considering these important molecular interactions when formulating diets.
DOI Link: 10.1016/j.gene.2013.10.040
Rights: Published in Gene by Elsevier; Elsevier believes that individual authors should be able to distribute their accepted author manuscripts for their personal voluntary needs and interests, e.g. posting to their websites or their institution’s repository, e-mailing to colleagues. The Elsevier Policy is as follows: Authors retain the right to use the accepted author manuscript for personal use, internal institutional use and for permitted scholarly posting provided that these are not for purposes of commercial use or systematic distribution. An "accepted author manuscript" is the author’s version of the manuscript of an article that has been accepted for publication and which may include any author-incorporated changes suggested through the processes of submission processing, peer review, and editor-author communications.

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