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Transcriptional regulation in salmonids with emphasis on lipid metabolism

in vitro and in vivo studies

Schiller Vestergren, AnnaLotta (2014). Transcriptional regulation in salmonids with emphasis on lipid metabolism. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2014:89
ISBN 978-91-576-8126-3
eISBN 978-91-576-8127-0
[Doctoral thesis]

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Fish is a vital source of valuable omega-3 (n-3) fatty acids (FA) in the human diet. With declining commercial fisheries, aquaculture fish constitute a growing proportion of human consumption. Sustainable development of aquaculture requires that the fish feed used is not solely based on fish meal and oil (FO), but also contains increasing levels of vegetable oil (VO). The replacement of FO with VO influences FA composition in fish tissues by decreasing n-3 long-chain polyunsaturated fatty acids (LCPUFAs) and the nutritional value for humans. Accordingly, the last decade of salmonid research has focused on increasing the amount of n-3 LCPUFAs in fish fed VO diets e.g. addition of bioactive compounds. This thesis examined the potential effects of bioactive compounds on lipid metabolism in salmonids.

Genes involved in transcriptional regulation, uptake, β-oxidation, elongation and desaturation were shown to be affected by addition of bioactive compounds in both in vivo and in vitro experiments. Effects on FA composition were also observed, but no clear effect on docosahexaenoic acid (DHA) content.

The discrepancies between increased gene expression of target genes in the desaturation and elongation cascade and the actual lack of response in FA content of eicosapentaenoic acid and docosahexaenoic acid may be the result of a combination of feedback regulation and post-transcriptional regulation, such as RNA silencing through microRNA (miRNA) repression.

This thesis describes the miRNA transcriptome in liver tissue of Atlantic salmon post-smoltification and the tissue distribution of selected miRNAs in nine different somatic tissues of juvenile Atlantic salmon (Salmo salar) for the first time. The results expand the number of known Atlantic salmon miRNAs and provide a framework for understanding the n-3 LCPUFA pathway in Atlantic salmon.

Authors/Creators:Schiller Vestergren, AnnaLotta
Title:Transcriptional regulation in salmonids with emphasis on lipid metabolism
Subtitle:in vitro and in vivo studies
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2014
Depositing date:13 November 2014
Number of Pages:119
I.Vestergren, A.L.S., Trattner, S., Pan, J., Johnsson, P., Kamal-Eldin, A., Brännäs, E., Moazzami, A.A., Pickova, J. (2013). The effect of combining linseed oil and sesamin on the fatty acid composition in white muscle and on expression of lipid-related genes in white muscle and liver of rainbow trout (Oncorhynchus mykiss). Aquaculture International 21(4) 843-859.
II.Schiller Vestergren, A., Wagner, L., Pickova, J., Rosenlund, G., Kamal-Eldin, A., Trattner, S. (2012). Sesamin modulates gene expression without corresponding effect on fatty acids in Atlantic salmon (Salmo salar L.). Lipids 47(9), 897-911.
III.Schiller Vestergren, A., Trattner, S., Mráz, J. Ruyter, B., Pickova, J. (2011). Fatty acids and gene expression responses to bioactive compounds in Atlantic salmon (Salmo salar L.) hepatocytes. Neuroendocrinology Letters 32(Suppl. 2), 41-50.
IV.Trattner, S., Vestergren A.S. (2013). Tissue distribution of selected microRNA in Atlantic salmon. European Journal of Lipid Science and Technology 115(12), 1348-1356.
V.Schiller Vestergren, A., Trattner, S., Pickova, J. Hepatic microRNA Profile in mature Atlantic salmon (Salmo salar L.) (manuscript submitted).
Place of Publication:Uppsala
Publisher:Department of Food Science, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8126-3
ISBN for electronic version:978-91-576-8127-0
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L10 Animal genetics and breeding
L Animal production > L50 Animal physiology and biochemistry
Q Food science > Q54 Feed composition
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Biochemistry and Molecular Biology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Genetics (medical genetics to be 30107 and agricultural genetics to be 40402)
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Food Science
Agrovoc terms:oncorhynchus mykiss, salmo salar, atlantic salmon, fish feeding, fish, lipids, lipid metabolism, genes, gene expression, rna, transcription factors, oxidation
Keywords:β-oxidation, desaturation, elongation, isomiR, microRNA, Oncorhynchus mykiss, Salmo salar, transcription factors
Permanent URL:
ID Code:11648
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Food Science (until 161231)
Deposited By: Ms AnnaLotta Schiller Vestergren
Deposited On:13 Nov 2014 12:46
Metadata Last Modified:02 Dec 2014 11:09

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