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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Molecular and functional characterization of a fads2 orthologue in the Amazonian teleost, Arapaima gigas (Forthcoming)
Authors: Lopes-Marques, Mónica
Ozório, Rodrigo
Amaral, Ricardo
Tocher, Douglas R
Monroig, Oscar
Costa, Castro Luıs Filipe
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Keywords: Arapaima gigas
Fatty acid desaturase (Fads)
Long-chain polyunsaturated fatty acids (LC-PUFAs)
teleosts, evolution
Issue Date: 2016
Publisher: Elsevier
Citation: Lopes-Marques M, Ozório R, Amaral R, Tocher DR, Monroig O & Costa Castro LF Molecular and functional characterization of a fads2 orthologue in the Amazonian teleost, Arapaima gigas (Forthcoming), Comparative Biochemistry and Physiology - Part B: Biochemistry and Molecular Biology.
Abstract: The Brazilian teleost Arapaima gigas is an iconic species of the Amazon. In recent years a significant effort has been put into the farming of arapaima to mitigate overfishing threats. However, little is known regarding the nutritional requirements of A. gigas in particular those for essential fatty acids including the long-chain polyunsaturated fatty acids (LC-PUFA) eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). The ability to biosynthesize LC-PUFA is dependent upon the gene repertoire of fatty acyl desaturases (Fads) and elongases (Elovl), as well as their fatty acid specificities. In the present study we characterized both molecularly and functionally an orthologue of the desaturase fatty acid desaturase 2 (fads2) from A. gigas. The isolated sequence displayed the typical desaturase features, a cytochrome b5-domain with the heme-binding motif, two transmembrane domains and three histidine-rich regions. Functional characterization of A. gigas fads2 showed that, similar to other teleosts, the A. gigas fads2 exhibited a predominant Δ6 activity complemented with some capacity for Δ8 desaturation. Given that A. gigas belongs to one of the oldest teleostei lineages, the Osteoglossomorpha, these findings offer a significant insight into the evolution LC-PUFA biosynthesis in teleosts.
Type: Journal Article
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.
Affiliation: University of Porto
University of Porto
Federal University of Goias
Complex Systems
University of Porto

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