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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Evolutionary functional elaboration of the Elovl2/5 gene family in chordates
Author(s): Monroig, Oscar
Lopes-Marques, Mónica
Navarro, Juan Carlos
Hontoria, Francisco
Ruvio, Raquel
Santos, Miguel
Venkatesh, Byrappa
Tocher, Douglas R
Costa Castro, Luıs Filipe
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Keywords: Chordates
Long-chain polyunsaturated fatty acids
Issue Date: 9-Feb-2016
Date Deposited: 24-Feb-2016
Citation: Monroig O, Lopes-Marques M, Navarro JC, Hontoria F, Ruvio R, Santos M, Venkatesh B, Tocher DR & Costa Castro LF (2016) Evolutionary functional elaboration of the Elovl2/5 gene family in chordates. Scientific Reports, 6, Art. No.: 20510.
Abstract: The biosynthesis of long-chain polyunsaturated fatty acids (LC-PUFA) provides an intriguing example on how multi-enzymatic cascades evolve. Essential LC-PUFA, such as arachidonic, eicosapentaenoic, and docosahexaenoic acids (DHA), can be acquired from the diet but are also endogenously retailored from C18 precursors through consecutive elongations and desaturations catalyzed, respectively, by fatty acyl elongase and desaturase enzymes. The molecular wiring of this enzymatic pathway de nes the ability of a species to biosynthesize LC-PUFA. Exactly when and how in animal evolution a functional LC-PUFA pathway emerged is still elusive. Here we examine key components of the LC-PUFA cascade, the Elovl2/Elovl5 elongases, from amphioxus, an invertebrate chordate, the sea lamprey, a representative of agnathans, and the elephant shark, a basal jawed vertebrate. We show that Elovl2 and Elovl5 emerged from genome duplications in vertebrate ancestry. The single Elovl2/5 from amphioxus e ciently elongates C18 and C20 and, to a marked lesser extent, C22 LC-PUFA. Lamprey is incapable of elongating C22 substrates. The elephant shark Elovl2 showed that the ability to e ciently elongate C22 PUFA and thus to synthesize DHA through the Sprecher pathway, emerged in the jawed vertebrate ancestor. Our ndings illustrate how non-integrated “metabolic islands” evolve into fully wired pathways upon duplication and neofunctionalization.
DOI Link: 10.1038/srep20510
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