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Expression of genes of long-chain polyunsaturated fatty acid(LC-PUFA) biosynthesis during early embryogenesis in cobia Rachycentron canadum

Expression of genes of long-chain polyunsaturated fatty acid...

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The 14th International Symposium on Fish Nutrition & Feeding

作者： oscar monroig Ken Webb Leonardo Ibarra-Castro G.Joan Holt Douglas R.Tocher Institute of Aquaculture University of Stirling Marine Science Institute University of Texas at Austin

Developing organisms including fish have high requirements for long-chain polyunsaturated fatty acids(LC-PUFA) to fulfil the demands of critical tissues such as brain and retina,where these compounds accumulate in membrane *** recently investigated the activation of the LC-PUFA biosynthesis pathway in zebrafish embryos by analysing the expression of genes involved in the *** study revealed that zebrafish embryos express all the enzymatic activities required in the synthesis of LC-PUFA such as docosahexaenoic acid(DHA),and thus can supplement supply of preformed LC-PUFA from the yolk *** freshwater species, marine fish have been generally considered unable to biosynthesise LC-PUFA from C18 PUFA ***,little information is available on the biosynthetic capacity of early life stages of marine *** present study investigated the expression of genes encoding enzymes of the LC-PUFA biosynthetic pathway in the marine teleost cobia(Rachycentron canadum).First,an elongase with sequence similarity to mammalian very long-chain fatty acids 4(Elovl4) was isolated,and functional characterisation revealed it catalysed conversion of 22:5n-3 to 24:5n-3, which can be further desaturated and chain shortened to DHA,confirming its potential role in DHA *** activity of Elovl4 on 22:5n-3 produced pentaenes up to C36,suggesting a role in the synthesis of very long-chain PUFA(VLC-PUFA),which are fatty acids relatively abundant in specific tissues such as retina,testicles and ***,the temporal expression patterns of elovl4,together with the formerly characterised elongase elovl5 and fatty acyl desaturase△6fad,were analysed by RT-PCR in cobia embryos collected throughout early ontogeny up to 72 hours post-fertilisation(hpf).Interestingly,elovl4 exhibited increasing expression levels from 9 to 60 hpf,thus suggesting the biosynthesis of VLC-PUFA is activated early on in developing retina and brain as occurs with zebrafish

关键词： Cobia early embryogenesis Elovl4-like elongase Elovl5-like elongase fatty acid fatty acyl desaturase LC-PUFA biosynthesis

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