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Cardona E, Segret E, Heraud C, Roy J, Vigor C, Gros V, Reversat G, Sancho-Zubeldia B, Oger C, Durbec A, Bertrand-Michel J, Surget A, Galano JM, Corraze G, Cachelou Y, Marchand Y, Durand T, Cachelou F, Skiba-Cassy S. Adverse effects of excessive dietary arachidonic acid on survival, PUFA-derived enzymatic and non-enzymatic oxylipins, stress response in rainbow trout fry. Sci Rep 2024; 14:12376. [PMID: 38811794 PMCID: PMC11137042 DOI: 10.1038/s41598-024-63173-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 05/27/2024] [Indexed: 05/31/2024] Open
Abstract
Arachidonic acid (C20: 4n-6, AA) plays a fundamental role in fish physiology, influencing growth, survival and stress resistance. However, imbalances in dietary AA can have detrimental effects on fish health and performance. Optimal AA requirements for rainbow trout have not been established. This study aimed to elucidate the effects of varying dietary AA levels on survival, growth, long-chain polyunsaturated fatty acid (LC-PUFA) biosynthetic capacity, oxylipin profiles, lipid peroxidation, and stress resistance of rainbow trout fry. Over a period of eight weeks, 4000 female rainbow trout fry at the resorptive stage (0.12 g) from their first feeding were fed diets with varying levels of AA (0.6%, 1.1% or 2.5% of total fatty acids) while survival and growth metrics were closely monitored. The dietary trial was followed by an acute confinement stress test. Notably, while the fatty acid profiles of the fish reflected dietary intake, those fed an AA-0.6% diet showed increased expression of elongase5, highlighting their inherent ability to produce LC-PUFAs from C18 PUFAs and suggesting potential AA or docosapentaenoic acidn-6 (DPAn-6) biosynthesis. However, even with this biosynthetic capacity, the trout fed reduced dietary AA had higher mortality rates. The diet had no effect on final weight (3.38 g on average for the three diets). Conversely, increased dietary AA enhanced eicosanoid production from AA, suggesting potential inflammatory and oxidative consequences. This was further evidenced by an increase in non-enzymatic lipid oxidation metabolites, particularly in the AA-2.5% diet group, which had higher levels of phytoprostanes and isoprostanes, markers of cellular oxidative damage. Importantly, the AA-1.1% diet proved to be particularly beneficial for stress resilience. This was evidenced by higher post-stress turnover rates of serotonin and dopamine, neurotransmitters central to the fish's stress response. In conclusion, a dietary AA intake of 1.1% of total fatty acids appears to promote overall resilience in rainbow trout fry.
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Affiliation(s)
- Emilie Cardona
- Viviers de Rébénacq, 64260, Rébénacq, France.
- INRAE, Univ. Pau & Pays Adour, E2S UPPA, NUMEA, 64310, Saint Pée-sur-Nivelle, France.
| | | | - Cécile Heraud
- INRAE, Univ. Pau & Pays Adour, E2S UPPA, NUMEA, 64310, Saint Pée-sur-Nivelle, France
| | - Jerome Roy
- INRAE, Univ. Pau & Pays Adour, E2S UPPA, NUMEA, 64310, Saint Pée-sur-Nivelle, France
| | - Claire Vigor
- Institut des Biomolécules Max Mousseron (IBMM), Pôle Chimie Balard Recherche, UMR5247, CNRS, Université de Montpellier, ENSCM, 34293, Montpellier, France
| | - Valérie Gros
- Institut des Biomolécules Max Mousseron (IBMM), Pôle Chimie Balard Recherche, UMR5247, CNRS, Université de Montpellier, ENSCM, 34293, Montpellier, France
| | - Guillaume Reversat
- Institut des Biomolécules Max Mousseron (IBMM), Pôle Chimie Balard Recherche, UMR5247, CNRS, Université de Montpellier, ENSCM, 34293, Montpellier, France
| | | | - Camille Oger
- Institut des Biomolécules Max Mousseron (IBMM), Pôle Chimie Balard Recherche, UMR5247, CNRS, Université de Montpellier, ENSCM, 34293, Montpellier, France
| | - Anaelle Durbec
- I2MC, Université de Toulouse, Inserm, Université Toulouse III - Paul Sabatier (UPS), Toulouse, France
- MetaboHUB-MetaToul, National Infrastructure of Metabolomics and Fluxomics, 31077, Toulouse, France
| | - Justine Bertrand-Michel
- I2MC, Université de Toulouse, Inserm, Université Toulouse III - Paul Sabatier (UPS), Toulouse, France
- MetaboHUB-MetaToul, National Infrastructure of Metabolomics and Fluxomics, 31077, Toulouse, France
| | - Anne Surget
- INRAE, Univ. Pau & Pays Adour, E2S UPPA, NUMEA, 64310, Saint Pée-sur-Nivelle, France
| | - Jean-Marie Galano
- Institut des Biomolécules Max Mousseron (IBMM), Pôle Chimie Balard Recherche, UMR5247, CNRS, Université de Montpellier, ENSCM, 34293, Montpellier, France
| | - Geneviève Corraze
- INRAE, Univ. Pau & Pays Adour, E2S UPPA, NUMEA, 64310, Saint Pée-sur-Nivelle, France
| | | | | | - Thierry Durand
- Institut des Biomolécules Max Mousseron (IBMM), Pôle Chimie Balard Recherche, UMR5247, CNRS, Université de Montpellier, ENSCM, 34293, Montpellier, France
| | | | - Sandrine Skiba-Cassy
- INRAE, Univ. Pau & Pays Adour, E2S UPPA, NUMEA, 64310, Saint Pée-sur-Nivelle, France
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Harshini V, Shukla N, Raval I, Kumar S, Shrivastava V, Chaudhari A, Patel AK, Joshi CG. Interplay of gene expression and regulators under salinity stress in gill of Labeo rohita. BMC Genomics 2023; 24:336. [PMID: 37337199 DOI: 10.1186/s12864-023-09426-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 06/02/2023] [Indexed: 06/21/2023] Open
Abstract
BACKGROUND Labeo rohita is the most preferred freshwater carp species in India. The concern of increasing salinity concentration in freshwater bodies due to climate change may greatly impact the aquatic environment. Gills are one of the important osmoregulatory organs and have direct contact with external environment. Hence, the current study is conducted to understand the gill transcriptomic response of L. rohita under hypersalinity environment. RESULTS Comprehensive analysis of differentially expressed long non-coding RNAs (lncRNAs), microRNAs (miRNAs) and mRNAs was performed in gills of L. rohita treated with 2, 4, 6 and 8ppt salinity concentrations. Networks of lncRNA-miRNA-mRNA revealed involvement of 20, 33, 52 and 61 differentially expressed lncRNAs, 11, 13, 26 and 21 differentially expressed miRNAs in 2, 4, 6 and 8ppt groups between control and treatment respectively. These lncRNA-miRNA pairs were regulating 87, 214, 499 and 435 differentially expressed mRNAs (DE mRNAs) in 2, 4, 6 and 8ppt treatments respectively. Functional analysis of these genes showed enrichment in pathways related to ion transportation and osmolyte production to cope with induced osmotic pressure due to high salt concentration. Pathways related to signal transduction (MAPK, FOXO and phosphatidylinositol signaling), and environmental information processing were also upregulated under hypersalinity. Energy metabolism and innate immune response pathways also appear to be regulated. Protein turnover was high at 8ppt as evidenced by enrichment of the proteasome and aminoacyl tRNA synthesis pathways, along with other enriched KEGG terms such as apoptosis, cellular senescence and cell cycle. CONCLUSION Altogether, the RNA-seq analysis provided valuable insights into competitive endogenous (lncRNA-miRNA-mRNA) regulatory network of L. rohita under salinity stress. L. rohita is adapting to the salinity stress by means of upregulating protein turnover, osmolyte production and removing the damaged cells using apoptotic pathway and regulating the cell growth and hence diverting the essential energy for coping with salinity stress.
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Affiliation(s)
- Vemula Harshini
- Gujarat Biotechnology Research Centre, Sector 11, Gandhinagar, 382010, Gujarat, India
| | - Nitin Shukla
- Gujarat Biotechnology Research Centre, Sector 11, Gandhinagar, 382010, Gujarat, India
| | - Ishan Raval
- Gujarat Biotechnology Research Centre, Sector 11, Gandhinagar, 382010, Gujarat, India
| | - Sujit Kumar
- Postgraduate Institute of Fisheries Education and Research, Kamdhenu University, Himmatnagar, 383010, Gujarat, India
| | - Vivek Shrivastava
- Postgraduate Institute of Fisheries Education and Research, Kamdhenu University, Himmatnagar, 383010, Gujarat, India
| | - Aparna Chaudhari
- Central Institute of Fisheries Education, Mumbai, 400061, Maharashtra, India
| | - Amrutlal K Patel
- Gujarat Biotechnology Research Centre, Sector 11, Gandhinagar, 382010, Gujarat, India.
| | - Chaitanya G Joshi
- Gujarat Biotechnology Research Centre, Sector 11, Gandhinagar, 382010, Gujarat, India.
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Evaluation of Dicentrarchus labrax Meats and the Vegetable Quality of Beta vulgaris var. cicla Farmed in Freshwater and Saltwater Aquaponic Systems. WATER 2016. [DOI: 10.3390/w8100423] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Montero D, Terova G, Rimoldi S, Tort L, Negrin D, Zamorano MJ, Izquierdo M. Modulation of adrenocorticotrophin hormone (ACTH)-induced expression of stress-related genes by PUFA in inter-renal cells from European sea bass (Dicentrarchus labrax). J Nutr Sci 2015; 4:e16. [PMID: 26090096 PMCID: PMC4463938 DOI: 10.1017/jns.2015.6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 09/11/2014] [Accepted: 01/05/2015] [Indexed: 01/29/2023] Open
Abstract
Dietary fatty acids have been shown to exert a clear effect on the stress response, modulating the release of cortisol. The role of fatty acids on the expression of steroidogenic genes has been described in mammals, but little is known in fish. The effect of different fatty acids on the release of cortisol and expression of stress-related genes of European sea bass (Dicentrarchus labrax) head kidney, induced by a pulse of adenocorticotrophin hormone (ACTH), was studied. Tissue was maintained in superfusion with 60 min of incubation with EPA, DHA, arachidonic acid (ARA), linoleic acid or α-linolenic acid (ALA) during 490 min. Cortisol was measured by RIA. The quantification of stress-related genes transcripts was conducted by One-Step TaqMan real-time RT-PCR. There was an effect of the type of fatty acid on the ACTH-induced release of cortisol, values from ALA treatment being elevated within all of the experimental period. The expression of some steroidogenic genes, such as the steroidogenic acute regulatory protein (StAR) and c-fos, were affected by fatty acids, ALA increasing the expression of StAR after 1 h of ACTH stimulation whereas DHA, ARA and ALA increased the expression of c-fos after 20 min. ARA increased expression of the 11β-hydroxylase gene. Expression of heat shock protein 70 (HSP70) was increased in all the experimental treatments except for ARA. Results corroborate previous studies of the effect of different fatty acids on the release of cortisol in marine fish and demonstrate that those effects are mediated by alteration of the expression of steroidogenic genes.
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Key Words
- ACTH, adrenocorticotrophin hormone
- ALA, α-linolenic acid
- ARA, arachidonic acid
- Adrenocorticotrophin hormone-induced stress response
- COX, cyclo-oxygenase
- CYP11b, cytochrome P450 11β
- Dicentrarchus labrax
- Fatty acids
- GR, glucocorticoid receptor
- HSP, heat shock protein
- LA, linoleic acid
- LOX, lipo-oxygenase
- Nutritional modulation of steroidogenesis
- PKA, protein kinase A
- PLA2, phospholipase A2
- StAR, steroidogenic acute regulatory protein
- Stress-related gene expression
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Affiliation(s)
- Daniel Montero
- Universidad de Las Palmas de Gran Canaria
(ULPGC), Grupo de Investigación en acuicultura (GIA),
Instituto Universitario de Sanidad Animal y Seguridad Alimentaria
(IUSA), c/ Transmontaña, s/n,
35413, Arucas, Las
Palmas, Canary Islands, Spain
| | - Genciana Terova
- University of Insubria,
Department of Biotechnology and Life Sciences, Via
Dunant, 3-21100 Varese, Italy
| | - Simona Rimoldi
- University of Insubria,
Department of Biotechnology and Life Sciences, Via
Dunant, 3-21100 Varese, Italy
| | - Lluis Tort
- Universitat Autonoma de Barcelona,
Department de Biologia Cel.lular, Fisiologia i
immunologia, Edifici M. 08193,
Bellaterra, Cerdanyola del Vallès,
Barcelona, Spain
| | - Davinia Negrin
- Universidad de Las Palmas de Gran Canaria
(ULPGC), Grupo de Investigación en acuicultura (GIA),
Instituto Universitario de Sanidad Animal y Seguridad Alimentaria
(IUSA), c/ Transmontaña, s/n,
35413, Arucas, Las
Palmas, Canary Islands, Spain
| | - María Jesús Zamorano
- Universidad de Las Palmas de Gran Canaria
(ULPGC), Grupo de Investigación en acuicultura (GIA),
Instituto Universitario de Sanidad Animal y Seguridad Alimentaria
(IUSA), c/ Transmontaña, s/n,
35413, Arucas, Las
Palmas, Canary Islands, Spain
| | - Marisol Izquierdo
- Universidad de Las Palmas de Gran Canaria
(ULPGC), Grupo de Investigación en acuicultura (GIA),
Instituto Universitario de Sanidad Animal y Seguridad Alimentaria
(IUSA), c/ Transmontaña, s/n,
35413, Arucas, Las
Palmas, Canary Islands, Spain
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The effect of dietary arachidonic acid (ARA) on growth performance, fatty acid composition and expression of ARA metabolism-related genes in larval half-smooth tongue sole (Cynoglossus semilaevis). Br J Nutr 2015; 113:1518-30. [DOI: 10.1017/s0007114515000781] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The present study was conducted to investigate the effects of dietary arachidonic acid (ARA) on growth performance, fatty acid composition and ARA metabolism-related gene expression in larval half-smooth tongue sole (Cynoglossus semilaevis). Larvae (35 d after hatching, 54 (sem 1) mg) were fed diets with graded concentrations of ARA (0·01, 0·39, 0·70, 1·07, 1·42 and 2·86 % dry weight) five times per d to apparent satiation for 30 d. Results showed that increased dietary ARA concentration caused a significant non-linear rise to a plateau in survival rate, final body weight and thermal growth coefficient, and the maximum values occurred with the 1·42 % ARA treatment. As dietary ARA increased to 1·07 or 1·42 %, activities of trypsin, leucine aminopeptidase and alkaline phosphatase levels increased, but they decreased with higher ARA concentrations. The fatty acid composition of tongue sole larvae was almost well correlated with their dietary fatty acid profiles, and the EPA content of the larvae decreased with increasing dietary ARA. Meanwhile, the partial sequences of COX-1a (cyclo-oxygenase-1a), COX-1b (cyclo-oxygenase-1b), COX-2 (cyclo-oxygenase-2), 5-LOX (5-lipoxygenase) and CYP2J6-like (cytochrome P450 2J6-like) were also obtained. Both COX-2 and 5-LOX mRNA expression levels significantly increased to a plateau in an ‘L’-shaped manner as dietary ARA increased to 1·07 or 1·42 %, but no significant differences were found in the gene expression of COX-1a, COX-1b or CYP2J6-like. These results suggest that 1·07–1·42 % dietary ARA was beneficial to the growth performance of larval tongue sole, and the regulation of dietary ARA on the growth performance of larvae was probably involved in altering the mRNA expression of COX-2 and 5-LOX.
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Zueva KJ, Lumme J, Veselov AE, Kent MP, Lien S, Primmer CR. Footprints of directional selection in wild Atlantic salmon populations: evidence for parasite-driven evolution? PLoS One 2014; 9:e91672. [PMID: 24670947 PMCID: PMC3966780 DOI: 10.1371/journal.pone.0091672] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 02/14/2014] [Indexed: 12/15/2022] Open
Abstract
Mechanisms of host-parasite co-adaptation have long been of interest in evolutionary biology; however, determining the genetic basis of parasite resistance has been challenging. Current advances in genome technologies provide new opportunities for obtaining a genome-scale view of the action of parasite-driven natural selection in wild populations and thus facilitate the search for specific genomic regions underlying inter-population differences in pathogen response. European populations of Atlantic salmon (Salmo salar L.) exhibit natural variance in susceptibility levels to the ectoparasite Gyrodactylus salaris Malmberg 1957, ranging from resistance to extreme susceptibility, and are therefore a good model for studying the evolution of virulence and resistance. However, distinguishing the molecular signatures of genetic drift and environment-associated selection in small populations such as land-locked Atlantic salmon populations presents a challenge, specifically in the search for pathogen-driven selection. We used a novel genome-scan analysis approach that enabled us to i) identify signals of selection in salmon populations affected by varying levels of genetic drift and ii) separate potentially selected loci into the categories of pathogen (G. salaris)-driven selection and selection acting upon other environmental characteristics. A total of 4631 single nucleotide polymorphisms (SNPs) were screened in Atlantic salmon from 12 different northern European populations. We identified three genomic regions potentially affected by parasite-driven selection, as well as three regions presumably affected by salinity-driven directional selection. Functional annotation of candidate SNPs is consistent with the role of the detected genomic regions in immune defence and, implicitly, in osmoregulation. These results provide new insights into the genetic basis of pathogen susceptibility in Atlantic salmon and will enable future searches for the specific genes involved.
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Affiliation(s)
- Ksenia J. Zueva
- Department of Biology, University of Turku, Turku, Finland
- * E-mail:
| | - Jaakko Lumme
- Department of Biology, University of Oulu, Oulu, Finland
| | - Alexey E. Veselov
- Institute of Biology, Karelian Research Centre of RAS, Petrozavodsk, Russia
| | - Matthew P. Kent
- Centre for Integrative Genetics (CIGENE) and Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Ås, Norway
| | - Sigbjørn Lien
- Centre for Integrative Genetics (CIGENE) and Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Ås, Norway
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Chang YM, Tang R, Dou XJ, Tao R, Sun XW, Liang LQ. Transcriptome and expression profiling analysis of Leuciscus waleckii: an exploration of the alkali-adapted mechanisms of a freshwater teleost. MOLECULAR BIOSYSTEMS 2014; 10:491-504. [PMID: 24382597 DOI: 10.1039/c3mb70318e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The strategies by which freshwater teleosts maintain acid-base homeostasis under alkaline stress are attractive and have been explored for a long time. In this study, a cyprinid fish that tolerates extremely alkaline environments (pH 9.6), Leuciscus waleckii, was used as a model to explore the molecular mechanisms of acid-base regulation. Using a lab-controlled alkaline challenge test and 454 sequencing, the transcriptomes of their gills and kidney were profiled and compared. mRNA profiling produced 1 826 022 reads, generated 30 606 contigs with an average length of 1022 bp, of which 19 196 were annotated successfully. Comparative analysis of the expression profiles between alkaline and freshwater L. waleckii habitats revealed approximately 4647 and 7184 genes that were differentially expressed (p < 0.05) in gills and kidney, respectively, of which 2398 and 5127 had more than twofold changes in expression. Gene ontology analysis and KEGG enrichment analysis were conducted. Comprehensive analysis found that genes involved in ion transportation, ammonia transportation, and arachidonic acid metabolism pathways changed dramatically and played important roles in acid-base homeostasis in fish under alkaline stress. These results support the existing hypotheses about candidate genes involved in acid-base regulation under alkaline stress and prompt several new hypotheses. The large transcriptome dataset collected in this study is a useful resource for the exploration of homeostasis modulation in other fish species.
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Affiliation(s)
- Yu-Mei Chang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Rd 43 Songfa, Daoli District, Harbin 150070, China.
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Martins DA, Rocha F, Castanheira F, Mendes A, Pousão-Ferreira P, Bandarra N, Coutinho J, Morais S, Yúfera M, Conceição LEC, Martínez-Rodríguez G. Effects of dietary arachidonic acid on cortisol production and gene expression in stress response in Senegalese sole (Solea senegalensis) post-larvae. FISH PHYSIOLOGY AND BIOCHEMISTRY 2013; 39:1223-1238. [PMID: 23443720 DOI: 10.1007/s10695-013-9778-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 02/18/2013] [Indexed: 06/01/2023]
Abstract
Dietary fatty acids, particularly arachidonic acid (ARA), affect cortisol and may influence the expression of genes involved in stress response in fish. The involvement of ARA on stress, lipid, and eicosanoid metabolism genes, in Senegalese sole, was tested. Post-larvae were fed Artemia presenting graded ARA levels (0.1, 0.4, 0.8, 1.7, and 2.3%, dry matter basis), from 22 to 35 days after hatch. Whole-body cortisol levels were determined, before and 3 h after a 2 min air exposure, as well as the expression of phospholipase A2 (PLA 2 ), cyclooxygenase-2 (COX-2), steroidogenic acute regulatory protein (StAR), glucocorticoid receptors (GRs), phosphoenolpyruvate carboxykinase (PEPCK), and peroxisome proliferator-activated receptor alpha (PPARα). Relative growth rate (6.0-7.8% day(-1)) and survival at the end of the experiment (91-96%) and after stress (100%) were unaffected. Fish reflected dietary ARA content and post-stress cortisol increased with ARA supply up to 1.7%, whereas 2.3% ARA seemed to enhance basal cortisol slightly and alter the response to stress. Results suggested that elevating StAR transcription might not be necessary for a short-term response to acute stress. Basal cortisol and PLA 2 expression were strongly correlated, indicating a potential role for this enzyme in steroidogenesis. Under basal conditions, larval ARA was associated with GR1 expression, whereas the glucocorticoid responsive gene PEPCK was strongly related with cortisol but not GR1 mRNA levels, suggesting the latter might not reflect the amount of GR1 protein in sole. Furthermore, a possible role for PPARα in the expression of PEPCK following acute stress is proposed.
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Affiliation(s)
- Dulce Alves Martins
- Centro de Ciências do Mar do Algarve, Universidade do Algarve, Campus de Gambelas, 8005-139, Faro, Portugal,
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Tanomman S, Ketudat-Cairns M, Jangprai A, Boonanuntanasarn S. Characterization of fatty acid delta-6 desaturase gene in Nile tilapia and heterogenous expression in Saccharomyces cerevisiae. Comp Biochem Physiol B Biochem Mol Biol 2013; 166:148-56. [PMID: 23939229 DOI: 10.1016/j.cbpb.2013.07.011] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 07/31/2013] [Accepted: 07/31/2013] [Indexed: 12/31/2022]
Abstract
Fatty acid delta-6 desaturase (fads2)-like gene from Nile tilapia (Oreochromis niloticus) was characterized and designated as oni-fads2. The Oni-FADS2 showed the typical structure of microsomal FADS2. The presence of oni-fads2 transcripts in unfertilized eggs demonstrated the maternal role of Nile tilapia in providing the oni-fads2 transcript in their eggs. In addition, the expression of oni-fads2 was detectable in embryos throughout the hatching stage. Real-time reverse transcription-PCR revealed that oni-fads2 was expressed at a high level in all the brain regions, liver, and testis. Recombinant yeast (RY) was generated by transformation of Saccharomyces cerevisiae with the plasmid containing oni-fads2 driven by the Gal1 promoter (pYoni-fads2). The conspicuous expression of RY was detectable by RT-PCR after induction with galactose for 24h. When RY was induced with galactose, it exhibited 39% and 7% of delta-6 desaturase (∆6) activity toward C18:2n6 and C18:3n3, respectively. Additionally, it displayed 4% of delta-5 desaturase (∆5) activity toward C20:3n6, indicating that Oni-FADS2 had ∆5 and ∆6 bifunction.
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Affiliation(s)
- Supamas Tanomman
- School of Animal Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, 111 University Avenue, Muang, Nakhon Ratchasima 30000, Thailand
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