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ABSTRACT: Flesh coloration on Atlantic salmon

PROVIDER: PRJNA706530 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13854900.fastq.gz	Fastqsanger.gz
	SRR13854901.fastq.gz	Fastqsanger.gz
	SRR13854902.fastq.gz	Fastqsanger.gz
	SRR13854903.fastq.gz	Fastqsanger.gz
	SRR13854904.fastq.gz	Fastqsanger.gz

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Hepatic transcriptomic analysis of inter-family variability in flesh n-3 long-chain polyunsaturated fatty acid content in Atlantic salmon

Project description:Liver transcriptomes of Atlantic salmon families with contrasting flesh n-3 LC-PUFA profiles, and all fed the same 100% vegetable oil replacement diet, were compared by microarray analysis (Agilent oligoarray platform). The objective was to identify gene pathways and molecular mechanisms which might explain differences in flesh n-3 LC-PUFA content, independent of total lipid deposition, when salmon families are fed the same LC-PUFA deficient diet. A factorial design was chosen in which families containing higher and lower n-3 LC-PUFA relative levels were compared at similar total lipid percentages in flesh.

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Project description:The natural food for Atlantic salmon (Salmo salar) in freshwater has relatively lower levels of omega-3 (n-3) long-chain polyunsaturated fatty acids (LC-PUFA) than found in prey for post-smolt salmon in seawater. Land-locked salmon such as the GullspÃ¥ng population feed exclusively on freshwater type lipids during its entire life cycle, a successful adaptation derived from divergent evolution. Studying land-locked populations may provide insights into the molecular and genetic control mechanisms that determine and regulate n-3 LC-PUFA biosynthesis and retention in Atlantic salmon. A two factorial study was performed comparing land-locked and farmed salmon parr fed diets formulated with fish or rapeseed oil for 8 weeks. The land-locked parr had higher capacity to synthesise n-3 LC-PUFA as indicated by higher expression and activity of desaturase and elongase enzymes. The data suggested that the land-locked salmon had reduced sensitivity to dietary fatty acid composition and that dietary docosahexaenoic acid (DHA) did not appear to suppress expression of LC-PUFA biosynthetic genes or activity of the biosynthesis pathway, probably an evolutionary adaptation to a natural diet lower in DHA. Increased biosynthetic activity did not translate to enhanced n-3 LC-PUFA contents in the flesh and diet was the only factor affecting this parameter. Additionally, high lipogenic and glycolytic potentials were found in land-locked salmon, together with decreased lipolysis which in turn could indicate increased use of carbohydrates as an energy source and a sparing of lipid.

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