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dc.contributor.authorSolberg, Monica F.eng
dc.contributor.authorKvamme, Bjørn Olaveng
dc.contributor.authorNilsen, Frankeng
dc.contributor.authorGlover, Kevineng
dc.PublishedBMC Research Notes 2012, 5:672eng
dc.description.abstractBackground: Ten generations of domestication selection has caused farmed Atlantic salmon Salmo salar L. to deviate from wild salmon in a range of traits. Each year hundreds of thousands of farmed salmon escape into the wild. Thus, interbreeding between farmed escapees and wild conspecifics represents a significant threat to the genetic integrity of wild salmon populations. In a previous study we demonstrated how domestication has inadvertently selected for reduced responsiveness to stress in farmed salmon. To complement that study, we have evaluated the expression of seven stress-related genes in head kidney of salmon of farmed, hybrid and wild origin exposed to environmentally induced stress. Results: In general, the crowding stressor used to induce environmental stress did not have a strong impact on mRNA expression levels of the seven genes, except for insulin-like growth factor-1 (IGF-1) that was downregulated in the stress treatment relative to the control treatment. mRNA expression levels of glutathione reductase (GR), Cu/Zn superoxide dismutase (Cu/Zn SOD), Mn superoxide dismutase (Mn SOD), glutathione peroxidase (GP) and IGF-1 were affected by genetic origin, thus expressed significantly different between the salmon of farmed, hybrid or wild origin. A positive relationship was detected between body size of wild salmon and mRNA expression level of the IGF-1 gene, in both environments. No such relationship was observed for the hybrid or farmed salmon. Conclusion: Farmed salmon in this study displayed significantly elevated mRNA levels of the IGF-1 gene relative to the wild salmon, in both treatments, while hybrids displayed a non additive pattern of inheritance. As IGF-1 mRNA levels are positively correlated to growth rate, the observed positive relationship between body size and IGF-1 mRNA levels detected in the wild but neither in the farmed nor the hybrid salmon, could indicate that growth selection has increased IGF-1 levels in farmed salmon to the extent that they may not be limiting growth rate.en_US
dc.publisherBioMed Centralen_US
dc.rightsAttribution CC BYeng
dc.subjectAtlantic salmoneng
dc.subjectFarmed escapeeseng
dc.subjectmRNA leveeng
dc.subjectInsulin-like growth factoreng
dc.subjectOxidative stresseng
dc.subjectNon additive inheritanceeng
dc.titleEffects of environmental stress on mRNA expression levels of seven genes related to oxidative stress and growth in Atlantic salmon Salmo salar L. of farmed, hybrid and wild originen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2012 Solberg et al.; licensee BioMed Central Ltd.en_US
dc.source.journalBMC Research Notes

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