Effects 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 origin
Abstract Background 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 r...
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ftbiomed:oai:biomedcentral.com:1756-0500-5-672 2023-05-15T15:31:29+02:00 Effects 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 origin Solberg, Monica F Kvamme, Bjørn Olav Nilsen, Frank Glover, Kevin A 2012-12-05 http://www.biomedcentral.com/1756-0500/5/672 en eng BioMed Central Ltd. http://www.biomedcentral.com/1756-0500/5/672 Copyright 2012 Solberg et al.; licensee BioMed Central Ltd. Atlantic salmon Farmed escapees Introgression Hybrid Common garden mRNA level Insulin-like growth factor −1 Oxidative stress Non additive inheritance Research article 2012 ftbiomed 2013-03-10T01:07:18Z Abstract Background 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. Article in Journal/Newspaper Atlantic salmon Salmo salar BioMed Central |
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BioMed Central |
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ftbiomed |
language |
English |
topic |
Atlantic salmon Farmed escapees Introgression Hybrid Common garden mRNA level Insulin-like growth factor −1 Oxidative stress Non additive inheritance |
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Atlantic salmon Farmed escapees Introgression Hybrid Common garden mRNA level Insulin-like growth factor −1 Oxidative stress Non additive inheritance Solberg, Monica F Kvamme, Bjørn Olav Nilsen, Frank Glover, Kevin A Effects 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 origin |
topic_facet |
Atlantic salmon Farmed escapees Introgression Hybrid Common garden mRNA level Insulin-like growth factor −1 Oxidative stress Non additive inheritance |
description |
Abstract Background 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. |
format |
Article in Journal/Newspaper |
author |
Solberg, Monica F Kvamme, Bjørn Olav Nilsen, Frank Glover, Kevin A |
author_facet |
Solberg, Monica F Kvamme, Bjørn Olav Nilsen, Frank Glover, Kevin A |
author_sort |
Solberg, Monica F |
title |
Effects 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 origin |
title_short |
Effects 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 origin |
title_full |
Effects 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 origin |
title_fullStr |
Effects 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 origin |
title_full_unstemmed |
Effects 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 origin |
title_sort |
effects 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 origin |
publisher |
BioMed Central Ltd. |
publishDate |
2012 |
url |
http://www.biomedcentral.com/1756-0500/5/672 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
http://www.biomedcentral.com/1756-0500/5/672 |
op_rights |
Copyright 2012 Solberg et al.; licensee BioMed Central Ltd. |
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