Transgenerational effects on body size and survival in Brook charr (<i>Salvelinus fontinalis</i>)

Houle, Carolyne; Gossieaux, Philippine; Bernatchez, Louis; Audet, Céline; Garant, Dany

doi:10.1111/eva.13553

Cited by 4 publications

References 49 publications

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Transcriptomic responses to within- and transgenerational environmental warming in a cold-adapted salmonid

Penney

Burness

Wilson

2022

Preprint

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Cold-adapted species are particularly threatened by climate change as rates of environmental warming outpace the ability of many populations adapt. Recent evidence suggest that transgenerational thermal plasticity may play a role in the response of cold-adapted organisms to long-term changes in temperature. Using RNA sequencing, we explored differential gene expression of lake trout (Salvelinus namaycush), a cold-adapted species, to examine the molecular processes that respond to elevated temperatures under conditions of within-generation (offspring) and transgenerational (parental) warm-acclimation. We hypothesized that genes associated with metabolism, growth and thermal stress/tolerance would be differentially expressed in juvenile lake trout offspring depending on their own acclimation temperature and that of their parents. We found enriched pathways for thermal stress, signaling processes, immune function, and transcription regulation, although the specific genes and direction of differential expression (up- or downregulation) depended on the combination of offspring and parental thermal rearing conditions. While parental warm-acclimation did have a transgenerational effect on gene expression in their offspring, within-generation warm-acclimation had a larger effect on differential expression, enriching more pathways. We provide evidence of the transgenerational response to warming at the transcriptional level in lake trout, which should be useful for future studies of transcriptomics and plasticity in these and other cold-adapted species.

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Transcriptomic responses to within- and transgenerational environmental warming in a cold-adapted salmonid

Penney

Burness

Wilson

2022

Preprint

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Metabolic and transcriptomic response of two juvenile anadromous brook charr (Salvelinus fontinalis) genetic lines towards a chronic thermal stress

Jourdain-Bonneau,

Deslauriers,

Gourtay

et al. 2023

Can. J. Zool.

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Many salmonid species are particularly susceptible to chronic and acute temperature changes caused by global warming. We aimed to study the differences in metabolic and transcriptomic responses of a chronic heat stress on a control and selected (absence of early sexual maturation and growth) line of brook charr Salvelinus fontinalis (Mitchill, 1814). We exposed individuals to different temperatures for 35 days (15, 17 and 19 °C). High temperature reduced the growth rate (in length) and the Fulton condition factor. Both maximal metabolic rate and the aerobic scope were higher in fish reared at 17 °C, while they decreased in fish maintained at 19 °C. The relative gene expression of cytochrome c oxidase was lower at 19 °C than at 15 °C. The relative gene expressions of both liver and gill hsp90 was higher at the highest temperature. The standard metabolic rate, while not affected by temperature, was higher for the control line over the selected line. Only in the control line, the relative expression of catalase and of receptor of insulin-like growth factor-1 increased at 19 °C. Our results showed that the selected line was able to cope more effectively with the oxidative stress caused by the rise in temperature.

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Selection effects on early life history traits and thermal resistance in brook charr Salvelinus fontinalis

Gourtay,

Rivolet,

Ghinter

et al. 2024

Can. J. Zool.

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In the context of climate change, it is crucial to understand whether animals that have been domesticated and/or selected maintain their abilities to adapt to changes in their thermal environment. Here, we tested how selection for absence of early sexual maturation combined with better growth performance may have impacted thermal resistance and gene expression response in the presence of thermal stress in brook charr Salvelinus fontinalis (Mitchill, 1814). We performed temperature challenge tests on brook charr 0+ juveniles and studied the expression of genes involved in the response to oxidative stress, in synthesis of heat shock proteins, or involved in regulation of apoptosis, in heart and liver tissues. Juveniles from the selected lineage had a higher thermal resistance than controls and a loss of equilibrium occurred on average 1°C above what was observed for the controls. The relative expressions of catalase and HSP70 were significantly higher in juveniles from the selection program. Overall, thermally sensitive fish were characterized by low mass and length and lower relative expressions of genes associated with stress response. Our results indicate that selection for traits of interests may be indirectly related to the significant lineage effect on growth in early stages of development.

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Transgenerational effects on body size and survival in Brook charr (Salvelinus fontinalis)

Cited by 4 publications

References 49 publications

Transcriptomic responses to within- and transgenerational environmental warming in a cold-adapted salmonid

Transcriptomic responses to within- and transgenerational environmental warming in a cold-adapted salmonid

Metabolic and transcriptomic response of two juvenile anadromous brook charr (Salvelinus fontinalis) genetic lines towards a chronic thermal stress

Selection effects on early life history traits and thermal resistance in brook charr Salvelinus fontinalis

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