Gene expression
Atlantic cod heat-shock gene responses
Open access · cc by · source: Europe PMC
Heat shock elevates cortisol and rewires chaperone and stress-gene expression in Atlantic cod tissues.
Study at a glance
- Design
- Animal / in-vitro — Heat-shocked Atlantic cod; SSH libraries from liver/head kidney/muscle with QPCR validation
- N
- SSH pools used 32 fish per tissue/treatment group; QPCR used 6 individuals per treatment/time — no single primary N
- Population
- Atlantic cod (Gadus morhua)
- Outcome
- Heat-shock–responsive transcripts and plasma cortisol response
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
Cortisol rose sharply after heat shock (e.g., ~132–165 ng/ml peaks) while controls stayed basal; many chaperone/stress transcripts were confirmed heat-responsive.
Methodology
Heat-shocked Atlantic cod, measured plasma cortisol, built SSH libraries from liver/head kidney/muscle, and validated candidates by QPCR.
Limitations
Cage aquaculture context may differ from wild thermal regimes; not every SSH clone was functionally proven.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
In heat-shocked Atlantic cod, QPCR was the validation layer on SSH libraries from liver, head kidney and muscle. Plasma cortisol rose sharply (peaks around 132–165 ng/ml) while controls stayed basal, and many chaperone and stress transcripts were confirmed heat-responsive. Cage aquaculture thermal regimes may still differ from the wild, and not every SSH clone was functionally proven.
Evidence for the claim as stated.
qPCR is not one experiment. Cod heat-shock QPCR and aphid miRNA RT-PCR quantify candidate transcripts after a screen; chicken defensin RT-PCR confirms that predicted genes are expressed; bee work quantifies 16S community size. Treating those as interchangeable 'expression papers' hides whether the template is host mRNA, a miRNA, or bacterial DNA.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
qPCR is not one experiment. Cod heat-shock QPCR and aphid miRNA RT-PCR quantify candidate transcripts after a screen; chicken defensin RT-PCR confirms that predicted genes are expressed; bee work quantifies 16S community size. Treating those as interchangeable 'expression papers' hides whether the template is host mRNA, a miRNA, or bacterial DNA.
- Supports · Pea aphid miRNAs and plasticity
- Supports · Chicken β-defensin gene cluster
- Supports · Antibiotics hurt bee gut and survival
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