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Thermal acclimation in Antarctic fish: transcriptomic profiling of metabolic pathways.
Heidrun Sigrid Windisch1, Raphaela Kathöver, Hans-Otto Pörtner
1Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany. heidrun.windisch@awi.de
Summary
Antarctic fish show remarkable warm acclimation by shifting metabolism from lipids to carbohydrates. This metabolic reorganization, involving specific gene expression, enhances their resilience to warming temperatures beyond their typical cold environment.
Area of Science:
- * Physiology and molecular biology of Antarctic fish adaptation.
- * Investigating thermal sensitivity and metabolic plasticity in cold-water species.
Background:
- * Antarctic fish are presumed to have evolved cold adaptation at the cost of thermal sensitivity.
- * Recent evidence suggests Antarctic fish possess significant warm acclimation capabilities.
Purpose of the Study:
- * To investigate hepatic metabolic reorganization in Antarctic eelpout (Pachycara brachycephalum) during warm acclimation.
- * To identify the molecular mechanisms underlying metabolic shifts in response to warming.
Main Methods:
- * Warm acclimation of Antarctic eelpout to 5°C over 6 weeks.
- * Measurement of key metabolic enzyme activities (cytochrome c oxidase, citrate synthase, hydroxyacyl-CoA dehydrogenase, phosphoenolpyruvate carboxykinase).
- * Transcriptome analysis using multivariate statistical methods (canonical correspondence analyses).
Main Results:
- * Increased cytochrome c oxidase (90%) and phosphoenolpyruvate carboxykinase (40%) activities.
- * Decreased citrate synthase (20%) activity, indicating a shift from lipid to carbohydrate metabolism.
- * Significant transcriptome rearrangements and a novel dichotomy in peroxisome proliferator-activated receptor expression.
Conclusions:
- * Antarctic eelpout exhibit a distinct metabolic reorganization favoring carbohydrate utilization during warm acclimation.
- * This shift supports warm hardiness by potentially enhancing anaerobic metabolism and preparing for hypoxemic conditions.
- * A specific molecular network is identified that responds to warming beyond the fish's ecological niche.
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