Evolution in chronic cold: varied loss of cellular response to heat in Antarctic notothenioid fish

• Main Authors: Bilyk, Kevin, Vargas-Chacoff, Luis, C.-H.Christina Cheng
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Figshare 2018
• Subjects: Cell Biology; Genetics; FOS Biological sciences; Molecular Biology; Physiology; Biotechnology; Evolutionary Biology; 59999 Environmental Sciences not elsewhere classified; FOS Earth and related environmental sciences; Ecology; Marine Biology; Inorganic Chemistry; FOS Chemical sciences; 111714 Mental Health; FOS Health sciences; 110309 Infectious Diseases; Plant Biology; Computational Biology; Antarctic; Southern Ocean; The Antarctic; Antarc*; Icefish
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.4238360; https://figshare.com/collections/Evolution_in_chronic_cold_varied_loss_of_cellular_response_to_heat_in_Antarctic_notothenioid_fish/4238360

Abstract Background Confined within the freezing Southern Ocean, the Antarctic notothenioids have evolved to become both cold adapted and cold specialized. A marked signature of cold specialization is an apparent loss of the cellular heat shock response (HSR). As the HSR has been examined in very few notothenioid species to-date, it remains unknown whether HSR loss pervades the Antarctic radiation, or whether the broader cellular responses to heat stress has sustained similar loss. Understanding the evolutionary status of these responses in this stenothermal taxon is crucial for evaluating its adaptive potential to ocean warming under climate change. Results In this study, we used an acute heat stress protocol followed by RNA-Seq analyses to study the evolution of cellular-wide transcriptional responses to heat stress across three select notothenioid lineages - the basal temperate and nearest non-Antarctic sister species Eleginops maclovinus serving as ancestral proxy, the cryopelagic Pagothenia borchgrevinki and the icefish Chionodraco rastrospinosus representing cold-adapted red-blooded and hemoglobinless Antarctic notothenioids respectively. E. maclovinus displayed robust cellular stress responses including the ER Unfolded Protein Response and the cytosolic HSR, cementing the HSR as a plesiomorphy that preceded Antarctic notothenioid radiation. While the transcriptional response to heat stress was minimal in P. borchgrevinki, C. rastrospinosus exhibited robust responses in the broader cellular networks especially in inflammatory responses despite lacking the classic HSR and UPR. Conclusion The disparate patterns observed in these two archetypal Antarctic species indicate the evolutionary status in cellular ability to mitigate acute heat stress varies even among Antarctic lineages, which may affect their adaptive potential in coping with a warming world.