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

BMC Evolutionary Biology
Kevin T BilykC-H Christina Cheng

Abstract

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. 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 cyto...Continue Reading

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Citations

Feb 16, 2019·The Journal of Experimental Biology·Kevin T BilykC-H Christina Cheng
Nov 7, 2019·BMC Evolutionary Biology·Samuel N Bogan, Sean P Place
Jun 12, 2019·Nature Ecology & Evolution·Jacob M DaaneMatthew P Harris
Dec 1, 2020·Marine Genomics·Daniela GiordanoCinzia Verde
Jan 17, 2021·Journal of Fish Biology·Luis Vargas-ChacoffJorge M Navarro
Dec 24, 2020·Biological Reviews of the Cambridge Philosophical Society·Julian GuttDiana H Wall
May 28, 2021·The Journal of Experimental Biology·Kristin M O'BrienAnthony P Farrell
Sep 24, 2020·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·K M O'BrienE L Crockett

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Datasets Mentioned

BETA
SRP098134

Methods Mentioned

BETA
environmental stresses
RNA-Seq
PCA
protein folding
environmental stress
RNAseq
MDS

Software Mentioned

Bioconductor package
Trimmomatic
RSEM
Bowtie2
Trinotate
REVIGO
Trinity
edgeR
Multiparanoid
R

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