Molecular ecophysiology of Antarctic notothenioid fishes
The notothenioid fishes of the Southern Ocean surrounding Antarctica are remarkable examples of organismal adaptation to extreme cold. Their evolution since the mid-Miocene in geographical isolation and a chronically cold marine environment has resulted in extreme stenothermality of the extant speci...
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crroyalsociety:10.1098/rstb.2006.1946 2024-09-15T17:42:53+00:00 Molecular ecophysiology of Antarctic notothenioid fishes Christina Cheng, C.-H William Detrich, H 2007 http://dx.doi.org/10.1098/rstb.2006.1946 https://royalsocietypublishing.org/doi/pdf/10.1098/rstb.2006.1946 https://royalsocietypublishing.org/doi/full-xml/10.1098/rstb.2006.1946 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Philosophical Transactions of the Royal Society B: Biological Sciences volume 362, issue 1488, page 2215-2232 ISSN 0962-8436 1471-2970 journal-article 2007 crroyalsociety https://doi.org/10.1098/rstb.2006.1946 2024-08-12T04:27:39Z The notothenioid fishes of the Southern Ocean surrounding Antarctica are remarkable examples of organismal adaptation to extreme cold. Their evolution since the mid-Miocene in geographical isolation and a chronically cold marine environment has resulted in extreme stenothermality of the extant species. Given the unique thermal history of the notothenioids, one may ask what traits have been gained, and conversely, what characters have been lost through change in the information content of their genomes. Two dramatic changes that epitomize such evolutionary transformations are the gain of novel antifreeze proteins, which are obligatory for survival in icy seawater, by most notothenioids and the paradoxical loss of respiratory haemoproteins and red blood cells, normally deemed indispensable for vertebrate life, by the species of a highly derived notothenioid family, the icefishes. Here, we review recent advances in our understanding of these traits and their evolution and suggest future avenues of investigation. The formerly coherent paradigm of notothenioid freeze avoidance, developed from three decades of study of antifreeze glycoprotein (AFGP) based cold adaptation, now faces challenges stemming from the recent discovery of antifreeze-deficient, yet freeze-resistant, early notothenioid life stages and from definitive evidence that the liver is not the physiological source of AFGPs in notothenioid blood. The resolution of these intriguing observations is likely to reveal new physiological traits that are unique to the notothenioids. Similarly, the model of AFGP gene evolution from a notothenioid pancreatic trypsinogen-like gene precursor is being expanded and refined based on genome-level analyses of the linked AFGP loci and their ancestral precursors. Finally, the application of comparative genomics to study evolutionary change in the AFGP genotypes of cool-temperate notothenioids from sub-Antarctic habitats, where these genes are not necessary, will contribute to the mechanistic understanding of the dynamics of ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean The Royal Society Philosophical Transactions of the Royal Society B: Biological Sciences 362 1488 2215 2232 |
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The notothenioid fishes of the Southern Ocean surrounding Antarctica are remarkable examples of organismal adaptation to extreme cold. Their evolution since the mid-Miocene in geographical isolation and a chronically cold marine environment has resulted in extreme stenothermality of the extant species. Given the unique thermal history of the notothenioids, one may ask what traits have been gained, and conversely, what characters have been lost through change in the information content of their genomes. Two dramatic changes that epitomize such evolutionary transformations are the gain of novel antifreeze proteins, which are obligatory for survival in icy seawater, by most notothenioids and the paradoxical loss of respiratory haemoproteins and red blood cells, normally deemed indispensable for vertebrate life, by the species of a highly derived notothenioid family, the icefishes. Here, we review recent advances in our understanding of these traits and their evolution and suggest future avenues of investigation. The formerly coherent paradigm of notothenioid freeze avoidance, developed from three decades of study of antifreeze glycoprotein (AFGP) based cold adaptation, now faces challenges stemming from the recent discovery of antifreeze-deficient, yet freeze-resistant, early notothenioid life stages and from definitive evidence that the liver is not the physiological source of AFGPs in notothenioid blood. The resolution of these intriguing observations is likely to reveal new physiological traits that are unique to the notothenioids. Similarly, the model of AFGP gene evolution from a notothenioid pancreatic trypsinogen-like gene precursor is being expanded and refined based on genome-level analyses of the linked AFGP loci and their ancestral precursors. Finally, the application of comparative genomics to study evolutionary change in the AFGP genotypes of cool-temperate notothenioids from sub-Antarctic habitats, where these genes are not necessary, will contribute to the mechanistic understanding of the dynamics of ... |
format |
Article in Journal/Newspaper |
author |
Christina Cheng, C.-H William Detrich, H |
spellingShingle |
Christina Cheng, C.-H William Detrich, H Molecular ecophysiology of Antarctic notothenioid fishes |
author_facet |
Christina Cheng, C.-H William Detrich, H |
author_sort |
Christina Cheng, C.-H |
title |
Molecular ecophysiology of Antarctic notothenioid fishes |
title_short |
Molecular ecophysiology of Antarctic notothenioid fishes |
title_full |
Molecular ecophysiology of Antarctic notothenioid fishes |
title_fullStr |
Molecular ecophysiology of Antarctic notothenioid fishes |
title_full_unstemmed |
Molecular ecophysiology of Antarctic notothenioid fishes |
title_sort |
molecular ecophysiology of antarctic notothenioid fishes |
publisher |
The Royal Society |
publishDate |
2007 |
url |
http://dx.doi.org/10.1098/rstb.2006.1946 https://royalsocietypublishing.org/doi/pdf/10.1098/rstb.2006.1946 https://royalsocietypublishing.org/doi/full-xml/10.1098/rstb.2006.1946 |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
Philosophical Transactions of the Royal Society B: Biological Sciences volume 362, issue 1488, page 2215-2232 ISSN 0962-8436 1471-2970 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rstb.2006.1946 |
container_title |
Philosophical Transactions of the Royal Society B: Biological Sciences |
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362 |
container_issue |
1488 |
container_start_page |
2215 |
op_container_end_page |
2232 |
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1810489679079800832 |