{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,6]],"date-time":"2026-09-06T18:24:56Z","timestamp":1788719096136,"version":"build-2803163510"},"reference-count":90,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2021,2,11]],"date-time":"2021-02-11T00:00:00Z","timestamp":1613001600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Italian Program of Antarctic Research","award":["PNRA16_00099"],"award-info":[{"award-number":["PNRA16_00099"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Far from being devoid of life, Antarctic waters are home to Cryonotothenioidea, which represent one of the fascinating cases of evolutionary adaptation to extreme environmental conditions in vertebrates. Thanks to a series of unique morphological and physiological peculiarities, which include the paradigmatic case of loss of hemoglobin in the family Channichthyidae, these fish survive and thrive at sub-zero temperatures. While some of the distinctive features of such adaptations have been known for decades, our knowledge of their genetic and molecular bases is still limited. We generated a reference de novo assembly of the icefish Chionodraco hamatus transcriptome and used this resource for a large-scale comparative analysis among five red-blooded Cryonotothenioidea, the sub-Antarctic notothenioid Eleginops maclovinus and seven temperate teleost species. Our investigation targeted the gills, a tissue of primary importance for gaseous exchange, osmoregulation, ammonia excretion, and its role in fish immunity. One hundred and twenty genes were identified as significantly up-regulated in Antarctic species and surprisingly shared by red- and white-blooded notothenioids, unveiling several previously unreported molecular players that might have contributed to the evolutionary success of Cryonotothenioidea in Antarctica. In particular, we detected cobalamin deficiency signatures and discussed the possible biological implications of this condition concerning hematological alterations and the heavy parasitic loads typically observed in all Cryonotothenioidea.<\/jats:p>","DOI":"10.3390\/ijms22041812","type":"journal-article","created":{"date-parts":[[2021,2,12]],"date-time":"2021-02-12T18:45:00Z","timestamp":1613155500000},"page":"1812","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Cold Adaptation in Antarctic Notothenioids: Comparative Transcriptomics Reveals Novel Insights in the Peculiar Role of Gills and Highlights Signatures of Cobalamin Deficiency"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6344-4931","authenticated-orcid":false,"given":"Federico","family":"Ansaloni","sequence":"first","affiliation":[{"name":"Department of Life Sciences, University of Trieste, 34127 Trieste, Italy"},{"name":"International School for Advanced Studies, 34136 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6411-0813","authenticated-orcid":false,"given":"Marco","family":"Gerdol","sequence":"additional","affiliation":[{"name":"Department of Life Sciences, University of Trieste, 34127 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"Torboli","sequence":"additional","affiliation":[{"name":"Department of Life Sciences, University of Trieste, 34127 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicola Reinaldo","family":"Fornaini","sequence":"additional","affiliation":[{"name":"Department of Life Sciences, University of Trieste, 34127 Trieste, Italy"},{"name":"Department of Cell Biology, Charles University, 12800 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3435-2656","authenticated-orcid":false,"given":"Samuele","family":"Greco","sequence":"additional","affiliation":[{"name":"Department of Life Sciences, University of Trieste, 34127 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5356-7754","authenticated-orcid":false,"given":"Piero Giulio","family":"Giulianini","sequence":"additional","affiliation":[{"name":"Department of Life Sciences, University of Trieste, 34127 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria Rosaria","family":"Coscia","sequence":"additional","affiliation":[{"name":"Institute of Biochemistry and Cell Biology, National Research Council of Italy, 80131 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4545-7229","authenticated-orcid":false,"given":"Andrea","family":"Miccoli","sequence":"additional","affiliation":[{"name":"Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8260-7006","authenticated-orcid":false,"given":"Gianfranco","family":"Santovito","sequence":"additional","affiliation":[{"name":"Department of Biology, University of Padua, 35131 Padua, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8045-5651","authenticated-orcid":false,"given":"Francesco","family":"Buonocore","sequence":"additional","affiliation":[{"name":"Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9730-9394","authenticated-orcid":false,"given":"Giuseppe","family":"Scapigliati","sequence":"additional","affiliation":[{"name":"Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, 01100 Viterbo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto","family":"Pallavicini","sequence":"additional","affiliation":[{"name":"Department of Life Sciences, University of Trieste, 34127 Trieste, Italy"},{"name":"Anton Dohrn Zoological Station, 80122 Naples, Italy"},{"name":"National Institute of Oceanography and Experimental Geophysics, 34010 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,2,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"607","DOI":"10.1007\/s00300-014-1623-6","article-title":"Low Level of Genetic 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