Tolerance to Gamma Radiation in the Marine Heterotardigrade, Echiniscoides sigismundi
Tardigrades belong to the most radiation tolerant animals on Earth, as documented by a number of studies using both low-LET and high-LET ionizing radiation. Previous studies have focused on semi-terrestrial species, which are also very tolerant to desiccation. The predominant view on the reason for...
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| creator | Jönsson, K Ingemar Hygum, Thomas L Andersen, Kasper N Clausen, Lykke K B Møbjerg, Nadja |
| description | Tardigrades belong to the most radiation tolerant animals on Earth, as documented by a number of studies using both low-LET and high-LET ionizing radiation. Previous studies have focused on semi-terrestrial species, which are also very tolerant to desiccation. The predominant view on the reason for the high radiation tolerance among these semi-terrestrial species is that it relies on molecular mechanisms that evolved as adaptations for surviving dehydration. In this study we report the first study on radiation tolerance in a marine tardigrade, Echiniscoides sigismundi. Adult specimens in the hydrated active state were exposed to doses of gamma radiation from 100 to 5000 Gy. The results showed little effect of radiation at 100 and 500 Gy but a clear decline in activity at 1000 Gy and higher. The highest dose survived was 4000 Gy, at which ca. 8% of the tardigrades were active 7 days after irradiation. LD50 in the first 7 days after irradiation was in the range of 1100-1600 Gy. Compared to previous studies on radiation tolerance in semi-terrestrial and limnic tardigrades, Echiniscoides sigismundi seems to have a lower tolerance. However, the species still fits into the category of tardigrades that have high tolerance to both desiccation and radiation, supporting the hypothesis that radiation tolerance is a by-product of adaptive mechanisms to survive desiccation. More studies on radiation tolerance in tardigrade species adapted to permanently wet conditions, both marine and freshwater, are needed to obtain a more comprehensive picture of the patterns of radiation tolerance. |
| doi_str_mv | 10.1371/journal.pone.0168884 |
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Previous studies have focused on semi-terrestrial species, which are also very tolerant to desiccation. The predominant view on the reason for the high radiation tolerance among these semi-terrestrial species is that it relies on molecular mechanisms that evolved as adaptations for surviving dehydration. In this study we report the first study on radiation tolerance in a marine tardigrade, Echiniscoides sigismundi. Adult specimens in the hydrated active state were exposed to doses of gamma radiation from 100 to 5000 Gy. The results showed little effect of radiation at 100 and 500 Gy but a clear decline in activity at 1000 Gy and higher. The highest dose survived was 4000 Gy, at which ca. 8% of the tardigrades were active 7 days after irradiation. LD50 in the first 7 days after irradiation was in the range of 1100-1600 Gy. Compared to previous studies on radiation tolerance in semi-terrestrial and limnic tardigrades, Echiniscoides sigismundi seems to have a lower tolerance. However, the species still fits into the category of tardigrades that have high tolerance to both desiccation and radiation, supporting the hypothesis that radiation tolerance is a by-product of adaptive mechanisms to survive desiccation. More studies on radiation tolerance in tardigrade species adapted to permanently wet conditions, both marine and freshwater, are needed to obtain a more comprehensive picture of the patterns of radiation tolerance.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0168884</identifier><identifier>PMID: 27997621</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Adaptation ; Adaptation, Physiological ; Adaptations ; Animals ; Aquatic Organisms - physiology ; Astrobiology ; Biologi ; Biological evolution ; Biological Sciences ; Biologiska vetenskaper ; Biology ; Biology and Life Sciences ; Dehydration ; Desiccation ; Drying ; Earth Sciences ; Echiniscoides sigismundi ; Ecology and Environmental Sciences ; Gamma radiation ; gamma ray ; Gamma Rays ; Health aspects ; Hypotheses ; Ionizing radiation ; Irradiation ; Microorganisms ; Molecular modelling ; Natural Sciences ; Naturvetenskap ; Physical Sciences ; Radiation ; Radiation exposure ; Radiation tolerance ; Radiation Tolerance - physiology ; Seawater ; Studies ; Tardigrada ; Tardigrada - physiology ; Tardigrades ; Temperature ; Terrestrial environments ; Tidal water bear ; Zoologi ; Zoology ; γ Radiation</subject><ispartof>PloS one, 2016-12, Vol.11 (12), p.e0168884-e0168884</ispartof><rights>COPYRIGHT 2016 Public Library of Science</rights><rights>2016 Jönsson et al. 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Previous studies have focused on semi-terrestrial species, which are also very tolerant to desiccation. The predominant view on the reason for the high radiation tolerance among these semi-terrestrial species is that it relies on molecular mechanisms that evolved as adaptations for surviving dehydration. In this study we report the first study on radiation tolerance in a marine tardigrade, Echiniscoides sigismundi. Adult specimens in the hydrated active state were exposed to doses of gamma radiation from 100 to 5000 Gy. The results showed little effect of radiation at 100 and 500 Gy but a clear decline in activity at 1000 Gy and higher. The highest dose survived was 4000 Gy, at which ca. 8% of the tardigrades were active 7 days after irradiation. LD50 in the first 7 days after irradiation was in the range of 1100-1600 Gy. Compared to previous studies on radiation tolerance in semi-terrestrial and limnic tardigrades, Echiniscoides sigismundi seems to have a lower tolerance. However, the species still fits into the category of tardigrades that have high tolerance to both desiccation and radiation, supporting the hypothesis that radiation tolerance is a by-product of adaptive mechanisms to survive desiccation. More studies on radiation tolerance in tardigrade species adapted to permanently wet conditions, both marine and freshwater, are needed to obtain a more comprehensive picture of the patterns of radiation tolerance.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>27997621</pmid><doi>10.1371/journal.pone.0168884</doi><tpages>e0168884</tpages><orcidid>https://orcid.org/0000-0002-1732-0372</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | PloS one, 2016-12, Vol.11 (12), p.e0168884-e0168884 |
| issn | 1932-6203 1932-6203 |
| language | eng |
| recordid | cdi_plos_journals_1850750929 |
| source | MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; SWEPUB Freely available online; Public Library of Science (PLoS); PubMed Central; Free Full-Text Journals in Chemistry |
| subjects | Adaptation Adaptation, Physiological Adaptations Animals Aquatic Organisms - physiology Astrobiology Biologi Biological evolution Biological Sciences Biologiska vetenskaper Biology Biology and Life Sciences Dehydration Desiccation Drying Earth Sciences Echiniscoides sigismundi Ecology and Environmental Sciences Gamma radiation gamma ray Gamma Rays Health aspects Hypotheses Ionizing radiation Irradiation Microorganisms Molecular modelling Natural Sciences Naturvetenskap Physical Sciences Radiation Radiation exposure Radiation tolerance Radiation Tolerance - physiology Seawater Studies Tardigrada Tardigrada - physiology Tardigrades Temperature Terrestrial environments Tidal water bear Zoologi Zoology γ Radiation |
| title | Tolerance to Gamma Radiation in the Marine Heterotardigrade, Echiniscoides sigismundi |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-15T12%3A02%3A47IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_plos_&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Tolerance%20to%20Gamma%20Radiation%20in%20the%20Marine%20Heterotardigrade,%20Echiniscoides%20sigismundi&rft.jtitle=PloS%20one&rft.au=J%C3%B6nsson,%20K%20Ingemar&rft.date=2016-12-20&rft.volume=11&rft.issue=12&rft.spage=e0168884&rft.epage=e0168884&rft.pages=e0168884-e0168884&rft.issn=1932-6203&rft.eissn=1932-6203&rft_id=info:doi/10.1371/journal.pone.0168884&rft_dat=%3Cgale_plos_%3EA474641697%3C/gale_plos_%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1850750929&rft_id=info:pmid/27997621&rft_galeid=A474641697&rft_doaj_id=oai_doaj_org_article_44aaf5e457d649c38f1859ae1f2e7075&rfr_iscdi=true |