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Tardigrades as a potential model organism in space research
Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Research environment Man & Biosphere Health (MABH).ORCID iD: 0000-0002-1732-0372
2007 (English)In: Astrobiology, ISSN 1531-1074, E-ISSN 1557-8070, Vol. 7, no 5, 757-766 p.Article in journal (Refereed) Published
Abstract [en]

Exposure of living organisms to open space requires a high level of tolerance to desiccation, cold, and radiation. Among animals, only anhydrobiotic species can fulfill these requirements. The invertebrate phylum Tardigrada includes many anhydrobiotic species, which are adapted to survive in very dry or cold environmental conditions. As a likely by-product of the adaptations for desiccation and freezing, tardigrades also show a very high tolerance to a number of other, unnatural conditions, including exposure to ionizing radiation. This makes tardigrades an interesting candidate for experimental exposure to open space. This paper reviews the tolerances that make tardigrades suitable for astrobiological studies and the reported radiation tolerance in other anhydrobiotic animals. Several studies have shown that tardigrades can survive gamma-irradiation well above 1 kilogray, and desiccated and hydrated (active) tardigrades respond similarly to irradiation. Thus, tolerance is not restricted to the dry anhydrobiotic state, and I discuss the possible involvement of an efficient, but yet undocumented, mechanism for DNA repair. Other anhydrobiotic animals (Artemia, Polypedium), when dessicated, show a higher tolerance to gamma-irradiation than hydrated animals, possibly due to the presence of high levels of the protective disaccharide trehalose in the dry state. Tardigrades and other anhydrobiotic animals provide a unique opportunity to study the effects of space exposure on metabolically inactive but vital metazoans.

Place, publisher, year, edition, pages
2007. Vol. 7, no 5, 757-766 p.
Keyword [en]
EUTARDIGRADE RICHTERSIUS-CORONIFER, TERM ANHYDROBIOTIC SURVIVAL, IONIZING-RADIATION, POLYPEDILUM-VANDERPLANKI, DEINOCOCCUS-RADIODURANS, MILNESIUM-TARDIGRADUM, DESICCATION TOLERANCE, ADORYBIOTUS-CORONIFER, CRYPTOBIOSIS, TREHALOSE
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hkr:diva-190DOI: 10.1089/ast.2006.0088ISI: 000250964000007ISBN: 1531-1074 (print)OAI: oai:DiVA.org:hkr-190DiVA: diva2:173573
Available from: 2009-02-16 Created: 2009-02-11 Last updated: 2017-03-09Bibliographically approved

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