Back to the roots, desiccation and radiation resistances are ancestral characters in bdelloid rotifers

Boris Hespeels, Diego Fontaneto, Valérie Cornet, Sébastien Penninckx, Jérémy Berthe, Lucie Bruneau, James W Larrick, Eloïse Rapport, Jérémie Bailly, Nicolas Debortoli, Nataliia Iakovenko, Karel Janko, Anne-Catherine Heuskin, Stéphane Lucas, Bernard Hallet, Karine Van Doninck

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

BACKGROUND: Bdelloid rotifers are micro-invertebrates distributed worldwide, from temperate latitudes to the most extreme areas of the planet like Antarctica or the Atacama Desert. They have colonized any habitat where liquid water is temporarily available, including terrestrial environments such as soils, mosses, and lichens, tolerating desiccation and other types of stress such as high doses of ionizing radiation (IR). It was hypothesized that bdelloid desiccation and radiation resistance may be attributed to their potential ability to repair DNA double-strand breaks (DSBs). Here, these properties are investigated and compared among nine bdelloid species collected from both mild and harsh habitats, addressing the correlation between the ability of bdelloid rotifers to survive desiccation and their capacity to repair massive DNA breakage in a phylogenetically explicit context. Our research includes both specimens isolated from habitats that experience frequent desiccation (at least 1 time per generation), and individuals sampled from habitats that rarely or never experienced desiccation.

RESULTS: Our analysis reveals that DNA repair prevails in somatic cells of both desiccation-tolerant and desiccation-sensitive bdelloid species after exposure to X-ray radiation. Species belonging to both categories are able to withstand high doses of ionizing radiation, up to 1000 Gy, without experiencing any negative effects on their survival. However, the fertility of two desiccation-sensitive species, Rotaria macrura and Rotaria rotatoria, was more severely impacted by low doses of radiation than that of desiccation-resistant species. Surprisingly, the radioresistance of desiccation-resistant species is not related to features of their original habitat. Indeed, bdelloids isolated from Atacama Desert or Antarctica were not characterized by a higher radioresistance than species found in more temperate environments.

CONCLUSIONS: Tolerance to desiccation and radiation are supported as ancestral features of bdelloid rotifers, with a group of species of the genus Rotaria having lost this trait after colonizing permanent water habitats. Together, our results provide a comprehensive overview of the evolution of desiccation and radiation resistance among bdelloid rotifers.

langue originaleAnglais
Numéro d'article72
Pages (de - à)72
Nombre de pages1
journalBMC biology
Volume21
Numéro de publication1
Les DOIs
Etat de la publicationPublié - déc. 2023

Financement

The authors thank V. Baumlé, C. Bopp, M. Terwagne, and E. Nicolas for useful discussions and comments. C. Demazy is highly thanked for her help in Antarctic species maintenance. The authors are also grateful to C. Wilson, A. Houtain, and D.M Welch who provided respectively clones of A. ricciae , R. macrura, and P. roseola. We thank C. Ricci for her help concerning geographical origin of species used in this research. We thank Drs. Nathalie A. Cabrol, Director of the Carl Sagan Center, SETI Institute, Mountain View, CA, USA, and Dr. Colin Flinders, University of Southern California for support, Ms. Hong Wang for help with Atacama species cloning and maintenance and LaRuke Development for financial support. The authors thank the European Space Agency (ESA) and the Belgian Federal Science Policy Office (BELSPO) for their support in the framework of the PRODEX Program. Project was supported by the European Space Agency (ESA) and the Belgian Federal Science Policy Office (BELSPO) in the framework of the PRODEX Program. KVD was supported by the European Research Council (ERC) with the grant agreement 725998 (RHEA). S. Penninckx is funded by the Walloon Region (PROTHERWAL, grant n°7289). K. Janko, D. Fontaneto and N.Iakovenko received support from Czech Science Foundation grant No. 22-28778S.

Bailleurs de fondsNuméro du bailleur de fonds
European Space Agency
SETI Institute
Waalse Gewest
Carl Sagan Center
Belgian Science Policy Office
LaRuke Development
European Research Council
RHEA
Horizon 2020 Framework Programme725998
Grantová Agentura České Republiky22-28778S
PROTHERWAL7289

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