Adaptation of Bacillus subtilis cells to Archean-like UV climate: relevant hints of microbial evolution to remarkably increased radiation resistance.
Wassmann, Marko and Moeller, Ralf and Reitz, Guenther and Rettberg, Petra (2010) Adaptation of Bacillus subtilis cells to Archean-like UV climate: relevant hints of microbial evolution to remarkably increased radiation resistance. Astrobiology, 10 (6), pp. 605-615. Mary Ann Liebert, Inc.. DOI: 10.1089/ast.2009.0455.
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In a precursory study for the space experiment ADAPT (‘‘Molecular adaptation strategies of microorganisms to different space and planetary UV climate conditions’’), cells of Bacillus subtilis 168 were continuously cultured for 700 generations under periodic polychromatic UV irradiation (200–400 nm) to model the suggested UV radiation environment on early Earth at the origin of the first microbial ecosystem during the Archean eon when Earth lacked a significant ozone layer. Populations that evolved under UV stress were about 3-fold more resistant than the ancestral and non-UV-evolved populations. UV-evolved cells were 7-fold more resistant to ionizing radiation than their non-UV-exposed evolved relatives and ancestor. In addition to the acquired increased UV resistance, further changes in microbial stress response to hydrogen peroxide, increased salinity, and desiccation were observed in UV-evolved cells. This indicates that UV-sensitive ancestral cells are capable of adapting to periodically applied UV stress via the evolution of cells with an increased UV resistance level and further enhanced responses to other environmental stressors, which thereby allows them to survive and reproduce under extreme UV radiation as a selection pressure.
|Title:||Adaptation of Bacillus subtilis cells to Archean-like UV climate: relevant hints of microbial evolution to remarkably increased radiation resistance.|
|Journal or Publication Title:||Astrobiology|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 605-615|
|Publisher:||Mary Ann Liebert, Inc.|
|Keywords:||UV radiation, Ionizing radiation, Experimental evolution, Bacillus subtilis|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Strahlenbiologie (old)|
|Institutes and Institutions:||Institute of Aerospace Medicine > Radiation Biology|
|Deposited By:||Kerstin Kopp|
|Deposited On:||16 Sep 2010 14:49|
|Last Modified:||26 Mar 2013 13:19|
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