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Mineralization and Preservation of an extremotolerant Bacterium Isolated from an Early Mars Analog Environment

Research output: Contribution to journalArticle

  • F. Gaboyer
  • C. Le Milbeau
  • M. Bohmeier
  • P. Vannier
  • K. Beblo-Vranesevic
  • E. Rabbow
  • F. Foucher
  • P. Gautret
  • R. Guegan
  • A. Richard
  • A. Sauldubois
  • P. Richmann
  • A. K. Perras
  • C. Moissl-Eichinger
  • P. Rettberg
  • Viggó Marteinsson
  • E. Monaghan
  • P. Ehrenfreund
  • L. Garcia-Descalzo
  • F. Gomez
  • M. Malki
  • R. Amils
  • P. Cabezas
  • N. Walter
  • F. Westall

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Original languageEnglish
Article number8775
Number of pages14
JournalScientific Reports
Volume7
DOIs
StatePublished - 18 Aug 2017

Abstract

The artificial mineralization of a polyresistant bacterial strain isolated from an acidic, oligotrophic lake was carried out to better understand microbial (i) early mineralization and (ii) potential for further fossilisation. Mineralization was conducted in mineral matrixes commonly found on Mars and Early-Earth, silica and gypsum, for 6 months. Samples were analyzed using microbiological (survival rates), morphological (electron microscopy), biochemical (GC-MS, Microarray immunoassay, Rock-Eval) and spectroscopic (EDX, FTIR, RAMAN spectroscopy) methods. We also investigated the impact of physiological status on mineralization and long-term fossilisation by exposing cells or not to Mars-related stresses (desiccation and radiation). Bacterial populations remained viable after 6 months although the kinetics of mineralization and cell-mineral interactions depended on the nature of minerals. Detection of biosignatures strongly depended on analytical methods, successful with FTIR and EDX but not with RAMAN and immunoassays. Neither influence of stress exposure, nor qualitative and quantitative changes of detected molecules were observed as a function of mineralization time and matrix. Rock-Eval analysis suggests that potential for preservation on geological times may be possible only with moderate diagenetic and metamorphic conditions. The implications of our results for microfossil preservation in the geological record of Earth as well as on Mars are discussed.

    Research areas

  • BLUE-GREEN-ALGAE, EXPERIMENTAL SILICIFICATION, EXPERIMENTAL FOSSILIZATION, EXPERIMENTAL DIAGENESIS, MOLECULAR PRESERVATION, EXTREMOPHILIC ARCHAEA, RAMAN-SPECTROSCOPY, MERIDIANI-PLANUM, ARCHEAN CHERTS, ATACAMA DESERT

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