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Survival of halophilic Archaea in Earth's cold stratosphere

  • P. DasSarma (a1), V.J. Laye (a1), J. Harvey (a2), C. Reid (a2), J. Shultz (a2), A. Yarborough (a2), A. Lamb (a2), A. Koske-Phillips (a2), A. Herbst (a2), F. Molina (a2), O. Grah (a2), T. Phillips (a2) and S. DasSarma (a1)...
Abstract

Halophilic Archaea are known to tolerate multiple extreme conditions on Earth and have been proposed as models for astrobiology. In order to assess the importance of cold-adaptation of these microorganisms in surviving stratospheric conditions, we launched live, liquid cultures of two species, the mesophilic model Halobacterium sp. NRC-1 and the cold-adapted Antarctic isolate Halorubrum lacusprofundi ATCC 49239, on helium balloons. After return to Earth, the cold-adapted species showed nearly complete survival while the mesophilic species exhibited slightly reduced viability. Parallel studies found that the cold-adapted species was also better able to survive freezing and thawing in the laboratory. Genome-wide transcriptomic analysis was used to compare the two haloarchaea at optimum growth temperatures versus low temperatures supporting growth. The cold-adapted species displayed perturbation of a majority of genes upon cold temperature exposure, divided evenly between up-regulated and down-regulated genes, while the mesophile exhibited perturbation of only a fifth of its genes, with nearly two-thirds being down-regulated. These results underscore the importance of genetic responses of H. lacusprofundi to cold temperature for enhanced survival in the stratosphere.

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Copyright
Corresponding author
e-mail: pdassarma@som.umaryland.edu
References
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