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J. Bacteriol., Jun 1996, 3207-3211, Vol 178, No. 11
Copyright © 1996, American Society for Microbiology

Exchange of genetic markers at extremely high temperatures in the archaeon Sulfolobus acidocaldarius

DW Grogan
Department of Biological Sciences, University of Cincinnati, OH 45221- 0006, USA.

When cells of two auxotrophic mutants of Sulfolobus acidocaldarius are mixed and incubated on solid medium, they form stable genetic recombinants which can be selected, enumerated, and characterized. Any of a variety of auxotrophic markers can recombine with each other, and the phenomenon has been observed at temperatures of up to 84 degrees C. The ability to exchange and recombine chromosomal markers appears to be an intrinsic property of S. acidocaldarius strains. It occurs between two cell lines derived from the same parent or from different parents and also between a recombinant and its parent. This is the first observation of chromosomal marker exchange in archaea from geothermal environments and provides the first functional evidence of generalized, homologous recombination at such high temperatures.

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