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Applied and Environmental Microbiology, April 2000, p. 1617-1621, Vol. 66, No. 4
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Expanding the Known Diversity and Environmental Distribution of an Uncultured Phylogenetic Division of Bacteria

Michael A. Dojka,dagger J. Kirk Harris, and Norman R. Pace*

Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309-0347

Received 29 November 1999/Accepted 23 January 2000

Culture-independent molecular phylogenetic methods were used to explore the breadth of diversity and environmental distribution of members of the division-level "candidate" phylogenetic group WS6, recently discovered in a contaminated aquifer and with no cultivated representatives. A broad diversity of WS6-affiliated sequences were cloned from 7 of 12 environments investigated: mainly from anaerobic sediment environments. The number of sequences representing the WS6 candidate division was increased from 3 to 60 in this study. The extent of phylogenetic divergence (sequence difference) in this candidate division was found to be among the largest of any known bacterial division. This indicates that organisms representing the WS6 phylogenetic division offer a broad diversity of undiscovered biochemical and metabolic novelty. These results provide a framework for the further study of these evidently important kinds of organisms and tools, the sequences, with which to do so.


* Corresponding author. Mailing address: Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309-0347. Phone: (303) 735-1864. Fax: (303) 492-7744. E-mail: nrpace{at}colorado.edu.

dagger Present address: Maxygen, Inc., Redwood City, CA 94063.


Applied and Environmental Microbiology, April 2000, p. 1617-1621, Vol. 66, No. 4
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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