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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,
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.

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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