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Journal of Bacteriology, July 2000, p. 3867-3869, Vol. 182, No. 13
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Decoupling of Genome Size and Sequence Divergence in a Symbiotic Bacterium

Jennifer J. Wernegreen,* Howard Ochman, Isaac B. Jones, and Nancy A. Moran

Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721

Received 10 December 1999/Accepted 7 April 2000

In contrast to genome size variation in most bacterial taxa, the small genome size of Buchnera sp. was shown to be highly conserved across genetically diverse isolates (630 to 643 kb). This exceptional size conservation may reflect the inability of this obligate mutualist to acquire foreign DNA and reduced selection for genetic novelty within a static intracellular environment.

* Corresponding author. Mailing address: Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, The Marine Biological Laboratory, 7 MBL St., Woods Hole, MA 02543. Phone: (508) 548-3705, ext. 6650. Fax: (508) 457-4727. E-mail: jwernegreen{at}mbl.edu.

Journal of Bacteriology, July 2000, p. 3867-3869, Vol. 182, No. 13
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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