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Journal of Bacteriology, May 2000, p. 2476-2480, Vol. 182, No. 9
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Distribution of Twelve Linear Extrachromosomal DNAs in
Natural Isolates of Lyme Disease Spirochetes
Nanette
Palmer,1,
Claire
Fraser,2 and
Sherwood
Casjens1,*
Department of Oncological Sciences,
University of Utah Medical School, Salt Lake City, Utah
84132,1 and The Institute for
Genome Science, Rockville, Maryland 208502
Received 28 October 1999/Accepted 4 February 2000
We have analyzed a panel of independent North American
isolates of the Lyme disease agent spirochete, Borrelia
burgdorferi (sensu stricto), for the presence of linear plasmids
with sequence similarities to the 12 linear plasmids present in the
B. burgdorferi type strain, isolate B31. The frequency of
similarities to probes from each of the 12 B31 plasmids varied
from 13 to 100% in the strain panel examined, and these similarities
usually reside on plasmids similar in size to the cognate B31
plasmid. Sequences similar to 5 of the 12 B31 plasmids were found in
all of the isolates examined, and >66% of the panel members
hybridized to probes from 4 other plasmids. Sequences similar to most
of the B. burgdorferi B31 plasmid-derived DNA probes used
were also found on linear plasmids in the related Eurasian Lyme agents
Borrelia garinii and Borrelia afzelii; however,
some of these plasmids had uniform but substantially different sizes
from their B. burgdorferi counterparts.
*
Corresponding author. Mailing address: Department of
Oncological Sciences, University of Utah Medical School, Salt Lake
City, UT 84132. Phone: (801) 581-5980. Fax: (801) 581-3607. E-mail: sherwood.casjens{at}hci.utah.edu.

Present address: Slotervaart Ziekenhuis, Afdeling Bacteriologie,
1066 EC Amsterdam, The
Netherlands.
Journal of Bacteriology, May 2000, p. 2476-2480, Vol. 182, No. 9
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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