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Journal of Bacteriology, December 1999, p. 7614-7617, Vol. 181, No. 24
0021-9193/99/$04.00+0

Promiscuous Origin of a Chimeric Sequence in the Escherichia coli O157:H7 Genome

J. Eugene LeClerc, Baoguang Li, William L. Payne, and Thomas A. Cebula*

Molecular Biology Branch, Center for Food Safety and Applied Nutrition, Food and Drug Administration, Washington, D.C. 20204

Received 16 July 1999/Accepted 30 September 1999

A novel sequence of 2.9 kb in the intergenic region between the mutS and rpoS genes of Escherichia coli O157:H7 and closely related strains replaces a sequence of 6.1 kb in E. coli K-12 strains. At the same locus in Shigella dysenteriae type 1, a sequence identical to that in O157:H7 is bounded by the IS1 insertion sequence element. Extensive polymorphism in the mutS-rpoS chromosomal region is indicative of horizontal transfer events.

* Corresponding author. Mailing address: Molecular Biology Branch, Center for Food Safety and Applied Nutrition, Food and Drug Administration, HFS-235, 200 C St., S.W., Washington, DC 20204. Phone: (202) 205-4217. Fax: (202) 401-1105. E-mail: tac{at}cfsan.fda.gov.

Journal of Bacteriology, December 1999, p. 7614-7617, Vol. 181, No. 24
0021-9193/99/$04.00+0


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