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Journal of Bacteriology, November 2002, p. 6190-6197, Vol. 184, No. 22
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.22.6190-6197.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Inversions over the Terminus Region in Salmonella and Escherichia coli: IS200s as the Sites of Homologous Recombination Inverting the Chromosome of Salmonella enterica Serovar Typhi

Suneetha Alokam,1 Shu-Lin Liu,2 Kamal Said,1 and Kenneth E. Sanderson1*

Departments of Biological Sciences,1 Microbiology and Infectious Diseases, University of Calgary, Calgary, Alberta T2N 1N4, Canada2

Received 25 April 2002/ Accepted 19 August 2002

Genomic rearrangements (duplications and inversions) in enteric bacteria such as Salmonella enterica serovar Typhimurium LT2 and Escherichia coli K12 are frequent (10-3 to 10-5) in culture, but in wild-type strains these genomic rearrangements seldom survive. However, inversions commonly survive in the terminus of replication (TER) region, where bidirectional DNA replication terminates; nucleotide sequences from S. enterica serovar Typhimurium LT2, S. enterica serovar Typhi CT18, E. coli K12, and E. coli O157:H7 revealed genomic inversions spanning the TER region. Assuming that S. enterica serovar Typhimurium LT2 represents the ancestral genome structure, we found an inversion of 556 kb in serovar Typhi CT18 between two of the 25 IS200 elements and an inversion of about 700 kb in E. coli K12 and E. coli O157:H7. In addition, there is another inversion of 500 kb in E. coli O157:H7 compared with E. coli K12. PCR analysis confirmed that all S. enterica serovar Typhi strains tested, but not strains of other Salmonella serovars, have an inversion at the exact site of the IS200 insertions. We conclude that inversions of the TER region survive because they do not significantly change replication balance or because they are part of the compensating mechanisms to regain chromosome balance after it is disrupted by insertions, deletions, or other inversions.

* Corresponding author. Mailing address: Department of Biological Sciences, University of Calgary, 2500 University Dr. N.W., Calgary, Alberta T2N 1N4, Canada. Phone: (403) 220-6792. Fax: (403) 289-9311. E-mail: kesander{at}ucalgary.ca.

Journal of Bacteriology, November 2002, p. 6190-6197, Vol. 184, No. 22
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.22.6190-6197.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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