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Journal of Clinical Microbiology, August 2000, p. 2923-2928, Vol. 38, No. 8
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Mapping of IS6110 Insertion Sites in Two Epidemic Strains of Mycobacterium tuberculosis

Marjorie L. Beggs,1,* Kathleen D. Eisenach,1,2 and M. Donald Cave3

Departments of Pathology,1 Anatomy,3 and Microbiology and Immunology,2 University of Arkansas for Medical Sciences and J. L. McClellan Memorial Veterans Hospital, Little Rock, Arkansas

Received 3 February 2000/Returned for modification 22 March 2000/Accepted 26 May 2000

A widely distributed strain designated 210 was identified in a study of the diversity of Mycobacterium tuberculosis DNA fingerprints from three geographically separate states in the United States. This strain is characterized by a 21-band fingerprint pattern when probed with IS6110, and the pattern is similar to that displayed by strains designated W. Intracellular growth of strain 210 isolates in human macrophages is significantly faster than that of isolates from other clusters or nonclustered isolates. The purpose of this study was to identify the sites of IS6110 insertions in strain 210 and compare these to IS6110 insertion sites in strain W. Our hypothesis is that an IS6110 insertion site(s) could possibly be responsible for a strain's increased capacity for transmission and/or replication. In this report, the insertion sites in strains 210 and W are described and referenced to their location in the M. tuberculosis H37Rv genome sequence. The W and 210 strains have 17 identical sites of IS6110 insertion and additional sequence not found in H37Rv but present in other clinical isolates. The IS6110 insertion site in the 36-bp direct repeat (DR) region of strains 210 and W has 15 spacers in the left flanking region. The DR region on the right side of IS6110 has been deleted. Five sites of insertion in strain 210 not found in strain W are described, as well as two unique sites in strain W. One copy of IS6110 was found to reside 55 bp in the ctpD gene. This gene is expressed, indicating that IS6110 can provide a promoter sequence for the transcription of genes.

* Corresponding author. Mailing address: John L. McClellan Memorial Veterans Hospital, Medical Research Department, Slot 151, Room GB 126, 4300 W. 7th St., Little Rock, AR 72205. Phone: (501) 257-4826. Fax: (501) 664-6748. E-mail: BeggsMarjorieL{at}exchange.uams.edu.

Journal of Clinical Microbiology, August 2000, p. 2923-2928, Vol. 38, No. 8
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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