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Journal of Bacteriology, September 1998, p. 4963-4966, Vol. 180, No. 18
Division of Bacterial Products, Center for
Biologics Evaluation and Research, Food and Drug Administration,
Bethesda, Maryland 20892
Received 23 February 1998/Accepted 12 July 1998
The insertion sequence IS481 and its isoform
IS1002 have been observed to transpose into the
bvgAS locus of Bordetella pertussis, for which
the DNA sequence has previously been determined. Upon insertion of
IS481 at three different sites and IS1002 at
one site, a 6-bp sequence originally present was found at the junction of bvg and insertion sequence DNA. This indicates that,
contrary to prior reports, IS481 and IS1002 do
create a duplication upon insertion. In this light, examination of
these and other examples of IS481 and IS1002
reported in the literature leads to the observation that the 6-bp
recognition sequence usually fits the consensus NCTAGN. The
near-palindromic nature of this sequence, when directly repeated at the
ends of IS481 or IS1002, apparently led to the interpretation that 5 of these base pairs were part of the terminal inverted repeats flanking these elements.
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
IS481 and IS1002 of
Bordetella pertussis Create a 6-Base-Pair Duplication
upon Insertion at a Consensus Target Site
*
Mailing address: Division of Bacterial Products, Center
for Biologics Evaluation and Research, Food and Drug Administration, 8800 Rockville Pike, Bethesda, MD 20892. Phone: (301) 496-1785. Fax:
(301) 402-2776. E-mail: stibitz{at}helix.nih.gov.
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