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Journal of Clinical Microbiology, Sep 1997, 2386-2392, Vol 35, No. 9
CS Harrington, FM Thomson-Carter and PE Carter
The flagellin subunit of the flagellar filament in Campylobacter jejuni is
encoded by two highly homologous tandem genes, flaA and flaB. The flaA gene
was sequenced in 18 strains of C. jejuni, including isolates from three
outbreak groups. Sequences obtained were compared with flaA sequences
available in the GenBank database, and all were analyzed for mosaic gene
structure by using recently described statistical tests for detecting gene
conversion among aligned sets of sequences. Strong evidence was found
supporting recombination between flaA genes of different strains (i.e.,
intergenomic recombination). Intragenomic recombination between the flaA
and flaB genes of C. jejuni TGH9011 was also demonstrated. Both mechanisms
of recombination may act as a potential means by which pathogenic strains
can generate increased antigenic diversity, so allowing them to escape the
immunological responses of the host. Furthermore, demonstration of
recombination within and between flagellin loci of natural strains suggests
that flagellin gene typing (restriction fragment length polymorphism
analysis of PCR-amplified flagellin genes) cannot be considered a stable
method for long-term monitoring of pathogenic Campylobacter populations.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Evidence for recombination in the flagellin locus of Campylobacter jejuni: implications for the flagellin gene typing scheme
Department of Medical Microbiology, University of Aberdeen, Scotland, United Kingdom. c.s.harrington@abdn.ac.uk
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