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Journal of Clinical Microbiology, December 2004, p. 5549-5557, Vol. 42, No. 12
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.12.5549-5557.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Differentiation of Campylobacter coli, Campylobacter jejuni, Campylobacter lari, and Campylobacter upsaliensis by a Multiplex PCR Developed from the Nucleotide Sequence of the Lipid A Gene lpxA

John D. Klena,1,2* Craig T. Parker,3 Krista Knibb,1 J. Claire Ibbitt,1 Phillippa M. L. Devane,4 Sharon T. Horn,3 William G. Miller,3 and Michael E. Konkel2

Department of Plant and Microbial Sciences, University of Canterbury,1 Institute for Environmental Science and Research, Limited, Christchurch Science Centre, Christchurch, New Zealand,4 School of Molecular Biosciences, Washington State University, Pullman, Washington,2 United States Department of Agriculture, Western Regional Research Center, Albany, California3

Received 11 May 2004/ Returned for modification 4 July 2004/ Accepted 7 August 2004

We describe a multiplex PCR assay to identify and discriminate between isolates of Campylobacter coli, Campylobacter jejuni, Campylobacter lari, and Campylobacter upsaliensis. The C. jejuni isolate F38011 lpxA gene, encoding a UDP-N-acetylglucosamine acyltransferase, was identified by sequence analysis of an expression plasmid that restored wild-type lipopolysaccharide levels in Escherichia coli strain SM105 [lpxA(Ts)]. With oligonucleotide primers developed to the C. jejuni lpxA gene, nearly full-length lpxA amplicons were amplified from an additional 11 isolates of C. jejuni, 20 isolates of C. coli, 16 isolates of C. lari, and five isolates of C. upsaliensis. The nucleotide sequence of each amplicon was determined, and sequence alignment revealed a high level of species discrimination. Oligonucleotide primers were constructed to exploit species differences, and a multiplex PCR assay was developed to positively identify isolates of C. coli, C. jejuni, C. lari, and C. upsaliensis. We characterized an additional set of 41 thermotolerant isolates by partial nucleotide sequence analysis to further demonstrate the uniqueness of each species-specific region. The multiplex PCR assay was validated with 105 genetically defined isolates of C. coli, C. jejuni, C. lari, and C. upsaliensis, 34 strains representing 12 additional Campylobacter species, and 24 strains representing 19 non-Campylobacter species. Application of the multiplex PCR method to whole-cell lysates obtained from 108 clinical and environmental thermotolerant Campylobacter isolates resulted in 100% correlation with biochemical typing methods.


* Corresponding author. Present address: NAMRU-3, PSC 452, Box 154, FPO, 4E, 09835, Cairo, Egypt. E-mail: KlenaJ{at}NAMRU3.org.


Journal of Clinical Microbiology, December 2004, p. 5549-5557, Vol. 42, No. 12
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.12.5549-5557.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.




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