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Applied and Environmental Microbiology, June 2003, p. 3308-3310, Vol. 69, No. 6
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.6.3308-3310.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Characterization of Urease-Positive Thermophilic Campylobacter Subspecies by Multilocus Enzyme Electrophoresis Typing

Motoo Matsuda,1 Aki Kaneko,1 Timothy Stanley,2 B. Cherie Millar,2 M. Miyajima,1 Philip G. Murphy,2 and John E. Moore2*

Laboratory of Molecular Biology, School of Environmental Health Sciences, Azabu University, Sagamihara 229, Japan,1 Northern Ireland Public Health Laboratory, Belfast City Hospital, Belfast BT9 7AD, Northern Ireland, United Kingdom2

Received 9 September 2002/ Accepted 19 February 2003

Thirty-one urease-positive thermophilic Campylobacter (UPTC) isolates, including three reference strains (NCTC12892, NCTC12895 and NCTC12896), and three Campylobacter lari isolates, which were isolated from several countries and sources, were compared genotypically by using multilocus enzyme electrophoresis (MLEE). We examined allelic variation around seven enzyme loci, including the adenylate kinase, alkaline phosphatase, catalase, fumarase, malic enzyme, malate dehydrogenase, and L-phenylalanyl-L-leucine peptidase loci. MLEE typing revealed the presence of 23 different electrophoretic types (ETs) among the 31 UPTC isolates, and 14 isolates shared six electrophoretic profiles. Three different ETs were identified for the three C. lari isolates examined, and no ETs were shared by UPTC and C. lari isolates. Quantitative analyses were subsequently performed by using allelic variation data, and the results demonstrated that the mean genetic diversity was 0.655. In conclusion, MLEE demonstrated that the UPTC isolates examined are genetically hypervariable and form a cluster separate from the C. lari cluster.


* Corresponding author. Mailing address: Northern Ireland Public Health Laboratory, Belfast City Hospital, Belfast BT9 7AD, Northern Ireland, United Kingdom. Phone: 44(28) 9026 3554. Fax: 44(28) 2589 2887. E-mail: jemoore{at}niphl.dnet.co.uk.


Applied and Environmental Microbiology, June 2003, p. 3308-3310, Vol. 69, No. 6
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.6.3308-3310.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.




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