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Journal of Clinical Microbiology, May 1999, p. 1274-1279, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Predictive Fluorescent Amplified-Fragment Length Polymorphism Analysis of Escherichia coli: High-Resolution Typing Method with Phylogenetic Significance

Catherine Arnold,1,* Lou Metherell,1,dagger Geraldine Willshaw,2 Anthony Maggs,3 and John Stanley1

Molecular Biology Unit1 and Laboratory of Enteric Pathogens,2 Central Public Health Laboratory, London NW9 5HT, and Department of Microbiology and Immunology, University of Leicester School of Medicine, Leicester LE19HN,3 United Kingdom

Received 10 November 1998/Returned for modification 17 December 1998/Accepted 26 January 1999

The fluorescent amplified-fragment length polymorphism (FAFLP) assay potentially amplifies a unique set of genome fragments from each bacterial clone. It uses stringently hybridizing primers which carry a fluorescent label. Precise fragment sizing is achieved by the inclusion of an internal size standard in every lane. Therefore, a unique genotype identifier(s) can be found in the form of fragments of precise size or sizes, and these can be generated reproducibly. In order to evaluate the potential of FAFLP as an epidemiological typing method with a valid phylogenetic basis, we applied it to 87 strains of Escherichia coli. These comprised the EcoR collection, which has previously been classified by multilocus enzyme electrophoresis (MLEE) and which represents the genetic diversity of the species E. coli, plus 15 strains of the clinically important serogroup O157. FAFLP with an unlabelled nonselective EcoRI primer (Eco+0) and a labelled selective MseI primer (Mse+TA) gave strain-specific profiles. Fragments of identical sizes (in base pairs) were assumed to be identical, and the genetic distances between the strains were calculated. A phylogenetic tree derived from measure of distance correlated closely with the MLEE groupings of the EcoR collection and placed the verocytotoxin-producing O157 strains on an outlier branch. Our data indicate that FAFLP is suitable for epidemiological investigation of E. coli infection, providing well-defined and reproducible identifiers of genotype for each strain. Since FAFLP objectively samples the whole genome, each strain or isolate can be assigned a place within the broad context of the whole species and can also be subjected to a high-resolution comparison with closely related strains to investigate epidemiological clonality.

* Corresponding author. Mailing address: Molecular Biology Unit, Central Public Health Laboratory, 61 Colindale Ave., London NW9 5HT, United Kingdom. Phone: (44) 0181 200 4400. Fax: (44) 0181 200 1569. E-mail: carnold{at}hgmp.mrc.ac.uk.

dagger Present address: Department of Endocrinology, St. Bartholemew's Hospital, London EC1A 7BE, United Kingdom.

Journal of Clinical Microbiology, May 1999, p. 1274-1279, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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