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Journal of Clinical Microbiology, February 2003, p. 632-639, Vol. 41, No. 2
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.2.632-639.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Mixed-Genome Microarrays Reveal Multiple Serotype and Lineage-Specific Differences among Strains of Listeria monocytogenes

Douglas R. Call,1* Monica K. Borucki,1,2 and Thomas E. Besser1

Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164-7040,1 Animal Disease Research Unit, Agricultural Research Service, United States Department of Agriculture, Pullman, Washington 99164-66302

Received 5 August 2002/ Returned for modification 6 October 2002/ Accepted 22 November 2002

Epidemiological studies and analysis of putative virulence genes have shown that Listeria monocytogenes has diverged into several phylogenetic divisions. We hypothesize that similar divergence has occurred for many genes that influence niche-specific fitness and virulence and that identifying these differences may offer new opportunities for the detection, treatment, and control of this important pathogen. To explore this issue further, we developed a microarray composed of fragmented DNA taken from 10 strains of L. monocytogenes. We then hybridized genomic DNA from 50 different strains to replicate arrays and analyzed the resulting hybridization patterns. A simple Euclidean distance metric permitted the reconstruction of previously described genetic relationships between serotypes, and only four microarray probes were needed to discriminate between the most important serotypes (1/2a, 1/2b, 1/2c, and 4). We calculated an index of linkage equilibrium from the microarray data and confirmed that L. monocytogenes has a strongly clonal population structure (IA = 3.85). Twenty-nine informative probes were retrieved from the library and sequenced. These included genes associated with repairing UV-damaged DNA, salt tolerance, biofilm formation, heavy metal transport, ferrous iron transport, and teichoic acid synthesis. Several membrane-bound lipoproteins and one internalin were identified, plus three phage sequences and six sequences with unknown function. Collectively, these data confirm that many genes have diverged between lineages of L. monocytogenes. Furthermore, these results demonstrate the value of mixed-genome microarrays as a tool for deriving biologically useful information and for identifying and screening genetic markers for clinically important microbes.

* Corresponding author. Mailing address: Dept. Vet. Micro. Path., 402 Bustad Hall, Pullman, WA 99164-7040. Phone: (509) 335-6313. Fax: (509) 335-8529. E-mail: drcall{at}wsu.edu.

Journal of Clinical Microbiology, February 2003, p. 632-639, Vol. 41, No. 2
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.2.632-639.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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