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Journal of Bacteriology, August 2005, p. 5537-5551, Vol. 187, No. 16
0021-9193/05/$08.00+0     doi:10.1128/JB.187.16.5537-5551.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Evolution and Molecular Phylogeny of Listeria monocytogenes Isolated from Human and Animal Listeriosis Cases and Foods

K. K. Nightingale, K. Windham, and M. Wiedmann*

Department of Food Science, Cornell University, Ithaca, New York

Received 2 November 2004/ Accepted 19 May 2005

To probe the evolution and phylogeny of Listeria monocytogenes from defined host species and environments, L. monocytogenes isolates from human (n = 60) and animal (n = 30) listeriosis cases and food samples (n = 30) were randomly selected from a larger collection of isolates (n = 354) obtained in New York State between 1999 and 2001. Partial sequencing of four housekeeping genes (gap, prs, purM, and ribC), one stress response gene (sigB), and two virulence genes (actA and inlA) revealed between 11 (gap) and 33 (inlA) allelic types as well as 52 sequence types (unique combination of allelic types). actA, ribC, and purM demonstrated the highest levels of nucleotide diversity ({pi} > 0.05). actA and inlA as well as prs and the hypervariable housekeeping genes ribC and purM showed evidence of horizontal gene transfer and recombination. actA and inlA also showed evidence of positive selection at specific amino acid sites. Maximum likelihood phylogenies for all seven genes confirmed that L. monocytogenes contains two deeply separated evolutionary lineages. Lineage I was found to be highly clonal, while lineage II showed greater diversity and evidence of horizontal gene transfer. Allelic types were exclusive to lineages, except for a single gap allele, and nucleotide distance within lineages was much lower than that between lineages, suggesting that genetic exchange between lineages is rare. Our data show that (i) L. monocytogenes is a highly diverse species with at least two distinct phylogenetic lineages differing in their evolutionary history and population structure and (ii) horizontal gene transfer as well as positive selection contributed to the evolution of L. monocytogenes.

* Corresponding author. Mailing address: Department of Food Science, Cornell University, 412B Stocking Hall, Ithaca, NY 14853. Phone: (607) 254-2838. Fax: (607) 254-4868. E-mail: mw16{at}cornell.edu.

Journal of Bacteriology, August 2005, p. 5537-5551, Vol. 187, No. 16
0021-9193/05/$08.00+0     doi:10.1128/JB.187.16.5537-5551.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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