A population genetics-based and phylogenetic approach to understanding the evolution of virulence in the genus Listeria.

Applied and Environmental Microbiology
Henk C den BakkerMartin Wiedmann

Abstract

The genus Listeria includes (i) the opportunistic pathogens L. monocytogenes and L. ivanovii, (ii) the saprotrophs L. innocua, L. marthii, and L. welshimeri, and (iii) L. seeligeri, an apparent saprotroph that nevertheless typically contains the prfA virulence gene cluster. A novel 10-loci multilocus sequence typing scheme was developed and used to characterize 67 isolates representing six Listeria spp. (excluding L. grayi) in order to (i) provide an improved understanding of the phylogeny and evolution of the genus Listeria and (ii) use Listeria as a model to study the evolution of pathogenicity in opportunistic environmental pathogens. Phylogenetic analyses identified six well-supported Listeria species that group into two main subdivisions, with each subdivision containing strains with and without the prfA virulence gene cluster. Stochastic character mapping and phylogenetic analysis of hly, a gene in the prfA cluster, suggest that the common ancestor of the genus Listeria contained the prfA virulence gene cluster and that this cluster was lost at least five times during the evolution of Listeria, yielding multiple distinct saprotrophic clades. L. welshimeri, which appears to represent the most ancient clade that arose from ...Continue Reading

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Citations

Sep 6, 2012·Proceedings of the National Academy of Sciences of the United States of America·Michel Tibayrenc, Francisco J Ayala
Apr 17, 2012·Applied and Environmental Microbiology·Brian D SaudersMartin Wiedmann
Nov 13, 2012·Applied and Environmental Microbiology·Laura K StrawnPeter W Bergholz
Jul 5, 2013·PloS One·Henk C den BakkerMartin Wiedmann
Mar 13, 2014·BMC Microbiology·Evelyn M ClaytonPaul R Ross
Oct 1, 2013·Applied and Environmental Microbiology·Laura K StrawnMartin Wiedmann
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Mar 17, 2021·Biochimica Et Biophysica Acta. Biomembranes·Nejc PetrišičGregor Anderluh

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