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Colonisation dynamics of Listeria monocytogenes strains isolated from food production environments

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Gray, J, Chandry, PS, Kaur, M, Kocharunchitt, C ORCID: 0000-0003-3919-2401, Fanning, S, Bowman, JP ORCID: 0000-0002-4528-9333 and Fox, EM 2021 , 'Colonisation dynamics of Listeria monocytogenes strains isolated from food production environments' , Scientific Reports, vol. 11, no. 1 , pp. 1-17 , doi: 10.1038/s41598-021-91503-w.

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Abstract

Listeria monocytogenes is a ubiquitous bacterium capable of colonising and persisting within food production environments (FPEs) for many years, even decades. This ability to colonise, survive and persist within the FPEs can result in food product cross-contamination, including vulnerable products such as ready to eat food items. Various environmental and genetic elements are purported to be involved, with the ability to form biofilms being an important factor. In this study we examined various mechanisms which can influence colonisation in FPEs. The ability of isolates (n = 52) to attach and grow in biofilm was assessed, distinguishing slower biofilm formers from isolates forming biofilm more rapidly. These isolates were further assessed to determine if growth rate, exopolymeric substance production and/or the agr signalling propeptide influenced these dynamics and could promote persistence in conditions reflective of FPE. Despite no strong association with the above factors to a rapid colonisation phenotype, the global transcriptome suggested transport, energy production and metabolism genes were widely upregulated during the initial colonisation stages under nutrient limited conditions. However, the upregulation of the metabolism systems varied between isolates supporting the idea that L. monocytogenes ability to colonise the FPEs is strain-specific.

Item Type: Article
Authors/Creators:Gray, J and Chandry, PS and Kaur, M and Kocharunchitt, C and Fanning, S and Bowman, JP and Fox, EM
Keywords: Listeria monocytogenes, food production environments
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
DOI / ID Number: 10.1038/s41598-021-91503-w
Copyright Information:

Copyright 2021 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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