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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

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PhD thesis of Morgan Guilbaud (2004-2007)

Listeria monocytogenes in the seafood products industries : quantification, virulence and response to the smoke stress

The identification of the Listeria monocytogenes risk in the seafood products industry is based on epidemiological data and development of methodological tools to understand the pathogen’s behaviour in the products and their processing environments. This project first consisted in developing quantification of L. monocytogenes and genes expression methods that could be applied to the study of L. monocytogenes ‘behaviour in the seafood products and their environment. The first method allowed quantifying L. monocytogenes using a real time PCR assay targeting the hly gene of the listeriolysin. This method allowed detecting and quantifying L. monocytogenes growing in biofilms without requiring an enrichment step. Then we developed a quantification method of the virulence genes expression with a Quantitative Reverse Transcription PCR assay which is a tool to study the effect of environmental conditions, especially on hly gene expression. To improve data on virulence of L. monocytogenes strains isolated from seafood products industries, about thirty isolates from different products and geographical origins were tested for virulence. Results showed that only one isolate originating from smoked salmon had an attenuation of virulence and all the others were virulent. Finally, we studied the L. monocytogenes response to the seafood products smoking with a proteomic approach. No adaptive response would be developed by the pathogen during smoking, but the smoke applied allowed the inhibition of the listeriolysin activity, showing a potential effect of the smoke on the virulence.