Relation between Biofilm and Virulence in Vibrio tapetis: A Transcriptomic Study

Type Article
Date 2018-12
Language English
Author(s) Rodrigues SophieORCID1, Paillard Christine2, Van Dillen Sabine3, Tahrioui Ali4, Berjeaud Jean-Marc5, Dufour Alain1, Bazire Alexis1
Affiliation(s) 1 : IUEM Univ Bretagne Sud, LBCM, EA 3884, F-56100 Lorient, France.
2 : Univ Brest, UBO, Lab Sci Environm Marin LEMAR, UMR6539,CNRS,IRD,Ifremer,Inst Univ Europeen Mer, F-29280 Plouzane, France.
3 : Danisco France SAS, DuPont Nutr & Hlth, BP10, F-86220 Dange St Romain, France.
4 : Univ Rouen Normandy, LMSM EA 4312, F-27000 Evreux, France.
5 : Univ Poitiers, Lab Ecol & Biol Interact EBI, UMR 7267, F-86000 Poitiers, France.
Source Pathogens (2076-0817) (Mdpi), 2018-12 , Vol. 7 , N. 4 , P. 92 (15p.)
DOI 10.3390/pathogens7040092
Keyword(s) biofilm, virulence, Vibrio tapetis, transcriptome, quorum sensing, type VI secretion system, brown ring disease

Marine pathogenic bacteria are able to form biofilms on many surfaces, such as mollusc shells, and they can wait for the appropriate opportunity to induce their virulence. Vibrio tapetis can develop such biofilms on the inner surface of shells of the Ruditapes philippinarum clam, leading to the formation of a brown conchiolin deposit in the form of a ring, hence the name of the disease: Brown Ring Disease. The virulence of V. tapetis is presumed to be related to its capacity to form biofilms, but the link has never been clearly established at the physiological or genetic level. In the present study, we used RNA-seq analysis to identify biofilm- and virulence-related genes displaying altered expression in biofilms compared to the planktonic condition. A flow cell system was employed to grow biofilms to obtain both structural and transcriptomic views of the biofilms. We found that 3615 genes were differentially expressed, confirming that biofilm and planktonic lifestyles are very different. As expected, the differentially expressed genes included those involved in biofilm formation, such as motility- and polysaccharide synthesis-related genes. The data show that quorum sensing is probably mediated by the AI-2/LuxO system in V. tapetis biofilms. The expression of genes encoding the Type VI Secretion System and associated exported proteins are strongly induced, suggesting that V. tapetis activates this virulence factor when living in biofilm

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