Extracellular DNA, cell surface proteins and c-di-GMP promote biofilm formation in Clostridioides difficile - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Scientific Reports Année : 2021

Extracellular DNA, cell surface proteins and c-di-GMP promote biofilm formation in Clostridioides difficile

Lisa F. Dawson
  • Fonction : Auteur
Catherine L. Hall
  • Fonction : Auteur
Mark A. Harrison
  • Fonction : Auteur
Maria Derakhshan
  • Fonction : Auteur
Helen A. Shaw
  • Fonction : Auteur
Neil F. Fairweather
  • Fonction : Auteur
Brendan W. Wren
  • Fonction : Auteur

Résumé

Clostridioides difficile is the leading cause of nosocomial antibiotic-associated diarrhoea worldwide, yet there is little insight into intestinal tract colonisation and relapse. In many bacterial species, the secondary messenger cyclic-di-GMP mediates switching between planktonic phase, sessile growth and biofilm formation. We demonstrate that c-di-GMP promotes early biofilm formation in C. difficile and that four cell surface proteins contribute to biofilm formation, including two c-di-GMP regulated; CD2831 and CD3246, and two c-di-GMP-independent; CD3392 and CD0183. We demonstrate that C. difficile biofilms are composed of extracellular DNA (eDNA), cell surface and intracellular proteins, which form a protective matrix around C. difficile vegetative cells and spores, as shown by a protective effect against the antibiotic vancomycin. We demonstrate a positive correlation between biofilm biomass, sporulation frequency and eDNA abundance in all five C. difficile lineages. Strains 630 (RT012), CD305 (RT023) and M120 (RT078) contain significantly more eDNA in their biofilm matrix than strains R20291 (RT027) and M68 (RT017). DNase has a profound effect on biofilm integrity, resulting in complete disassembly of the biofilm matrix, inhibition of biofilm formation and reduced spore germination. The addition of exogenous DNase could be exploited in treatment of C. difficile infection and relapse, to improve antibiotic efficacy.

Dates et versions

hal-03141623 , version 1 (15-02-2021)

Identifiants

Citer

Lisa F. Dawson, Johann Peltier, Catherine L. Hall, Mark A. Harrison, Maria Derakhshan, et al.. Extracellular DNA, cell surface proteins and c-di-GMP promote biofilm formation in Clostridioides difficile. Scientific Reports, 2021, 11 (1), pp.3244. ⟨10.1038/s41598-020-78437-5⟩. ⟨hal-03141623⟩
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