Enhanced biofilm and extracellular matrix production by chronic carriage versus acute isolates of Salmonella Typhi

Devaraj, Aishwarya, González, Juan F., Eichar, Bradley, Thilliez, Gatan, Kingsley, Robert A., Baker, Stephen, Allard, Marc W., Bakaletz, Lauren O., Gunn, John S. and Goodman, Steven D. (2021) Enhanced biofilm and extracellular matrix production by chronic carriage versus acute isolates of Salmonella Typhi. PLoS Pathogens, 17 (1). ISSN 1553-7374

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Abstract

Salmonella Typhi is the primary causative agent of typhoid fever; an acute systemic infection that leads to chronic carriage in 3–5% of individuals. Chronic carriers are asymptomatic, difficult to treat and serve as reservoirs for typhoid outbreaks. Understanding the factors that contribute to chronic carriage is key to development of novel therapies to effectively resolve typhoid fever. Herein, although we observed no distinct clustering of chronic carriage isolates via phylogenetic analysis, we demonstrated that chronic isolates were phenotypically distinct from acute infection isolates. Chronic carriage isolates formed significantly thicker biofilms with greater biomass that correlated with significantly higher relative levels of extracellular DNA (eDNA) and DNABII proteins than biofilms formed by acute infection isolates. Importantly, extracellular DNABII proteins include integration host factor (IHF) and histone-like protein (HU) that are critical to the structural integrity of bacterial biofilms. In this study, we demonstrated that the biofilm formed by a chronic carriage isolate in vitro, was susceptible to disruption by a specific antibody against DNABII proteins, a successful first step in the development of a therapeutic to resolve chronic carriage.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 02 Feb 2021 01:03
Last Modified: 13 May 2021 16:14
URI: https://ueaeprints.uea.ac.uk/id/eprint/79135
DOI: 10.1371/journal.ppat.1009209

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