The invasome of Salmonella Dublin as revealed by whole genome sequencing

Mohammed, M., Le Hello, S., Leekitcharoenphon, P. and Hendriksen, R. 2017. The invasome of Salmonella Dublin as revealed by whole genome sequencing . BMC Infectious Diseases. 17, p. 544. doi:10.1186/s12879-017-2628-x

TitleThe invasome of Salmonella Dublin as revealed by whole genome sequencing
AuthorsMohammed, M., Le Hello, S., Leekitcharoenphon, P. and Hendriksen, R.
Abstract

Background
Salmonella enterica serovar Dublin is a zoonotic infection that can be transmitted from cattle to humans through consumption of contaminated milk and milk products. Outbreaks of human infections by S. Dublin have been reported in several countries including high-income countries. A high proportion of S. Dublin cases in humans are associated with invasive disease and systemic illness. The genetic basis of virulence in S. Dublin is not well characterized.
Methods
Whole genome sequencing was applied to a set of clinical invasive and non-invasive S. Dublin isolates from different countries in order to characterize the putative genetic determinants involved in the virulence and invasiveness of S. Dublin in humans.
Results
We identified several virulence factors that form the bacterial invasome and may
contribute to increasing bacterial virulence and pathogenicity including mainly Gifsy-2 prophage, two different type 6 secretion systems (T6SSs) harbored by Salmonella pathogenicity islands; SPI-6 and SPI-19 respectively and virulence genes; ggt and PagN. Although Vi antigen and the virulence plasmid have been reported previously to contribute to the virulence of S. Dublin we did not detect them in all invasive isolates indicating that they are not the main virulence determinants in S. Dublin.
Conclusion
Several virulence factors within the genome of S. Dublin might contribute to the ability of S. Dublin to invade humans’ blood but there were no genomic markers that differentiate invasive from non-invasive isolates suggesting that host immune response play a crucial role in the clinical outcome of S. Dublin infection.

KeywordsSalmonella Dublin; Virulence; SPI-6; SPI-19; T6SS; Vi antigen; PagN; ggt; Gifsy-2
Article number544
JournalBMC Infectious Diseases
Journal citation17, p. 544
ISSN1471-2334
Year2017
PublisherBioMed Central
Publisher's versionMohammed_article.pdf
Digital Object Identifier (DOI)doi:10.1186/s12879-017-2628-x
Publication dates
Published04 Aug 2017
LicenseCC BY 4.0

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