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Genomic comparisons of Salmonella enterica serovar Enteritidis isolates

ABSTRACT: Comparative genomic hybridization of a temporally and locally diverse set of S. enterica ssp I serovar Enteritidis isolates, and some closely related serovar Dublin and Gallinarum strains, to the sequenced Enteritidis PT4 Keywords: other

ORGANISM(S): Salmonella Salmonella enterica subsp. enterica Salmonella enterica

PROVIDER: GSE2242 | GEO | 2005/08/06

SECONDARY ACCESSION(S): PRJNA91509

REPOSITORIES: GEO

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Genomic comparisons of Salmonella enterica serovar Enteritidis isolates

Project description:Comparative genomic hybridization of a temporally and locally diverse set of S. enterica ssp I serovar Enteritidis isolates, and some closely related serovar Dublin and Gallinarum strains, to the sequenced Enteritidis PT4

2005-08-06 | E-GEOD-2242 | biostudies-arrayexpress

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Genomic comparisons of Salmonella enterica serovar Paratyphi A isolates

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Project description:Even though the incidence of salmonellosis in humans has decreased over the last years, Salmonella spp. are still a leading cause of foodborne outbreaks in Europe (Anon., 2014). Of more than 2500 different serovars of Salmonella enterica, S. enterica serovar Enteritidis (S. Enteritidis) is the most frequently reported serovar in relation to food borne disease, and egg and egg products are the most important vehicles (Anon., 2014). It has recently been shown that S. Enteritidis is superior to other serovars tested regarding survival in egg white, which may explain why many egg borne outbreaks are caused by this serovar (De Vylder et al., 2013). The genetic background for this apparent better adaptation to survival in egg is only partially known. The aim of this work was to carry out gene expression analysis in order to understand how S. Enteritidis adapts to growth in the hostile environment of egg. This study analyzed gene expression of this bacterium during growth in whole egg, and whether highly expressed genes were essential for the growth. High quality RNA was extracted from S. Enteritidis using an improved modified RNA-extraction protocol. Global gene expression during growth in whole egg was compared to growth in LB-medium using DNA array method. Twenty-six genes were significantly upregulated during growth in egg; these belonged to amino acids biosynthesis, di/oligopeptide transport system, biotin synthesis, ferrous iron transport system, and type III secretion system. Significant downregulation of 15 genes related to formate hydrogenlyase (FHL) and trehalose metabolism was observed. The results suggested that S. Enteritidis is starved for amino-acids, biotin and iron when growing in egg.

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Gene expression response of Salmonella enterica serovar Enteritidis phage type 8 to subinhibitory concentrations of trans-cinnamaldehyde and eugenol

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Comparative genomic hybridization of strains of Salmonella enterica serovar Enteritidis from Uruguay, other distant geographical regions and other serovars isolated in Uruguay

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