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Comparative Genomic Analysis of PhoP Regulon in S. Typhi and S. Typhimurium

ABSTRACT: Transcriptional profiling of three sequenced S. enterica strains: S. Typhimurium LT2, S. Typhi CT18, and S. Typhi Ty2 in PhoP-inducing and non-inducing conditions in vitro, and compared these results to profiles of phoP-/Q- mutants derived from S. Typhimurium LT2 and S. Typhi Ty2.

ORGANISM(S): Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 Salmonella enterica subsp. enterica serovar Typhi str. CT18 Salmonella enterica subsp. enterica serovar Typhi str. Ty2

PROVIDER: GSE17670 | GEO | 2009/08/19

SECONDARY ACCESSION(S): PRJNA118477

REPOSITORIES: GEO

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Comparative Genomic Analysis of PhoP Regulon in S. Typhi and S. Typhimurium

Project description:Transcriptional profiling of three sequenced S. enterica strains: S. Typhimurium LT2, S. Typhi CT18, and S. Typhi Ty2 in PhoP-inducing and non-inducing conditions in vitro, and compared these results to profiles of phoP-/Q- mutants derived from S. Typhimurium LT2 and S. Typhi Ty2. Two-condition experiment: Each strain above was grown in PhoP-inducing (Low Magnesium concentration) and PhoP non-inducing conditions (High Magnesium concentration) with 1 dye reversal.

2010-05-06 | E-GEOD-17670 | biostudies-arrayexpress

S.enterica_log_vs_overnight_DNA

Project description:Gene content comparison of Salmonella enterica sv Typhimurium LT2, sv Typhi CT18 and sv Typhi TY2 cultures grown to log phase versus cultures grown overnight Keywords: parallel sample

2004-05-10 | GSE819 | GEO

S.enterica_log_vs_overnight_DNA

Project description:Gene content comparison of Salmonella enterica sv Typhimurium LT2, sv Typhi CT18 and sv Typhi TY2 cultures grown to log phase versus cultures grown overnight

2010-06-09 | E-GEOD-819 | biostudies-arrayexpress

Comparative Genomic Analysis of PhoP Regulon in S. Typhi and S. Typhimurium

Project description:Comparative Genomic Analysis of PhoP Regulon in S. Typhi and S. Typhimurium

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Comparative analysis of Salmonella Typhi, Paratyphi A, Enteritidis and Typhimurium core proteomes

Project description:Salmonella enterica subsp. enterica contains more than 2,600 serovars of which four are of major medical relevance for humans. While the typhoidal serovars (Typhi and Paratyphi A) are human-restricted and cause enteric fever, non-typhoidal Salmonella serovars (Typhimurium and Enteritidis) have a broad host range and predominantly cause gastroenteritis. In this study, we compared the core proteomes of Salmonella Typhi, Paratyphi A, Typhimurium and Enteritidis using contemporary proteomics. Five isolates, covering different geographical origins, and one reference strain per serovar were grown in vitro to the exponential phase. Protein levels of orthologous proteins between serovars were compared and subjected to gene ontology term enrichment and inferred regulatory interactions. Differential expression of the core proteomes of the typhoidal serovars appears mainly related to cell surface components and, for the non-typhoidal serovars, to pathogenicity. Our findings may guide future development of novel diagnostics and vaccines, and understanding of disease progression.

2019-05-13 | PXD011154 | Pride

Transcription profiling of intracellular Salmonella enterica serovar Typhimurium phoP mutant inside fibroblast cells

Project description:Transcriptomic analysis of intracellular Salmonella enterica serovar Typhimurium phoP mutant inside fibroblast cells

2010-12-01 | E-MEXP-1774 | biostudies-arrayexpress

Comparison of genes regulated by TviA in S. Typhi and Typhimurium

Project description:Bacterial pathogens causing systemic disease commonly evolve from organisms associated with localized infections but differ from their close relatives in their ability to overcome mucosal barriers by mechanisms that remain incompletely understood. Here we investigated whether acquisition of a regulatory gene, tviA, contributed to the ability of Salmonella enterica serotype Typhi to disseminate from the intestine to systemic sites of infection during typhoid fever. To study the consequences of acquiring a new regulator by horizontal gene transfer, tviA was introduced into the chromosome of S. enterica serotype Typhimurium, a closely related pathogen causing a localized gastrointestinal infection in immunocompetent individuals. Modulation of gene expression by TviA in serotype Typhi and Typhimurium was determined by profiling and found to be very comparable. Expression of flagellin, a pathogen associated molecular pattern (PAMP), was repressed by TviA when bacteria were grown at osmotic conditions encountered in tissue, but not at higher osmolarity present in the intestinal lumen. TviA-mediated flagellin repression enabled bacteria to evade sentinel functions of human model epithelia and resulted in increased bacterial dissemination to the spleen in a chicken model.

2010-07-07 | GSE20321 | GEO

Effect of obacunone on Salmonella Typhimurium transcriptome

Project description:Obacunone is a limonoids present in Citrus species. We previously reported that obacunone was inhibitory to the cell-cell signaling in Vibrio harveyi and Escherichia coli O157:H7. In the present work we evaluated the effect of obacunone on the food borne pathogen Salmonella Typhimurium LT2 using cDNA microarray. The results demonstrate that obacunone exerts an antivirulence effect on S. Typhimurium LT2 by repressing SPI1 and SPI2. Furthermore, the effect of obacunone seems to be dependent upon EnvZ.

2012-08-21 | GSE37234 | GEO

Transcriptome analysis of Salmonella enterica serovar Typhimurium growth in physiological murine bile

Project description:Infection with Salmonella enterica serovar Typhi in humans causes the systemic, life-threatening disease typhoid fever. In the laboratory, typhoid fever can be modeled through the inoculation of susceptible mice with Salmonella enterica serovar Typhimurium. The ensuing disease is characterized by systemic dissemination and colonization of many organs, including the liver, spleen and gallbladder. Using this murine model, we previously characterized the interactions between Salmonella Typhimurium and host cells in the gallbladder and showed that this pathogen can successfully invade gallbladder epithelial cells and proliferate. Additionally, we showed that Salmonella Typhimurium can use bile phospholipids to grow at high rates. These abilities are likely important for quick colonization of the gallbladder during typhoid fever and further pathogen dissemination through fecal shedding. To further characterize the interactions between Salmonella and the gallbladder environment we compared the transcriptome of Salmonella cultures grown in LB or physiological murine bile. Our data showed that many genes involved in bacterial central metabolism are affected by bile, with the citric acid cycle being repressed and alternative respiratory systems being activated. Additionally, our study revealed a new aspect of Salmonella interactions with bile through the identification of phoP as a bile-responsive gene. Repression of phoP expression does not involve PhoPQ sensing of a bile component. Due to its critical role in Salmonella virulence, further studies in this area will likely reveal aspects of the interaction between Salmonella and bile that are relevant to disease.

2011-11-10 | GSE33604 | GEO

Expression analysis of Salmonella typhimurium LT2 TA100 upon exposure to C60

Project description:Investigation of gene expression level changes in Salmonella typhimurium LT2 TA100 upon exposure to C60, compared to unexposed controls. The mutations engineered into this strain make it susceptile to mutagenic compounds. The Salmonella typhimurium TA100 strain used in this study is further described in Pedersen P, Thomsen E, Stern RM. 1983. Detection by Replica Plating of False Revertant Colonies Induced in the Salmonella Mammalian Microsome Assay by Hexavalent Chromium. Environmental health perspectives 51: 227-230. A 4 x 72K array study using total RNA recovered from triplicate cultures of Salmonella typhimurium LT2 TA100 exposed to C60 and triplicate cultures of controls that were not exposed to C60. Each 72K array measures the expression level of 4,504 genes from Salmonella typhimurium LT2 with seven 45 to 60-mer probe pairs per gene.

2012-09-01 | E-GEOD-35750 | biostudies-arrayexpress

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