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Intra-macrophage transcriptome of Salmonella enterica serovar Typhimurium 4/74 using strand-specific RNA-seq

ABSTRACT: Bacterial transcription is controlled by many transcription factors and promoters. Currently many promoters are mapped only in in vitro conditions. We use an intra-macrophage model to map the promoters and their expression in vivo. InSPI2 is an in vitro growth condition mimicking intra-macrophage condition. We also characterize the transcriptome of Salmonella during growth in an in vitro intra-macrophage growth condition.

ORGANISM(S): Salmonella enterica subsp. enterica serovar Typhimurium str. ST4/74

PROVIDER: GSE59945 | GEO | 2015/07/30

SECONDARY ACCESSION(S): PRJNA257106

REPOSITORIES: GEO

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Intra-macrophage transcriptome of Salmonella enterica serovar Typhimurium 4/74 using strand-specific RNA-seq

Project description:Bacterial transcription is controlled by many transcription factors and promoters. Currently many promoters are mapped only in in vitro conditions. We use an intra-macrophage model to map the promoters and their expression in vivo. Transcriptome analysis of S.Typhimurium 4/74 within macrophages using RNA-seq in biological replicates. dRNA-seq also performed in biological replicates.

2015-07-30 | E-GEOD-59945 | biostudies-arrayexpress

Salmonella enterica serovar Typhimurium 4/74 transcriptomics using strand-specific RNA-seq

Project description:Bacterial transcription networks typically consist of hundreds of transcription factors and thousands of promoters. However, current attempts to map bacterial promoters have failed to report the true complexity of bacterial transcription. The differential RNA-seq (dRNA-seq) approaches only identified a subset of promoters because they involved few growth conditions. Here, we present a simplified approach for global promoter identification in bacteria, based upon the analysis of RNA-seq data from multiple environmental conditions. RNA was extracted from Salmonella enterica serovar Typhimurium (S. Typhimurium) grown in 22 different environmental conditions, which were devised to reflect the pathogenic lifestyle of S. Typhimurium. Individual RNA samples were combined into two pools for sequencing. In just two runs of strand-specific RNA-seq and dRNA-seq of the pooled sample we identified 3701 promoters (Pool sample). In further experiments, we found that individual in vitro conditions stimulate the expression of about 60% of the S. Typhimurium genome, whereas the suite of 22 conditions induced expression of 87% of S. Typhimurium genes. We discovered environmental conditions that induce many genes within Salmonella pathogenicity islands and identified 78 new sRNAs. In S. Typhimurium there is now experimental evidence for 280 sRNAs, and we classified them in terms of location and Hfq-binding.

2013-12-18 | GSE49829 | GEO

Salmonella enterica serovar Typhimurium 4/74 transcriptomics using strand-specific RNA-seq

2013-12-18 | E-GEOD-49829 | biostudies-arrayexpress

Salmonella enterica subsp. enterica serovar Typhimurium str. ST4/74

Project description:Intra-macrophage transcriptome of Salmonella enterica serovar Typhimurium 4/74 using strand-specific RNA-seq

| PRJNA257106 | ENA

Transcriptomic comparison of 4/74 and D23580 Salmonella enterica strains under infection-relevant conditions

Project description:RNA-sequencing of two Salmonella Enterica strains (4/74, D23580) under in vitro growth conditions (EEP, MEP, LEP, ESP, LSP, 25ºC, NaCl, bile shock, low Fe2+ shock, anaerobic shock, anaerobic growth, oxygen shock, NonSPI2, InSPI2, peroxide shock, and nitric oxide shock) and murine RAW264.7 macrophages.

2018-09-10 | GSE119724 | GEO

Salmonella enterica subsp. enterica serovar Typhimurium str. ST4/74

Project description:Salmonella Typhimurium: Immobilized growth vs. Planktonic growth

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Intra-macrophage Expression data of Francisella tularensis novicida U112

Project description:These samples are part of an experiment comparing the expression profiles of Francisella tularensis novicida grown in chemically defined medium and bacteria isolated 24 hours post infection of J774 macrophages to identify virulence factors Custom microarray submitted previously was used as the platform (GPL20119). The samples submitted here were compared with samples submitted previously (GSM1673555-57 in GSE68478) and differentially expressed genes during the intra-macrophage growth were identified.

2017-05-02 | E-GEOD-75689 | biostudies-arrayexpress

Fis occupancy along the Salmonella enterica serovar Typhimurium SL1344 fis::3XFlag strain grown in different aeration regimes.

Project description:The regulatory role of the Fis protein in fis and in the transcription of several gene regions during mid-exponential and late-stationary phase, and during different growth aeration regimes, has been investigated. Studies were done during those two growth phases and in aerated and non-aerated (microaerobic) conditions, to measure Fis enrichment and binding peaks in strategic gene regions by genome-wide microarray analysis ChIP-chip. This research investigation points to central roles for SPI-1, SPI-2, DNA gyrase and topoisomerase I, the elements of the stringent response, and the regulatory function of Fis-binding patterns, in setting and re-setting the activity of the fis gene and other involved promoters as a function of the growth conditions and aeration regimes experienced by Salmonella. One sample with four different treatments. Three biological replicates per sample. The Aerated 2 hour sample was set as the control condition for all samples.

2013-05-01 | E-GEOD-38661 | biostudies-arrayexpress

Transcriptional profile of Salmonella enterica serovar Typhimurium 4/74 wild-type and mutants using strand-specific RNA-seq

Project description:New tools for studying bacterial transcripts at the single nucleotide level offer an unparalleled opportunity to understand the bacterial transcriptome. For the model pathogen Salmonella enterica serovar Typhimurium, it is necessary to identify the regulatory inputs for all RNA transcripts, including small RNAs (sRNAs) and coding genes. Here, we use RNA-seq to define the transcriptomes of mutants lacking 18 global regulatory systems that, among other functions, modulate the expression of the SPI1 and SPI2 Type Three secretion systems in S. Typhimurium strain 4/74. We directly compared the roles of the major regulators of transcription, and reported the effects of the regulatory mutations on expression of sRNAs. We also use this method to describe the impact of the RNA chaperone Hfq upon the steady state levels of 280 sRNA transcripts.

2016-08-09 | GSE79314 | GEO

High-throughput gene expression profiling of Salmonella enterica serovar Paratyphi A in the blood of bacteremic patients in Bangladesh

Project description:In this work, we applied an RNA analysis method, Selective Capture of Transcribed Sequences (SCOTS), and cDNA hybridization-microarray technology to identify S. Paratyphi A transcripts expressed by bacteria in the blood of three patients in Bangladesh. In total, we detected 1798 S. Paratyphi A mRNAs expressed in the blood of infected humans (43.9% of the ORFeome). Of these, we identified 868 in at least two patients, and 315 in all three patients. S. Paratyphi A transcripts identified in at least two patients encode proteins involved in energy metabolism, nutrient and iron acquisition, vitamin biosynthesis, stress responses, oxidative stress resistance, and pathogenesis. A number of detected transcripts are expressed from PhoP and SlyA-regulated genes associated with intra-macrophage survival, genes contained within Salmonella Pathogenicity Islands (SPIs) 1-4, 6, 10, 13, and 16, as well as RpoS-regulated genes. The largest category of identified transcripts are those encoding proteins with unknown function. When comparing level of bacterial mRNA detection using in vivo samples collected from infected patients to samples from in vitro grown organisms, we found significant differences for 347, 391, and 456 S. Paratyphi A transcripts in each of three individual patients (approximately 9.7% of the ORFeome). Of these, expression of 194 transcripts (4.7% of ORFs) was concordant in two or more patients, and 41 in all patients. Genes encoding these transcripts are contained within SPI-1, 3, 6 and 10, are PhoP-regulated genes, are involved in energy metabolism, nutrient acquisition, drug resistance, or are uncharacterized genes. Using quantitative RT-PCR, we confirmed increased gene expression in vivo for a subset of genes identified in our analyses. We compared transcriptional profiles of S. Paratyphi A from the blood of infected humans to S. Paratyphi A grown in vitro. Replicates and dye-swaps were performed.

2010-09-06 | E-GEOD-22958 | biostudies-arrayexpress

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