GEO DataSets

(Submitter supplied) Listeria monocytogenes SigB and PrfA are pleiotropic regulators of stress response and virulence gene expression, which have been shown to co-regulate genes in L. monocytogenes. We performed whole genome transcriptional profiling in the presence of PrfA* and active SigB, to identify the overlaps between the PrfA virulence regulon and the SigB stress response regulon. In L. monocytogenes, the PrfA* allele contributes to the activation of virulence genes to a level comparable to that of intracellular growing L. more...

Organism:

Listeria monocytogenes; Listeria innocua

Type:

Expression profiling by array

Platform:

GPL5029

24 Samples

Download data: GPR

(Submitter supplied) Listeria monocytogenes is well known to have the ability to survive and grow under a variety of stress conditions. The ability to survive and grow under osmotic stress conditions in particular appears to be important for both growth in certain foods and food associated environments as well as for host infection. To characterize the contributions of transcriptional regulators important for stress response and virulence (i.e., Sigma B - σB and PrfA), we initially analyzed three L. more...

Organism:

Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL4281

1 Sample

Download data: GPR

(Submitter supplied) To characterize regulons of alternative sigma factor SigH, SigL, and SigC in Listeria monocytogenes, in-frame mutant strains were created in the 10403S background. Regulons controlled by these 3 alternative sigma factors were characterized by whole-genome microarrays. The L. monocytogenes 10403S wild type and sigma factor null mutation strains were grown at 37 °C to stationary phase (defined in this study as growth to OD600 = 1.0, followed by incubation for an additional 3 h) prior to RNA isolation. more...

Organism:

Listeria monocytogenes; Listeria innocua

Type:

Expression profiling by array

Platform:

GPL5029

5 Samples

Download data: GPR, TXT

(Submitter supplied) The foodborne pathogen Listeria monocytogenes uses a number of transcriptional regulators, including the negative regulator CtsR, to control gene expression under different environmental conditions and in response to stress. Gene expression patterns of DctsR log phase cells were compared to both wt and ictsR-mcsA log phase cells grown with 0.5mM IPTG to identify CtsR-dependent genes.We identified 62 CtsR-dependent genes that showed significant expression ratios (adj. more...

Organism:

Listeria innocua; Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL5029

2 Samples

Download data: GPR

(Submitter supplied) The foodborne pathogen Listeria monocytogenes uses a number of transcriptional regulators, including the negative regulator HrcA, to control gene expression under different environmental conditions and in response to stress. Gene expression patterns of DhrcA stationary phase cells were compared to wt to identify hrcA-dependent genes. We identified 61 HrcA-dependent genes that showed significant expression ratios (adj. more...

Organism:

Listeria monocytogenes; Listeria innocua

Type:

Expression profiling by array

Platform:

GPL5029

1 Sample

Download data: GPR

(Submitter supplied) The extensively studied intracellular pathogen, L. monocytogenes, is an ideal model for identifying small-molecule agents for treating bacterial infections. By selecting specific biological targets in L. monocytogenes, which are common to Gram-positive pathogens, we could extrapolate drug discovery information derived from this well-studied bacterium. Attenuating the pathogen’s virulence and stress response attributes without killing it, eliminates selective pressure caused by disruption of essential gene functions (as done by current antibiotics) and reduces the likelihood of developing microbes that are impervious to the effects of antibiotics. more...

Organism:

Listeria monocytogenes; Listeria innocua; Listeria monocytogenes 10403S

Type:

Expression profiling by array

Platform:

GPL5029

1 Sample

Download data: GPR

(Submitter supplied) The Listeria monocytogenes genome contains more than 20 genes that encode cell surface-associated proteins termed internalins, which are characterized by the presence of multiple leucine-rich repeats. Subsets of internalin genes have been reported previously as transcriptionally regulated by the stress responsive sigma factor B (inlA, inlB, inlC2 and inlD) and the pleiotropic transcriptional activator PrfA (inlA, inlB, inlC). more...

Organism:

Listeria monocytogenes 10403S; Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL4604

4 Samples

Download data: GPR

(Submitter supplied) Purpose: The objective of the present study was to refine the PrfA regulatory network using RNA-seq to characterize the L. monocytogenes transcriptome in a wt, ∆prfA, and prfA* under PrfA-inducing conditions. Methods: Sequence reads were aligned to the L. monocytogenes 10403S genome using the BWA-MEM algorithm, version 0.7.3a. The data for coverage per base on the sense and antisense strands were analyzed separately using SAMtools. more...

Organism:

Listeria monocytogenes

Type:

Expression profiling by high throughput sequencing

Platform:

GPL26477

9 Samples

Download data: TXT

(Submitter supplied) Listeria monocytogenes strains classify into at least three distinct phylogenetic lineages. Correlations exist between lineage classification and source of bacterial isolation, e.g., human clinical and food isolates usually classify into either lineage I or II, however, human clinical isolates are over-represented in lineage I while food isolates are over-represented in lineage II. σB, a transcriptional regulator previously demonstrated to contribute to environmental stress response and virulence in L. more...

Organism:

Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL4281

4 Samples

Download data: GPR

(Submitter supplied) The alternative sigma factor sigmaB has an important role in the acquisition of stress-resistance in many gram-positive bacteria. In the foodborne pathogen Bacillus cereus sigmaB is activated strongly upon a heat shock and other stress conditions. Here we describe the identification of the set of sigmaB-regulated genes in B. cereus by DNA microarray analysis of the transcriptome upon a mild heat shock. more...

Organism:

Bacillus cereus ATCC 14579

Type:

Expression profiling by array

Platform:

GPL4406

7 Samples

Download data

(Submitter supplied) In several gram-positive bacterial genera including Bacillus, Staphylococcus, and Listeria, sigma B (σB) has been identified as a stress-responsive alternative sigma factor responsible for initiating transcription of genes (the σB regulon) involved in response to stress-inducing environmental conditions. In L. monocytogenes, a foodborne pathogen of considerable threat to public health and the food industry, σB is involved in regulation of stress response and virulence gene expression. more...

Organism:

Listeria monocytogenes; Listeria innocua

Type:

Expression profiling by array

Platform:

GPL5029

4 Samples

Download data: GPR

(Submitter supplied) PrfA activity was studied in L. monocytogenes strain EGD and in an isogenic prfA deletion mutant (EGDΔprfA) carrying multiple copies of the wild-type prfA or the mutant prfA* gene (strains EGDΔprfApPrfA and EGDΔprfApPrfA*) after growth in brain heart infusion (BHI), Luria-Bertani broth (LB) or a defined minimal medium (MM) supplemented either with one of the three PTS-carbohydrates, glucose, mannose and cellobiose, or the non-PTS carbon source glycerol. more...

Organism:

Listeria monocytogenes; Listeria monocytogenes EGD-e

Type:

Expression profiling by array

Platforms:

GPL7062 GPL6554

24 Samples

Download data: TXT

(Submitter supplied) Transcriptional profile after growth in MM (minimal medium (Premaratne et al. 2001) supplemented with 50 mM Glucose. Note: strain "EGD" has not been deposited at ATCC/NCTC. It is a derivative of the original Murray strain (Murray et al. 1926), obtained from S.H.E. Kaufmann. Strain "EGD-e" has been obtained from H. Hahn (Berlin) via T. Chakraborty (Gießen) and is deposited under ATTC BAA-679 and in the Pasteur culture collection. more...

Organism:

Listeria monocytogenes; Listeria monocytogenes EGD-e

Type:

Expression profiling by array

Platform:

GPL7062

3 Samples

Download data: TXT

(Submitter supplied) Transcriptional profile of prfA, the dependent genes and the PTS genes after growth in MM (minimal medium (Premaratne et al. 2001) supplemented with 50 mM glucose, cellobiose or glycerol. Keywords: prfA overexpressing strains

Organism:

Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL6554

12 Samples

Download data: TXT

(Submitter supplied) Transcriptional profile of prfA, the dependent genes and the PTS genes after growth in BHI (brain-heart-infusion), LB (Luria Bertani broth) and MM (minimal medium (Premaratne et al. 2001) (each supplemented with 50 mM Glucose). Keywords: media comparison

Organism:

Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL6554

9 Samples

Download data: TXT

(Submitter supplied) Analysis of L. monocytogenes ptsH, hprK and ccpA mutants defective in carbon catabolite repression (CCR) control revealed significant alterations in the expression of PrfA-dependent genes. The hprK mutant showed high up-regulation of PrfA-dependent virulence genes upon growth in glucose-containing media whereas expression of these genes was even slightly down-regulated in the ccpA mutant when compared to the wild-type strain. more...

Organism:

Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL4418

10 Samples

Download data

(Submitter supplied) High hydrostatic pressure processing (HPP) is currently being used as a treatment for certain foods to control the presence of food-borne pathogens, such as Listeria monocytogenes. Genomic microarray analysis was performed to determine the effects of HPP on L. monocytogenes in order to understand how it responds to mechanical stress injury. Reverse transcriptase PCR analysis of tufB and rpoC indicated that the reduction of mRNA expression in HPP treated cells was dependent on intensity and time of the treatment. more...

Organism:

Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL5334

9 Samples

Download data: GPR

(Submitter supplied) The aim of this study is to contribute to the understanding of L. monocytogenes virulence and survival capabilities using global gene expression profiling by means of DNA macroarrays. Keywords: strain comparison; correlation between expression and behaviour

Organism:

Listeria monocytogenes

Type:

Expression profiling by array

Platform:

GPL2811

24 Samples

Download data

(Submitter supplied) The stationary phase stress response transcriptome of the human bacterial pathogen Listeria monocytogenes was defined using RNA sequencing (RNA-Seq) with the Illumina Genome Analyzer. Specifically, bacterial transcriptomes were compared between stationary phase cells of L. monocytogenes 10403S and an otherwise isogenic DsigB mutant, which does not express the alternative sigma factor σB, a major regulator of genes contributing to stress response. more...

Organism:

Listeria monocytogenes

Type:

Expression profiling by high throughput sequencing

Platform:

GPL9363

4 Samples

Download data: TXT

(Submitter supplied) The foodborne pathogen Listeria monocytogenes (Lm) can cause invasive infection in susceptible animals and humans. To survive and proliferate within hosts, this facultative intracellular pathogen needs to tightly coordinate the expression of a complex regulatory network, including virulence factors. Here, we identify and characterize MouR a novel virulence regulator of Lm. Through RNA-seq transcriptomic analysis, we characterized the MouR regulatory network and demonstrated how MouR positively controls the expression of the Agr system (agrBDCA) of Lm. more...

Organism:

Listeria monocytogenes EGD-e

Type:

Expression profiling by high throughput sequencing

Platform:

GPL24263

6 Samples

Download data: TXT