GEO DataSets

(Submitter supplied) Methicillin-resistant Staphylococcus aureus (MRSA) is problematic both in hospitals and the community. Currently, we have limited understanding of mechanisms of innate immune evasion used by S. aureus. To that end, we created an isogenic deletion mutant in strain MW2 (USA400) of the saeR/S two-component gene regulatory system and studied its role in mouse models of pathogenesis and during human neutrophil interaction. more...

Organism:

Coxiella burnetii; Rickettsia rickettsii; Staphylococcus aureus; Chlamydia muridarum; Staphylococcus epidermidis RP62A; Chlamydia caviae GPIC; Staphylococcus haemolyticus JCSC1435; Borreliella burgdorferi B31; Coxiella burnetii RSA 493; Chlamydia trachomatis D/UW-3/CX; Chlamydia pneumoniae AR39; Staphylococcus epidermidis ATCC 12228; Staphylococcus aureus subsp. aureus MW2; Granulibacter bethesdensis

Type:

Expression profiling by array

Platform:

GPL4692

12 Samples

Download data: CEL, CHP

(Submitter supplied) The transcriptomes of Δrho mutant cells and of wild-type cells grown in RPMI medium with or without 40 or 80 µg/ml of BCM were analyzed using Agilent microarrays in order to analyze the effects of the Rho inhibitor bicyclomycin (BCM) treatment on antisense transcription and changes in the expression of protein coding genes. All antisense RNAs exhibiting higher levels in the rho mutant compared to the wild-type showed similar levels in BCM-treated wild-type cells (80 µg/ml BCM). more...

Organism:

Staphylococcus aureus subsp. aureus NCTC 8325; Staphylococcus aureus

Type:

Expression profiling by array

Platform:

GPL24872

12 Samples

Download data: TXT

(Submitter supplied) To measure S. aureus gene expression during growth phase and/or S. aureus–PMN interaction. Keywords: other

Organism:

Chlamydia trachomatis; Borreliella burgdorferi; Yersinia pestis; Coxiella burnetii; Staphylococcus aureus; Streptococcus pyogenes

Type:

Expression profiling by array

Platform:

GPL2129

159 Samples

Download data

(Submitter supplied) Staphylococcus aureus strain MW2 was exposed to the following neutrophil microbicides, hydrogen peroxide (H2O2), hypochlorous acid (HOCl) and azurophilic granule proteins. At the indicated time points, bacterial cultures were centrifuged and bacteria were lysed with RLT buffer (Qiagen) using a FastPrep system. Purification of MW2 RNA and subsequent preparation of labeled cDNA target was performed as described in Methods. more...

Organism:

Rickettsia rickettsii; Chlamydia muridarum; Staphylococcus epidermidis RP62A; Coxiella burnetii; Staphylococcus epidermidis ATCC 12228; Chlamydia trachomatis D/UW-3/CX; Staphylococcus aureus subsp. aureus MW2; Granulibacter bethesdensis; Staphylococcus aureus; Chlamydia pneumoniae AR39; Borreliella burgdorferi B31; Coxiella burnetii RSA 493; Chlamydia caviae GPIC; Staphylococcus haemolyticus JCSC1435

Type:

Expression profiling by array

Platform:

GPL4692

48 Samples

Download data: CEL

(Submitter supplied) Staphylococcus aureus is a leading cause of bloodstream infections worldwide. In the United States, many of these infections are caused by a strain known as USA300. Although progress has been made, our understanding of the S. aureus molecules that promote bacteremia and survival in human blood is incomplete. To that end, we analyzed the USA300 transcriptome during culture in human blood, human serum, and trypticase soy broth (TSB), a standard laboratory culture media. more...

Organism:

Staphylococcus aureus; Staphylococcus aureus subsp. aureus USA300

Type:

Expression profiling by array

Platform:

GPL8069

80 Samples

Download data: CEL, CHP

(Submitter supplied) Gene expression in human umbilical vein endothelial cells (HUVEC) was investigated by microarray analysis after 4 h infection with S. aureus isolated from healthy nasal carriers (n=5) and from blood (n=5) of septic patients. All bacterial isolates were spa-typed and characterized with a DNA microarray to determine the presence of virulence genes. Keywords: infection studies, pathogen, S. aureus

Organism:

Homo sapiens

Type:

Expression profiling by array

Dataset:

GDS4030

Platform:

GPL570

12 Samples

Download data: CEL

Analysis of human umbilical vein endothelial cells (HUVECs) infected with S. aureus from nares of healthy carriers or from blood of septic patients (i.e. representing a disseminated disease). Results provide insight into interactions between HUVECs and virulent/non-virulent S. aureus isolates.

Organism:

Homo sapiens

Type:

Expression profiling by array, count, 4 infection sets

Platform:

GPL570

Series:

GSE13736

12 Samples

Download data: CEL

(Submitter supplied) Methicillin resistant Staphylococcus aureus (MRSA) is an opportunistic pathogen chief amongst bloodstream infecting pathogens. MRSA produces an array of human specific virulence factors that may contribute to immune suppression. Here, we defined the response of primary human phagocytes to infection with MRSA using RNA-Seq. We found that the overall transcriptional response to MRSA was weak both in the number of genes and the magnitude of response. more...

Organism:

Homo sapiens

Type:

Expression profiling by high throughput sequencing

Platforms:

GPL20301 GPL24676

114 Samples

Download data: TXT

(Submitter supplied) S. aureus biofilms are associated with the organism's ability to cause disease. Biofilm associated bacteria must cope with the host's innate immune system. We used commercially available Affymetrix S. aureus GeneChips to compare the gene expression properties of 4 and 6 day established biofilms following short (1 hr)- and long (24 hr)- term exposure to macrophages and neutrophils.

Organism:

Staphylococcus aureus

Type:

Expression profiling by array

Platform:

GPL1339

35 Samples

Download data: CEL, CHP

(Submitter supplied) The Staphylococcus aureus two-component regulatory system, SrrAB, coordinates hypoxic responses during in vitro growth conditions. S. aureus Affymetrix GeneChips were used to compare S. aureus expression properties of wild type and isogenic ssrA mutant cells during aerobic growth conditions. S. aureus Affymetrix GeneChips were also used to compare the S. aureus expression properties of wild type and isogenic ssrA mutant cells during hypoxic growth conditions. more...

Organism:

Staphylococcus aureus

Type:

Expression profiling by array

Platform:

GPL1339

8 Samples

Download data: CEL, CHP

(Submitter supplied) The SaeRS two-component regulatory system of Staphylococcus aureus is known to affect the expression of many genes. The SaeS protein is the histidine kinase responsible for phosphorylation of the response regulator SaeR. In S. aureus Newman, the sae system is constitutively expressed due to a point mutation in saeS, relative to other S. aureus strains, which results in substitution of proline for leucine at amino acid 18. more...

Organism:

Staphylococcus aureus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL18481

10 Samples

Download data: TXT

(Submitter supplied) Background. Infections caused by Staphylococcus aureus are associated with significant morbidity and mortality and are an increasing threat not only in hospital settings. The expression of the staphylococcal virulence factor repertoire is known to be affected by the alternative sigma factor B (SigB). However, its impact during infection still is a matter of debate. Methods. Kidney tissue of controls or mice infected with S. more...

Organism:

Mus musculus

Type:

Expression profiling by array

Platform:

GPL6246

24 Samples

Download data: CEL

(Submitter supplied) Panton-valentine leukocidin (PVL) has been linked to worldwide emergence of community-associated methicillin resistant Staphylococcus aureus (CA-MRSA) -- its role in virulence in unclear. Here we show that PVL had no effect on global gene expression of prominent CA-MRSA strains nor did it affect bacterial clearance from lungs, spleen and kidneys in a highly discriminatory rabbit bacteremia model. These findings negate a large body of epidemiological research that implicated PVL in CA-MRSA virulence. more...

Organism:

Streptococcus pyogenes; Staphylococcus epidermidis ATCC 12228; Staphylococcus aureus subsp. aureus MW2; Borreliella burgdorferi; Yersinia pestis; Chlamydia pneumoniae AR39; Coxiella burnetii RSA 493; Granulibacter bethesdensis; Coxiella burnetii; Rickettsia rickettsii; Staphylococcus aureus; Chlamydia muridarum; Staphylococcus epidermidis RP62A; Chlamydia caviae GPIC; Chlamydia trachomatis; Borreliella burgdorferi B31; Chlamydia trachomatis D/UW-3/CX; Staphylococcus haemolyticus JCSC1435

Type:

Expression profiling by array

Platforms:

GPL2129 GPL4692

30 Samples

Download data: CEL, CHP

(Submitter supplied) Neutrophil lysis after phagocytosis is a process potentially important in the pathogenesis of community-associated methicillin-resistant S. aureus (CA-MRSA) infection. The mechanism for this process is not currently known. Therefore, to better understand CA-MRSA virulence we used human oligonucleotide microarrays to investigate the mechanism underlying enhanced PMN lysis that occurs after phagocytosis of CA-MRSA. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL570

113 Samples

Download data: CEL, CHP

(Submitter supplied) Staphylococcus aureus is a Gram-positive opportunistic pathogen, which is carried by approximately 30 % of the population at any time. In addition to being a commensal S. aureus can cause an array of infections, ranging from mild skin and soft tissue infections to life threatening endocarditis and septicemia. S. aureus encodes a variety of virulence factors that facilitate its pathogenic lifestyle. Genes encoding these virulence factors are under tight control by a complex regulatory network, which includes, sigma factors, sRNAs, and protein-based systems, such as Two-Component Systems (TCS). Previous work in our lab demonstrated that overexpression of the sRNA tsr37 leads to an increase in cellular aggregation in the absence of host serum. We determined that the clumping phenotype was dependent on a previously unannotated 88 amino acid protein encoded within the tsr37 sRNA transcript (which we named ScrA for S. aureus clumping regulator A). In addition to increased clumping, overexpression of ScrA also leads to increased biofilm formation. To investigate the mechanism of action of ScrA we performed mass spectrometry proteomics and RNA-sequencing in the ScrA overexpressing strain. A variety of virulence factors, including several surface adhesins were upregulated while several proteases were downregulated. Moreover, results showed a significant upregulation of the SaeRS two component system, suggesting that ScrA is influencing SaeRS activity. We go on to demonstrate that overexpression of ScrA in a saeR mutant abrogates the clumping/biofilm phenotypes confirming that ScrA functions via the Sae system. Finally, we identified the ArlRS TCS as a potential positive regulator of scrA expression. Collectively our results show that ScrA is an activator of the SaeRS system and suggests that ScrA may act as an intermediary between the ArlRS and SaeRS systems.

Organism:

Staphylococcus aureus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL18481

6 Samples

Download data: XLSX