Transcriptomic analysis of agr-deficient Staphylococcus aureus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA497884 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:We provide the transcriptomic profile of rsp deficient Staphylococcus aureus in order to elucidate the impact upon virulence.
2022-03-28 | GSE199593 | GEO
Project description:S. aureus response to agr operon and a SAUSA300_1984 deletion.
2019-03-14 | GSE121625 | GEO
Project description:Compilation fo whole genome gene expression changes in Staphylococcus aureus USA300 LAC cultures grown in the presence of vehicle or the anti-gout drug benzbromarone. The drug was intially screened as effective against the agr quorum sensing system in Staphylococcus aureus AH1677. A microarray study using total RNA harvested from three cultures of Staphylococcus aureus USA300 LAC plus vehicle control and three cultures of Staphylococcus aureus USA300 LAC plus 12 uM benzbromarone.
2014-03-19 | E-GEOD-55980 | biostudies-arrayexpress
Project description:Compilation fo whole genome gene expression changes in Staphylococcus aureus USA300 LAC cultures grown in the presence of vehicle or the anti-gout drug benzbromarone. The drug was intially screened as effective against the agr quorum sensing system in Staphylococcus aureus AH1677.
2014-03-19 | GSE55980 | GEO
Project description:Transcriptomic analysis of rsp deficient Staphylococcus aureus
| PRJNA820775 | ENA
Project description:More than 200 direct CodY target genes in Staphylococcus aureus were identified by genome-wide analysis of in vitro DNA binding. This analysis, which was confirmed for some genes by DNase I footprinting assays, revealed that CodY is a direct regulator of numerous transcription units associated with amino acid biosynthesis, transport of macromolecules and virulence. The virulence genes regulated by CodY fell into three groups. One group was dependent on the Agr system for its expression; these genes were indirectly regulated by CodY through its repression of the agr locus. A second group was regulated directly by CodY. The third group, which includes genes for alpha-toxin and capsule synthesis, was regulated by CodY in two ways, i.e., by direct repression and by repression of the agr locus. Since S. aureus CodY was activated in vitro by the branched chain amino acids and GTP, CodY appears to link changes in intracellular metabolite pools with the induction of numerous adaptive responses, including virulence. Affymetrix GeneChips were used to compare the transcript titers of S. aureus strains UAMS-1 (wild type) and corresponding agr- (strain CM18), codY- (strain MS1), and agr- codY- (strain CM19) isogenic mutant strains during exponential and stationary phase growth. At least two biological replicates were assessed for each strain and each growth phase.
2010-04-13 | E-GEOD-20973 | biostudies-arrayexpress
Project description:Therapy of Staphylococcus aureus bacteremia is often ineffective, even under optimal conditions, and adapted subclones with attenuated agr-mediated virulence activation are associated with persistent infection and mortality. To understand how apparent loss of virulence leads to increased mortality, we sequenced complete genomes from clone pairs from colonizing and infected sites of patients in whom S. aureus demonstrated a within-host downshift in agr function in the infecting isolate. Clone pairs with a downshift in agr function showed substantial genetic divergence compared to wild-type pairs from controls. Complementation studies further identified an agr-defective bacteremic strain that was highly virulent in vivo, which we linked to a mutation that restored expression of the agr-regulated ess/Type-VII secretion system; a known virulence factor. Our results suggest that selection pressure during invasive infection is strong enough to mutationally bypass agr-deficiency associated loss of virulence, and that efforts to suppress agr function may need to be reconsidered.
2019-08-14 | GSE102637 | GEO
Project description:The fungal metabolite apicidin acts as a quorum sensing inhibitor in Staphylococcus aureus. Here we use RNA-sequencing to examine the effect of apicidin on gene expression, comparing to untreated wild-type and an agr quorum sensing mutant.
2019-01-29 | GSE125741 | GEO
Project description:More than 200 direct CodY target genes in Staphylococcus aureus were identified by genome-wide analysis of in vitro DNA binding. This analysis, which was confirmed for some genes by DNase I footprinting assays, revealed that CodY is a direct regulator of numerous transcription units associated with amino acid biosynthesis, transport of macromolecules and virulence. The virulence genes regulated by CodY fell into three groups. One group was dependent on the Agr system for its expression; these genes were indirectly regulated by CodY through its repression of the agr locus. A second group was regulated directly by CodY. The third group, which includes genes for alpha-toxin and capsule synthesis, was regulated by CodY in two ways, i.e., by direct repression and by repression of the agr locus. Since S. aureus CodY was activated in vitro by the branched chain amino acids and GTP, CodY appears to link changes in intracellular metabolite pools with the induction of numerous adaptive responses, including virulence.
2010-04-01 | GSE20973 | GEO
Project description:RNAseq of exponentially growing cultures of the four agr prototype strains used in the study to investigate if differential expression of regulators interacting with the agr system could explain the differences in AIP sensitivity. Abstract Staphylococcus aureus both colonizes humans and causes severe virulent infections. Virulence is regulated by the agr quorum sensing system and its autoinducing peptide (AIP), with dynamics at the single-cell level across four agr-types – each defined by distinct AIP sequences and capable of cross-inhibition – remaining elusive. Employing microfluidics, time-lapse microscopy, and deep-learning image analysis, we uncovered significant differences in AIP sensitivity among agr-types. We observed bimodal agr activation, attributed to intergenerational phenotypic stability and influenced by AIP concentration. Upon AIP stimulation, agr III showed AIP insensitivity, while agr II exhibited increased sensitivity and prolonged generation time. Beyond expected cross-inhibition of agr I by heterologous AIP II and III, the presumably cross-activating AIP IV also inhibited agr I. Community interactions across different agr-type pairings revealed four main patterns: stable or switched dominance, and delayed or stable dual activation, influenced by community characteristics. These insights underscore the potential of personalized treatment strategies considering virulence and genetic diversity.
2024-03-05 | E-MTAB-13859 | biostudies-arrayexpress