Staphylococcus aureus delays wound repair by harnessing the agr quorum sensing system to target keratinocyte lipid metabolism [scRNA-seq]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE273932 | GEO | 2025/08/02
REPOSITORIES: GEO
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Project description:NHEKs wounded by scratch and incubated with CM for 24 hours were evaluated by bulk RNAseq. Principal component analysis of these data revealed wounded NHEKs exposed to S. hominis products clustered close to control keratinocytes, suggesting these groups have similar transcriptomes, while the presence of S. aureus products caused variation shift in the transcriptome to result in a distinct cluster away from control. This was supported by a heatmap of differential gene expression of S. aureus and S. hominis CM treatment showing broad S. aureus-mediated suppression of genes induced by S. hominis. Conversely, upregulation of many genes by S. aureus were downregulated by S. hominis.
2025-08-02 | GSE273933 | 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
Project description:The agr quorum-sensing system clearly links Staphylococcus aureus metabolism to virulence, but little is known about how agr alters metabolism to affect cell survival during severe stress. Recently, we reported that agr activity increases survival of bacteria during treatment with lethal concentrations of H2O2, a crucial host defense against S. aureus. Here we report that protection by agr extends to growth resumption during the exit from stationary phase. The data indicate that the agr functionality of a cell’s ancestor affects stress-resiliency after resuming growth. Protection against killing by H2O2 depended on the agr effector molecule RNAIII and Rot, a transcription factor targeted by RNAIII. Expression data revealed that Δagr strains shift to fermentation, suggesting that agr promotes aerobic respiration. Epistasis between mutation of agr and sortase, which anchors surface proteins to the cell wall, suggested that reduced killing by H2O2 of wild-type agr strains acts through down-regulation of surface proteins that perturb respiration. Respiration generates reactive oxygen species (ROS), moderate amounts of which can protect from subsequent challenge by lethal concentrations, explaining agr-mediated protection against subsequent lethal H2O2 doses. Increased survival of wild-type agr cells in response to H2O2 required sodA, which dismutates O2- to H2O2, suggesting that sodA helps induce the low, protective levels of ROS triggered by agr. Additionally, detrimental effects of the Δagr mutation require ahpC, which functions to decrease the intracellular level of H2O2. Deletion of ahpC or sortase attenuated neutrophil-mediated killing of Δagr strains, demonstrating the importance of priming in anticipation of impending immune attack.
2023-06-20 | GSE206916 | GEO
Project description:The agr quorum-sensing system clearly links Staphylococcus aureus metabolism to virulence, but little is known about how agr alters metabolism to affect cell survival during severe stress. Recently, we reported that agr activity increases survival of bacteria during treatment with lethal concentrations of H2O2, a crucial host defense against S. aureus. Here we report that protection by agr extends to growth resumption during the exit from stationary phase. The data indicate that the agr functionality of a cell’s ancestor affects stress-resiliency after resuming growth. Protection against killing by H2O2 depended on the agr effector molecule RNAIII and Rot, a transcription factor targeted by RNAIII. Expression data revealed that Δagr strains shift to fermentation, suggesting that agr promotes aerobic respiration. Epistasis between mutation of agr and sortase, which anchors surface proteins to the cell wall, suggested that reduced killing by H2O2 of wild-type agr strains acts through down-regulation of surface proteins that perturb respiration. Respiration generates reactive oxygen species (ROS), moderate amounts of which can protect from subsequent challenge by lethal concentrations, explaining agr-mediated protection against subsequent lethal H2O2 doses. Increased survival of wild-type agr cells in response to H2O2 required sodA, which dismutates O2- to H2O2, suggesting that sodA helps induce the low, protective levels of ROS triggered by agr. Additionally, detrimental effects of the Δagr mutation require ahpC, which functions to decrease the intracellular level of H2O2. Deletion of ahpC or sortase attenuated neutrophil-mediated killing of Δagr strains, demonstrating the importance of priming in anticipation of impending immune attack.
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Project description:We performed spatial transcriptomics to characterize wound tissue response to commensal and pathogenic staphylococcus strains. Our analysis has revealed unique epithelial responses to each strain.
2025-08-02 | GSE273931 | GEO
Project description:The Staphylococcus aureus accessory gene regulator (agr) is a prototype quorum-sensing system in Gram-positive bacteria and a paradigmatic example of gene regulation by a small regulatory RNA, RNAIII. Using genome-wide transcriptional profiling in the community-associated methicillin-resistant (CA-MRSA) strain MW2, we demonstrate here that in contrast to the current model of target gene regulation by agr, a large subset of agr-regulated genes is controlled independently of RNAIII. This group comprised predominantly metabolism genes, whereas virulence factors were mostly controlled by RNAIII. Remarkably, the phenol-soluble modulin (PSM) leukocidin genes were the only virulence determinants under RNAIII-independent control, emphasizing their exceptional role in S. aureus physiology and pathogenesis. Of note, PSM promoters bound the AgrA response regulator protein, previously believed to interact exclusively with agr promoters, explaining the exceptionally strict control of PSMs by agr. Our results suggest that virulence factor control is a secondary acquisition of the agr regulon, which evolved by development of RNAIII around the mRNA of the PSM d-toxin, exemplifying how gene control via a small regulatory RNA may be linked to a pre-established regulatory circuit. In addition to elucidating agr control in CA-MRSA, which revealed features potentially crucial for CA-MRSA pathogenesis, our study establishes a novel two-level model of cell-density dependent gene regulation in S. aureus and gives important insight into the connection of metabolism and virulence control in this leading opportunistic pathogen. Keywords: Wild type control vs mutant Wild type in triplicate is compared to mutant in triplicate totalling 27 samples
2010-05-14 | E-GEOD-10165 | biostudies-arrayexpress
Project description:The Staphylococcus aureus accessory gene regulator (agr) is a prototype quorum-sensing system in Gram-positive bacteria and a paradigmatic example of gene regulation by a small regulatory RNA, RNAIII. Using genome-wide transcriptional profiling in the community-associated methicillin-resistant (CA-MRSA) strain MW2, we demonstrate here that in contrast to the current model of target gene regulation by agr, a large subset of agr-regulated genes is controlled independently of RNAIII. This group comprised predominantly metabolism genes, whereas virulence factors were mostly controlled by RNAIII. Remarkably, the phenol-soluble modulin (PSM) leukocidin genes were the only virulence determinants under RNAIII-independent control, emphasizing their exceptional role in S. aureus physiology and pathogenesis. Of note, PSM promoters bound the AgrA response regulator protein, previously believed to interact exclusively with agr promoters, explaining the exceptionally strict control of PSMs by agr. Our results suggest that virulence factor control is a secondary acquisition of the agr regulon, which evolved by development of RNAIII around the mRNA of the PSM d-toxin, exemplifying how gene control via a small regulatory RNA may be linked to a pre-established regulatory circuit. In addition to elucidating agr control in CA-MRSA, which revealed features potentially crucial for CA-MRSA pathogenesis, our study establishes a novel two-level model of cell-density dependent gene regulation in S. aureus and gives important insight into the connection of metabolism and virulence control in this leading opportunistic pathogen. Keywords: Wild type control vs mutant
2009-01-05 | GSE10165 | GEO
Project description:Staphylococcus aureus delays wound repair by harnessing the agr quorum sensing system to target keratinocyte lipid metabolism [scRNA-seq]
| PRJNA1144119 | ENA
Project description:Staphylococcus aureus delays wound repair by harnessing the agr quorum sensing system to target keratinocyte lipid metabolism [Spatial Transcriptomics]
| PRJNA1144120 | ENA
Project description:Staphylococcus aureus delays wound repair by harnessing the agr quorum sensing system to target keratinocyte lipid metabolism [bulkRNA-seq]
| PRJNA1144122 | ENA