Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Transcriptome comparison of the Streptococcus pneumoniae D39 ∆rgg144to D39 wild type grown in Mannose

ABSTRACT: Microbes communicate with each other by using quorum sensing (QS) systems and modulate their collective ‘behavior’ for in-host colonization and virulence, biofilm formation, and environmental adaptation. The recent increase in genome data availability reveals the presence of several putative QS sensing circuits in microbial pathogens, but many of these have not been functionally characterized yet, despite their possible utility as drug targets. To increase the repertoire of functionally characterized QS systems in bacteria, we studied Rgg144/Shp144 and Rgg939/Shp939, two putative QS systems in the important human pathogen Streptococcus pneumoniae. We find that both of these QS circuits are induced by short hydrophobic peptides (Shp) upon sensing sugars found in the respiratory tract, such as galactose and mannose. Microarray analyses using cultures grown on mannose and galactose revealed that the expression of a large number of genes is controlled by these QS systems, especially those encoding for essential physiological functions and virulence-related genes such as the capsular locus. Moreover, the array data revealed evidence for cross-talk between these systems. Finally, these Rgg systems play a key role in colonization and virulence, as deletion mutants of these QS systems are attenuated in the mouse models of colonization and pneumonia.

ORGANISM(S): Streptococcus pneumoniae D39

PROVIDER: GSE112284 | GEO | 2018/10/19

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Transcriptome comparison of the Streptococcus pneumoniae D39 ∆rgg144to D39 wild type grown in galactose

Project description:Microbes communicate with each other by using quorum sensing (QS) systems and modulate their collective ‘behavior’ for in-host colonization and virulence, biofilm formation, and environmental adaptation. The recent increase in genome data availability reveals the presence of several putative QS sensing circuits in microbial pathogens, but many of these have not been functionally characterized yet, despite their possible utility as drug targets. To increase the repertoire of functionally characterized QS systems in bacteria, we studied Rgg144/Shp144 and Rgg939/Shp939, two putative QS systems in the important human pathogen Streptococcus pneumoniae. We find that both of these QS circuits are induced by short hydrophobic peptides (Shp) upon sensing sugars found in the respiratory tract, such as galactose and mannose. Microarray analyses using cultures grown on mannose and galactose revealed that the expression of a large number of genes is controlled by these QS systems, especially those encoding for essential physiological functions and virulence-related genes such as the capsular locus. Moreover, the array data revealed evidence for cross-talk between these systems. Finally, these Rgg systems play a key role in colonization and virulence, as deletion mutants of these QS systems are attenuated in the mouse models of colonization and pneumonia.

2018-10-19 | GSE112283 | GEO

Transcriptome comparison of the Streptococcus pneumoniae D39 ∆rgg939 to D39 wild type grown in Mannose

2018-10-19 | GSE112286 | GEO

Transcriptome comparison of the Streptococcus pneumoniae D39 ∆rgg939 to D39 wild type grown in galactose

2018-10-19 | GSE112285 | GEO

Rgg-Shp regulators are important for pneumococcal colonization and invasion through their effect on mannose utilization and capsule synthesis

2018-10-19 | GSE112288 | GEO

ChIP-seq analyses of 10 quorum sensing regulators in Pseudomonas aeruginosa

Project description:The Pseudomonas aeruginosa quorum-sensing (QS) systems contribute to bacterial homeostasis and pathogenicity. Although many regulators have been characterized to control the production of virulence factors and QS signaling molecules, its detailed regulatory mechanisms still remain elusive. Here, we performed chromatin immunoprecipitation followed by high-throughput DNA sequencing (ChIP-seq) on 10 key QS regulators. The direct regulation of these genes by corresponding regulator has been confirmed by Electrophoretic mobility shift assays (EMSAs) and quantitative real-time polymerase chain reactions (qRT-PCR). Binding motifs are found by using MEME suite and verified by footprint assays in vitro. Collectively, this work provides new cues to better understand the detailed regulatory networks of QS systems. ChIP-seq of 10 QS regulators in Pseudomonas aeruginosa

2015-08-04 | E-GEOD-65356 | biostudies-arrayexpress

Lactonase Specificity is Key to Quorum Quenching in Pseudomonas aeruginosa

Project description:The human opportunistic pathogen Pseudomonas aeruginosa orchestrates the expression of many genes in a cell density-dependent manner by using a molecular communication system referred to as quorum sensing (QS). This bacterium uses an intricate network of regulators and QS molecules known as autoinducers. Among these autoinducers are two acyl-homoserine lactones (AHL) involved in QS circuits which modulate virulence factors production, biofilm formation, and antimicrobial sensitivity. Disrupting QS, a strategy referred to as quorum quenching (QQ), is a promising approach to modulate virulence while not directly challenging bacterial survival. For P. aeruginosa, QQ can be achieved using exogenous AHL-degrading lactonases. However, the importance of enzyme specificity on quenching efficacy has never been investigated. Here, we used two lactonases both targeting the signal molecules N-(3-oxododecanoyl)-L-Homoserine lactone (3-oxo-C12 HSL) and butyryl-homoserine lactone (C4 HSL) albeit with different efficacy on C4 HSL. Interestingly, both lactonases similarly decreased the concentrations of AHL and comparably impacted the expression of AHL-based circuits. Conversely, strong variations were observed in Pseudomonas Quinolone Signal (PQS) regulation. Both lactonases were then found to decrease virulence factors production and biofilm formation in vitro, albeit with different efficiencies. Unexpectedly, only the lactonase with substrate preference for 3-oxo-C12 HSL was able to inhibit P. aeruginosa pathogenicity in vivo in an amoeba infection model. Similarly, large variations between lactonases were observed in proteins involved in antibiotic resistance, biofilm formation, virulence and diverse cellular mechanisms. This global analysis provides the first evidence that QQ enzyme specificity is crucial to modulate QS-associated behavior in P. aeruginosa PA14.

2020-05-27 | PXD017421 | Pride

Convergent evolution of peptide-based quorum sensing required for virulence in a eukaryotic pathogen

Project description:Bacterial quorum sensing (QS) systems are characterized by the regulated biogenesis and sensing of specialized signaling molecules. Here, we describe a peptide, Qsp1, secreted by the fungal pathogen Cryptococcus neoformans. Mutants lacking Qsp1 are attenuated for infection, pulmonary accumulation, and growth within macrophages. Qsp1 promotes density-dependent cell wall integrity and resistance to extreme environments. Qsp1 is also required for a secreted aspartyl protease activity required for virulence. Further biochemical and large-scale genetic investigations reveal that cleavage of Qsp1 from the C-terminal of a pro-peptide requires a cell-associated serine protease and Qsp1 sensing requires a predicted oligopeptide importer. Strikingly, these features closely mirror the hallmarks of a peptide-based QS system found in gram-positive bacteria, despite no ancestral relationship between individual components. Our studies thus reveal a convergently evolved, peptide-based QS system required for the virulence of a fungal pathogen.

2016-06-08 | GSE73203 | GEO

ChIP-seq analyses of 10 quorum sensing regulators in Pseudomonas aeruginosa

2015-08-04 | GSE65356 | GEO

RNA seq of H2O, glucose, mannose or galactose-treated Batrachochytrium salamandrivorans zoospores

Project description:We report RNAseq data from B. salamandrivorans zoospores treated with different carbohydrates (glucose, mannose or galactose, 50 mM) or H2O as a control, for 1 hour. We found a selective upregulation of putative B. salamandrivorans virulence factors during initial contact with carbohydrates and galactose specifically.

2021-10-13 | GSE161129 | GEO

Investigating the role of Rgg1518 transcriptional regulator in Streptococcus pneumoniae biology

Project description:Rggs are a group of transcriptional regulators found commonly in multiple homologous in a given species of streptococci, and they play diverse roles in metabolism and virulence. Here we studied Rgg1518’s (SPD_1518) role in sugar metabolism, and in vivo survival and virulence of Streptococcus pneumoniae. In vitro analysis showed that Rgg1518 is highly induced by galactose and mannose, and its isogenic mutant is attenuated in growth on these sugars compared to the wild type. The regulon information obtained by microarray analysis showed that Rgg1518 has by far the largest regulon on galactose compared to the other Rggs and controls the expression of functionally diverse set of genes involved in galactose uptake and catabolism, capsule biosynthesis, protein translation as well as those involved in other metabolic functions. We showed that Rgg1518 is the repressor of capsule biosynthesis, and identified Rgg1518 binding motif in the regulatory region of capsule locus. We demonstrated an interregulatory interactions among Rggs. Furthermore, the rgg1518 mutant was found to be attenuated in colonization and virulence in a mouse model of colonisation and pneumonia.

2021-06-01 | GSE154887 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data