Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Genome-wide mapping of H4Ac in Legionella pneumophila-infected human macrophages

ABSTRACT: In this study we infected human blood-derived macrophages with L. pneumophila and used immunoprecipitation followed by sequencing (ChIP-Seq) to screen gene promoters for the activating histone 4 acetylation mark. We found about 500 genes with induced acetylation upon infection, including several pro-inflamatory and inflamatory factors and non-coding RNAs. In particular, we assess the functional consequences of tumor necrosis factor alpha-induced protein 2 (TNFAIP2), a factor not yet characterized in the pathology of L.pneumophila, on bacterial replication.

ORGANISM(S): Homo sapiens

PROVIDER: GSE79390 | GEO | 2016/04/18

SECONDARY ACCESSION(S): PRJNA315682

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Genome-wide transcriptional profiling of Legionella Pneumophila-infected A549 cells transfected with siRNA against TNFAIP2

Project description:In this study we transfected A549 cells with siRNA against TNFAIP2, infected them with L. pneumophila and performed transcriptional profiling. We found enrichment of genes in pro-inflammatory pathways by Pathway Over-respresentation analysis upon infection. There was no significant change in gene expression that we could attribute specifically to the knockdown of TNFAIP2.

2016-04-13 | GSE80214 | GEO

Genome-wide transcriptional profiling of Legionella Pneumophila-infected A549 cells transfected with siRNA against TNFAIP2

2016-04-13 | E-GEOD-80214 | biostudies-arrayexpress

Symbiont-mediated defense against Legionella pneumophila in amoebae

Project description:Legionella pneumophila are important opportunistic pathogens for which environmental reservoirs such as protists are crucial for the infection of humans. Free-living amoebae are considered key hosts providing nutrients and shelter for highly efficient intracellular proliferation of L. pneumophila, which eventually leads to lysis of the amoeba host cell. Yet, the significance of other bacterial players for L. pneumophila ecology is poorly understood. In this study we used a ubiquitous amoeba and their bacterial endosymbiont to investigate the impact of this common association on L. pneumophila infection. We demonstrate that Acanthamoeba castellanii harboring the chlamydial symbiont Protochlamydia amoebophila were able to erase L. pneumophila and, in contrast to symbiont-free amoebae, survived the infection and were able to resume growth. Environmental amoeba isolates harboring P. amoebophila were equally well-protected, and fresh environmental isolates of L. pneumophila were equally well-erased, suggesting ecological relevance of this symbiont-mediated protection. We further show that protection was not mediated by impaired L. pneumophila uptake. Instead, we observed reduced virulence of L. pneumophila released from symbiont-containing amoebae that is strongly supported by transcriptome data. Interference with transition to the transmissive phase is thus likely the basis for this protection. Finally, our data indicate that the defensive response of amoebae harboring P. amoebophila leaves the amoebae with superior fitness reminiscent of immunological memory. Given that mutualistic associations between bacteria and amoebae are widely distributed, P. amoebophila and potentially other amoeba endosymbionts could be key elements in shaping environmental survival, abundance and virulence of this important pathogen thereby affecting frequency of human infection.

2019-04-14 | GSE125876 | GEO

Legionella pneumophila transcriptomic response to CuO nanoparticles

Project description:Legionella pneumophila was exposed for 3h to 160 ug/ml of CuO nanoparticle. Untreated samples are used as the control condition.

2013-03-04 | GSE41966 | GEO

Transcriptome of Legionella pneumophila rpoS mutant in water

Project description:Legionella pneumophila is a water-borne pathogen, and thus survival in the aquatic environment is central to its transmission to humans. Hence, identifying genes required for its survival in water could help prevent Legionnaires’ disease outbreaks. In the present study, we investigate for the first time the role of the sigma factor RpoS in promoting the survival in water, where L. pneumophila experiences total nutrient deprivation. The rpoS mutant showed a significant survival defect compared to the wild-type strain in defined water medium (DFM). Then, we analyzed the transcriptome of the rpoS mutant during exposure to water using whole genome microarray analysis. We found that RpoS negatively affects the expression of several genes, including genes required for replication, cell division, translation and transcription, suggesting that the mutant fails to shutdown major metabolic programs.

2014-12-04 | GSE56258 | GEO

Legionella pneumophila subsp. pneumophila

Project description:Legionella pneumophila subsp. pneumophila

| PRJNA908725 | ENA

Detection of predicted small RNA of Legionella pneumophila

Project description:Legionella pneumophila is a gram-negative opportunistic human pathogen that infects and multiplies in a broad range of phagocytic protozoan and mammalian phagocytes. Based on the observation that small regulatory RNAs (sRNAs) play an important role in controlling virulence-related genes in several pathogenic bacteria, we attempted to test the hypothesis that sRNAs play a similar role in L. pneumophila. We used computational prediction followed by experimental verification to identify and characterize sRNAs encoded in the L. pneumophila genome. A 50-mer probe microarray was constructed to test the expression of predicted sRNAs in bacteria grown under a variety of conditions. This strategy successfully identified 22 expressed RNAs, out of which six were confirmed by northern blot and RACE. One of the identified sRNAs is highly expressed when the bacteria enter post exponential phase and computational prediction of its secondary structure reveals a striking similarity to the structure of 6S RNA, a widely distributed prokaryotic sRNA, known to regulate the activity of σ70-containing RNAP. A 70-mer probe microarray was used to identify genes affected by L. pneumophila 6S RNA in stationary phase. The 6S RNA encoded by the ssrS gene positively regulates expression of genes encoding type IVB secretion system effectors, stress response genes such as groES and recA as well as many genes with unknown or hypothetical functions. Deletion of 6S RNA significantly reduced L. pneumophila intracellular multiplication in both protist and mammalian host cells, but had no detectable effect on growth in rich media.

2010-01-01 | GSE19196 | GEO

Legionella pneumophila

Project description:Legionella pneumophila

| PRJNA526503 | ENA

Legionella pneumophila proteome

Project description:Legionella pneumophila cells were harvested during exponential growth (RP) and stationary growth (TP). VBNC cells were also anylzed. Protein subfractions were studied.

2015-11-13 | PXD001926 | Pride

Legionella pneumophila subsp. pneumophila

Project description:Legionella pneumophila subsp. pneumophila Serogroup 1

| PRJNA894168 | ENA