Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1226566 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR32426870_1.fastq.gz | Fastqsanger.gz | |||
| SRR32426871_1.fastq.gz | Fastqsanger.gz | |||
| SRR32426872_1.fastq.gz | Fastqsanger.gz | |||
| SRR32426873_1.fastq.gz | Fastqsanger.gz | |||
| SRR32426874_1.fastq.gz | Fastqsanger.gz |
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Project description:Pathogenic Leptospira spp. are the causative agents of the zoonotic disease leptospirosis. During infection, Leptospira are confronted with deadly reactive oxygen species (ROS). Withstanding ROS produced by the host innate immunity is an important strategy evolved by pathogenic Leptospira for persisting in and colonizing hosts. The peroxide stress regulator, PerRA, represses genes involved in ROS defenses in L. interrogans. We have identified an ORF encoding a putative second PerR in pathogenic Leptospira that we named PerRB. We have determined the transcriptomic profil of a single perRB and a double perRAperRB mutants. The concomitant inactivation of perRA and perRB has a pleiotropic effect on the transcriptomic profil of L. interrogans. The lack of both PerRA and PerRB regulators led to the differential expression of several virulence-associated genes and a loss of virulence. Our findings provide new insights into a new regulatory network that controls virulence and host colonization.
2021-10-07 | GSE158051 | GEO
Project description:Pathogenic Leptospira spp. are the causative agents of the zoonotic disease leptospirosis. During infection, Leptospira are confronted with deadly reactive oxygen species (ROS). Withstanding ROS produced by the host innate immunity is an important strategy evolved by pathogenic Leptospira for persisting in and colonizing hosts. The peroxide stress regulator, PerR, represses genes involved in ROS defenses in L. interrogans. We have performed RNA sequencing in WT and perR mutant strains to characterize the L. interrogans adaptive response to hydrogen peroxide. We showed that Leptospira solicit three main peroxidase machineries (catalase, cytochrome C peroxidase and peroxiredoxin) and heme to adapt to peroxide stress as well as canonical chaperones of the heat shock response, and DNA repair. Determining the PerR regulon allowed to identify the PerR-dependent mechanisms of the peroxide adaptive response and has revealed a regulatory network involving other transcriptional regulators, two-component systems and sigma factors as well as non-coding RNAs that putatively orchestrate, in concert with PerR, this adaptive response. Our findings provide comprehensive insight into the mechanisms required by pathogenic Leptospira to overcome infection-related oxidants. This will participate in framing future hypothesis-driven studies to identify and decipher novel virulence mechanisms.
2020-09-22 | GSE140019 | GEO
Project description:In this report, we have developed a rapid oligonucleotide microarray detection technique to identify the most common ten Legionella spp.. The sensitivity of the detection was at 1.0 ng with genomic DNA or 13 CFU/100 mL with Legionella cultures. The microarray detected seven air conditioner-condensed water samples with 100% accuracy, validating the technique as a promising method for applications in basic microbiology, clinical diagnosis, food safety, and epidemiological surveillance. The phylogenetic study based on the ITS has also revealed interestingly that the non-pathogenic L. fairfieldensis is the closest to L. pneumophila than the nine other pathogenic Legionella spp..
2014-10-04 | GSE61962 | GEO
Project description:The overall goal of these experiments was to determine how human endothelial cells respond to pathogenic Leptospira interrogans. Leptospira interrogans causes leptospirosis, the most widespread zoonotic infection in the world. A hallmark of leptospirosis is widespread endothelial damage, which in severe cases leads to hemorrhage. In these experiments, we infected two endothelial cell lines with pathogenic Leptospira interrogans serovar Canicola strain Ca12-005, and as controls, with the non-pathogenic Leptospira biflexa serovar Patoc strain Pfra. As additional controls, uninfected cells were also included in the analyses.
2010-07-27 | GSE23173 | GEO
Project description:The overall goal of these experiments was to determine how human endothelial cells respond to pathogenic Leptospira interrogans. Leptospira interrogans causes leptospirosis, the most widespread zoonotic infection in the world. A hallmark of leptospirosis is widespread endothelial damage, which in severe cases leads to hemorrhage. In these experiments, we infected two endothelial cell lines with pathogenic Leptospira interrogans serovar Canicola strain Ca12-005, and as controls, with the non-pathogenic Leptospira biflexa serovar Patoc strain Pfra. As additional controls, uninfected cells were also included in the analyses.
2010-07-27 | GSE23172 | GEO
Project description:Leptospirosis is a globally important infectious disease caused by an infection with pathogenic Leptospira spp. and associated with kidney injury due to sustained tubulointerstitial inflammation. We apply the high-throughput Illumina sequencing platforms to determine the murine renal transcriptome and investigate gene expression alterations and biological pathways associated with kidney damage induced by leptospiral infection. The goal of this study is to investigate a global analysis of renal gene expression associated with renal damage that was induced by leptospiral infection in experimental mice models.
2022-07-25 | GSE185382 | GEO
Project description:Leptospira are emerging zoonotic pathogens transmitted from animals to humans typically through contaminated environmental sources of water and soil. Transcriptional regulation of pathogenic Leptospira spp. underlying the adaptive response to different hosts and environmental conditions remains elusive. In this study, we provide the first global Transcriptional Start Site (TSS) map of a Leptospira species. RNA was obtained from the pathogen Leptospira interrogans grown at 30° (optimal in vitro temperature) and 37°C (host temperature) and selectively enriched for 5' ends of native transcripts. Primary TSS (pTSS) was identified for 2,865 genes, accounting for 67% of the total genome. The majority of the TSSs were located between 0 to 10 nucleotides from the translational start site. Comparative dRNA-seq analysis revealed conservation of most pTSS at 30° and 37°C. Promoter prediction algorithms allow the identification of the binding sites of the alternative sigma factor sigma 54. However, other motifs were not identified indicating that Leptospira consensus promoter sequences are inherently different from the E. coli model. RNA sequencing also identified 277 and 226 putative small regulatory RNAs (sRNAs) at 30°C and 37°C, respectively, including 8 validated sRNAs by Northern blots. These results provide the first global view of transcriptional start sites and the repertoire of sRNAs in L. interrogans, and will establish a foundation for future experimental work on gene regulation under various environmental conditions including those in the host.
2017-01-23 | GSE92976 | GEO
Project description:Leptospirosis is a re-emerging tropical infectious disease caused by the pathogenic Leptospira spp. The different host innate immune responses were partially related to the different severity of leptospirosis. In this study, we employed transcriptomics and cytokine array to comparatively calculate the responses of murine peritoneal macrophages (MPM) and human peripheral blood monocytes (HBM) to leptospiral infection, and uncover a series of different expression regulations of these two immune cells. The regulation percentages in several biological processes of MPM, such as the antigen process and presentation, the regulation of membrane potential, and the innate immune response, etc., were much greater than those of HBM (>2 folds). In HBM and MPM, the CASP8 and FADD-like apoptosis regulator genes were significantly up-regulated, which supported previous results that the caspase-8/3 pathway plays an important role in macrophage apoptosis during leptospiral infection. The key component of complement pathway, C3, was only up-regulated in MPM. Several cytokines (e.g. IL-10, TNF-alpha) were differently expressed at both mRNA and protein level in MPM and HBM. The differences in the transcriptomics and the cytokine expression revealed in this study were partially consistent with the different outcomes of the chronic and acute leptospirosis; thus, these findings facilitated further molecular study on the innate immune response to leptospiral infection. Murine peritoneal macrophages (MPM) and human peripheral blood monocytes (HBM) were infected by pathogenic Leptospira. The host cells were collected at 1h, 2h, and 4h after infection. The uninfected macrophage sample was designed as a negative control. Three biological replicates were designed for each sample type. There were totally 24 hybridizations (12 for MPM, and 12 for HBM) included in this submission.
2013-03-15 | E-GEOD-45170 | biostudies-arrayexpress