Streptococcus agalactiae
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA111447 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:As part of a broader study to identify genes that contribute to fitness of the human pathobiont Streptococcus agalacitae (group B Streptococcus), we identified a GntR-class transcription factor, named mrvR, which contributes to bacterial persistence in human amniotic fluid and multipe virulence phenotypes. In order to understand the transcriptome of mrvR, whole-genome transcriptomic analysis was performed with wild type group B Streptococcus and an mrvR deletion mutant at three growth phases.
2021-02-03 | GSE165992 | GEO
Project description:Adaptation of group A Streptococcus to human amniotic fluid
| PRJNA120145 | ENA
Project description:We have discovered that GBS significantly remodels its transcriptome in response to exposure to human amniotic fluid. A large number of the affected genes are of unknown function, which means that much remains to be learned about the full influence of amniotic fluid on GBS. The majority of the observed changes in transcripts affects genes involved in basic bacterial metabolism and is connected to AF composition and nutritional requirements of the bacterium. The observation that many genes encoding adhesions are down-regulated, and genes encoding known virulence factors such as a hemolysin and a potent IL-8 proteinase are up-regulated likely have consequences for the outcome of host-pathogen interactions. Streptococcus agalactiae, serotype III strain NEM316 was grown in human amniotic fluid. Samples of bacteria were collected in mid log, late log and stationary growth phases and were used for RNA isolation for microarray analysis
2010-05-18 | E-GEOD-14456 | biostudies-arrayexpress
Project description:The human-derived serotype Ⅴ ST1 GBS strains NNA038 and NNA048 was isolated from a amniotic fluid of full-term pregnant woman who suffered from premature rupture of membrane in China.Serotype Ia ST7 GBS strain YM001 is an attenuated strain ,its parent strain HN016 was isolated from an outbreak epidemical disease in tilapia from China.HN016_KO_D2 is a knockout strain from Serotype Ia ST7 GBS strain HN016.
2019-11-12 | PXD011206 | Pride
Project description:Transcriptome analysis of Streptococcus agalactiae (group B Streptococcus) grown under control conditions or coincubated with serine hydroxamate to induce the bacterial stringent response
2017-11-14 | GSE98398 | GEO
Project description:Streptococcus agalactiae (Lancefield’s group B Streptococcus, GBS) is a major bacterial species of genus Streptococcus and has medical and veterinary importance by affecting mainly humans (Maione et al., 2005; Johri et al., 2006), cattle (Keefe, 1997) and fish (Mian et al., 2009). The GBS is the most important pathogen for the Nile tilapia, a global commodity of the aquaculture sector, causing outbreaks of septicemia and meningoencephalitis (Hernández et al., 2009; Mian et al., 2009). This study aimed to evaluate the global abundancy of proteins among the main genotypes of GBS isolated from fish identified in Brazil using a label free shotgun liquid chromatography-ultra definition mass spectrometry (LC-UDMSE) approach and to compare the differential expression of proteins identified between isolates from fish and human.
2019-01-14 | PXD008744 | Pride
Project description:Streptococcus agalactiae (Lancefield’s group B Streptococcus, GBS) is a major bacterial species of genus Streptococcus and has medical and veterinary importance by affecting mainly humans (Maione et al., 2005; Johri et al., 2006), cattle (Keefe, 1997) and fish (Mian et al., 2009). The GBS is the most important pathogen for the Nile tilapia, a global commodity of the aquaculture sector, causing outbreaks of septicemia and meningoencephalitis (Hernández et al., 2009; Mian et al., 2009).
2018-11-23 | PXD009330 | Pride
Project description:Regulation of gene expression in response to variable and often adverse environmental conditions is an essential component of microbial pathogenesis. We identified the two-component regulatory system CiaRH in a screen for genes essential for the survival of Streptococcus agalactiae (Group B Streptococcus, GBS) on exposure to in vitro models of environmental stress. We constructed site-directed, non-polar deletion mutations in the regulator gene ciaR and compared the growth of CiaR mutant GBS to wild-type GBS under stressed conditions. CiaR mutant GBS are more sensitive than wild-type GBS to elevated temperature, low pH, chemical mutagens and ultraviolet light; the mutants are also more sensitive to cell-wall active antibiotics and antimicrobial peptides. CiaR mutant strains are markedly attenuated in a mouse model of GBS sepsis. To determine the genes regulated by CiaR that account for these defects, transcriptional profiling was performed using DNA microarray analysis, comparing wild-type GBS to CiaR mutant GBS under non-stressed conditions.
2012-11-18 | GSE14569 | GEO
Project description:Streptococcus agalactiae, also known as Group B streptococcus, emerged in the 1960s as a leading cause of septicemia and meningitis in neonates. It is also an increasing cause of infections in adults with underlying diseases. To characterize regulatory elements in this species we performed a genome-wide transcription start site (TSS) profiling and whole-transcript sequencing. TSS were identified by using a differential RNA-seq strategy, based on selective Tobacco Acid Pyrophosphatase (TAP) treatment and adapter ligation, which differentiates primary transcripts and processed RNAs. The accuracy and sensitivity of TSS identification were increased by combining differential RNA-seq analyses under eight conditions corresponding to variations in growth conditions and genetic backgrounds. Whole-transcript sequencing used a two-step adaptor ligation-based directional RNA-seq protocol and was performed under two experimental conditions with triplicate experiments to assess variations in gene expression in response to an acid stress
2015-04-21 | E-MTAB-3200 | biostudies-arrayexpress
Project description:In the transition from recto-vaginal colonizing organism to invasive pathogen, Streptococcus agalactiae (Group B Streptococcus, GBS) must adapt to changes in host temperature, including elevated temperatures due to host fever. To identify genes important to the survival of GBS in response to heat stress, transcriptional profiling was performed using DNA microarray analysis, comparing GBS grown at normal temperature (37˚C) to GBS exposed to elevated temperature (42˚C).
2012-11-18 | GSE14573 | GEO