L.reuteri.YLR001
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ABSTRACT:
PROVIDER: PRJNA682320 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Complete genome sequence of probiotic Lactobacillus reuteri ZLR003 isolated from healthy weaned pig
| PRJNA312751 | ENA
Project description:Inflammatory diseases of the gut are associated with increased intestinal oxygen concentrations and high levels of inflammatory oxidants, including hydrogen peroxide (H2O2) and hypochlorous acid (HOCl), which are antimicrobial compounds produced by the innate immune system. This contributes to dysbiotic changes in the gut microbiome, including increased populations of pro-inflammatory enterobacteria (Escherichia coli and related species) and decreased levels of health-associated anaerobic Firmicutes and Bacteroidetes. The pathways for H2O2 and HOCl resistance in E. coli have been well-studied, but little is known about how commensal and probiotic bacteria respond to inflammatory oxidants. In this work, we have characterized the transcriptomic response of the anti-inflammatory, gut colonizing Gram-positive probiotic Lactobacillus reuteri to both H2O2 and HOCl. L. reuteri mounts distinct responses to each of these stressors, and both gene expression and survival were strongly affected by the presence or absence of oxygen. Oxidative stress response in L. reuteri required several factors not found in enterobacteria, including the small heat shock protein Lo18, polyphosphate kinase 2, and RsiR, an L. reuteri-specific regulator of anti-inflammatory mechanisms. These results raise the intriguing possibility of developing treatments for inflammatory gut diseases that could sensitize pro-inflammatory enterobacteria to killing by the immune system while sparing anti-inflammatory, health-associated species.
2019-08-15 | GSE127961 | GEO
Project description:Lactobacillus reuteri 100-23 is an autochthonous inhabitant of the rodent gastrointestinal system that adheres to the non-secretory epithelium of the forestomach and forms biofilms. Microarray analysis of the expression profile of L. reuteri 100-23 cells harvested from the stomach of ex-Lactobacillus-free mice, compared to those of L. reuteri 100-23 in laboratory culture, revealed an in vivo upregulation of a urease gene cluster by greater than 50-fold. Genes for urease production were absent in all publically available Lactobacillus genome sequences except L. reuteri 100-23 and have recently been identified as specific to rodent strains of L. reuteri (Frese et al. 2011). In the current study, the urease enzyme was shown to be functional. Supplementation with 2% urea allowed L. reuteri 100-23 to increase the pH of the culture medium. A mutant strain of L. reuteri 100-23 was developed by insertional inactivation of the ureC gene, which encodes the largest subunit of the urease enzyme. The mutant strain was unable to hydrolyze urea to increase the pH of culture medium, and did not survive acid stress at pH 2.5 for 6 h, even in the presence of urea. In contrast, the wild type strain was still viable after 6 h when 2% urea supplementation was included. When mice free of lactobacilli were inoculated with a mixture of equal numbers of wild type L. reuteri 100-23 and ureC mutant cells, the wild type constituted 99% of the resulting Lactobacillus population in the stomach, caecum and jejunum after one week (108 cells/gram of sample). This study has therefore shown the importance of a functional urease enzyme in the ecological fitness of L. reuteri 100-23.
2012-09-30 | GSE36286 | GEO
Project description:This SuperSeries is composed of the following subset Series: GSE11860: The impact of glycerol on the metabolism of Lactobacillus reuteri - Exploratory experiment GSE11861: The impact of glycerol on the metabolism of Lactobacillus reuteri - Main experiment Refer to individual Series
2010-05-20 | E-GEOD-11885 | biostudies-arrayexpress
Project description:Lactobacillus reuteri 100-23 is an autochthonous inhabitant of the rodent gastrointestinal system that adheres to the non-secretory epithelium of the forestomach and forms biofilms. Microarray analysis of the expression profile of L. reuteri 100-23 cells harvested from the stomach of ex-Lactobacillus-free mice, compared to those of L. reuteri 100-23 in laboratory culture, revealed an in vivo upregulation of a urease gene cluster by greater than 50-fold. Genes for urease production were absent in all publically available Lactobacillus genome sequences except L. reuteri 100-23 and have recently been identified as specific to rodent strains of L. reuteri (Frese et al. 2011). In the current study, the urease enzyme was shown to be functional. Supplementation with 2% urea allowed L. reuteri 100-23 to increase the pH of the culture medium. A mutant strain of L. reuteri 100-23 was developed by insertional inactivation of the ureC gene, which encodes the largest subunit of the urease enzyme. The mutant strain was unable to hydrolyze urea to increase the pH of culture medium, and did not survive acid stress at pH 2.5 for 6 h, even in the presence of urea. In contrast, the wild type strain was still viable after 6 h when 2% urea supplementation was included. When mice free of lactobacilli were inoculated with a mixture of equal numbers of wild type L. reuteri 100-23 and ureC mutant cells, the wild type constituted 99% of the resulting Lactobacillus population in the stomach, caecum and jejunum after one week (108 cells/gram of sample). This study has therefore shown the importance of a functional urease enzyme in the ecological fitness of L. reuteri 100-23. Analysis of the microarray data was obtained from two independent biological replicates.
2012-09-30 | E-GEOD-36286 | biostudies-arrayexpress
Project description:Lactobacillus reuteri is a heterofermentative lactic acid bacterium best known for its ability to co-ferment glucose and glycerol. Its genome sequence has recently been deduced enabling the implementation of genome-wide analysis. In this study we developed a dedicated cDNA microarray platform and a genome-scale metabolic network model of L. reuteri and use them to revisit the co-fermentation of glucose and glycerol. The model was used to simulate experimental conditions and to visualize and integrate experimental data in particular the global transcriptional response of L. reuteri to the presence of glycerol. We show how the presence of glycerol affects cell physiology and triggers specific regulatory mechanisms allowing simultaneously a better yield and more efficient biomass formation. Furthermore we were able to predict and demonstrate for this well-studied condition the involvement of previously unsuspected metabolic pathways for instance related to amino acids and vitamins. These could be used as leads in future studies aiming at the increased production of industrially relevant compounds such as vitamin B12 or 1 3- propanediol. Keywords: cell type comparison Dye swap
2010-05-20 | E-GEOD-11860 | biostudies-arrayexpress
Project description:Lactobacillus reuteri is a heterofermentative lactic acid bacterium best known for its ability to co-ferment glucose and glycerol. Its genome sequence has recently been deduced enabling the implementation of genome-wide analysis. In this study we developed a dedicated cDNA microarray platform and a genome-scale metabolic network model of L. reuteri and use them to revisit the co-fermentation of glucose and glycerol. The model was used to simulate experimental conditions and to visualize and integrate experimental data in particular the global transcriptional response of L. reuteri to the presence of glycerol. We show how the presence of glycerol affects cell physiology and triggers specific regulatory mechanisms allowing simultaneously a better yield and more efficient biomass formation. Furthermore we were able to predict and demonstrate for this well-studied condition the involvement of previously unsuspected metabolic pathways for instance related to amino acids and vitamins. These could be used as leads in future studies aiming at the increased production of industrially relevant compounds such as vitamin B12 or 1 3- propanediol. Keywords: cell type comparison Loop design
2008-09-15 | E-GEOD-11861 | biostudies-arrayexpress
Project description:Lactobacillus reuteri is a heterofermentative lactic acid bacterium best known for its ability to co-ferment glucose and glycerol. Its genome sequence has recently been deduced enabling the implementation of genome-wide analysis. In this study we developed a dedicated cDNA microarray platform and a genome-scale metabolic network model of L. reuteri and use them to revisit the co-fermentation of glucose and glycerol. The model was used to simulate experimental conditions and to visualize and integrate experimental data in particular the global transcriptional response of L. reuteri to the presence of glycerol. We show how the presence of glycerol affects cell physiology and triggers specific regulatory mechanisms allowing simultaneously a better yield and more efficient biomass formation. Furthermore we were able to predict and demonstrate for this well-studied condition the involvement of previously unsuspected metabolic pathways for instance related to amino acids and vitamins. These could be used as leads in future studies aiming at the increased production of industrially relevant compounds such as vitamin B12 or 1 3- propanediol. Keywords: cell type comparison
2008-09-15 | GSE11861 | GEO
Project description:Lactobacillus reuteri is a heterofermentative lactic acid bacterium best known for its ability to co-ferment glucose and glycerol. Its genome sequence has recently been deduced enabling the implementation of genome-wide analysis. In this study we developed a dedicated cDNA microarray platform and a genome-scale metabolic network model of L. reuteri and use them to revisit the co-fermentation of glucose and glycerol. The model was used to simulate experimental conditions and to visualize and integrate experimental data in particular the global transcriptional response of L. reuteri to the presence of glycerol. We show how the presence of glycerol affects cell physiology and triggers specific regulatory mechanisms allowing simultaneously a better yield and more efficient biomass formation. Furthermore we were able to predict and demonstrate for this well-studied condition the involvement of previously unsuspected metabolic pathways for instance related to amino acids and vitamins. These could be used as leads in future studies aiming at the increased production of industrially relevant compounds such as vitamin B12 or 1 3- propanediol. Keywords: cell type comparison
2008-09-15 | GSE11860 | GEO
Project description:A lactobacilli dominated microbiota in most pre and post-menopausal women is an indicator of vaginal health. A Nugent scoring system serves as a proxy for determining the ratio of lactobacilli to other vaginal inhabitants where a high score usually represents a diseased state, whilst an intermediate score represents a warning zone. The objective of this double blinded, placebo-controlled crossover study was to evaluate in 14 post-menopausal women with an intermediate score, the effect of vaginal administration of probiotic L. rhamnosus GR-1 and L. reuteri RC-14 on the microbiota and host response. The probiotic treatment did not result in changes to clinical parameters such as dryness, irritation and comfort, compared to when placebo was applied. Analysis using 16S rRNA sequencing and metabolomics profiling revealed that the proportional abundance of Lactobacillus was increased following probiotic administration as compared to placebo, which was weakly associated with an increase in lactate levels. Analysis of host responses by microarray showed the probiotics had an immune-modulatory response and multiplex cytokine analysis showed up-regulation of IL-5. This is the first study to use an interactomic approach for the study of vaginal probiotic administration in post-menopausal women. It shows that in some cases multifaceted approaches are required to detect the subtle trigger molecular changes induced by the host to instillation of probiotic strains. A total of 35 total RNA samples extracted from vaginal brushes were analyzed on Affymetrix Gene 2.0 ST arrays from 14 Participants collected over multiple visits including administration of either a probiotic supplement or placebo control.
2014-07-20 | E-GEOD-54363 | biostudies-arrayexpress