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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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The involvement of body appearance in influencing the biofilm formation by Escherichia coli K-12 through RodZ

ABSTRACT: Fifty five genes were induced or reduced (2.5-fold) by the absence of rodZ genes Among them, curli production-, cell division-, and biofilm-associated genes as well as phage-related genes were regulated by the RodZ, significantly Three-condition experiment, BW25113 WT/pCA24N vs. rodZ/pCA24N vs. rodZ/pCA24N-RodZ. For preparing the total RNA, each cells were grown at 37Â°C upto OD600=0.5 and then keep growing with 1 mM IPTG for additional 6 h

ORGANISM(S): Escherichia coli

SUBMITTER: Younghoon Kim

PROVIDER: E-GEOD-63052 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Cell wall-deficient Mycoplasma hominis represses biofilm formation of uropathogenic Escherichia coli.

Project description:The features of Mycoplasma in human organ such lung and urinary tract are enigmatic. Here, the role of M. hominis in regard to biofilm formation of uropathogenic Escherichia coli (UPEC) strain CFT073 was investigated. Although M. hominis were inferred to not impact on UPEC bacterial fitness including growth and productions of signaling molecules as autoinducer-2 (AI-2) and indole, we found that the presence of M. hominis dramatically decreased biofilm formation of UPEC CFT073 as well as slightly repressed attachment and cytotoxicity of that. Importantly, this activity was observed on UPEC strain specifically, not enterohemorrhagic E. coli (EHEC) strain that exists on intestine. Whole-transcriptome profiling and quantitative real-time polymerase chain reaction (qRT-PCR) analysis revealed PhoPQ system and anti-termination protein (encoded by ybcQ) participates on the reduction of biofilm formation by M. hominis (corroborated by qRT-PCR). Furthermore, collaborating with previous report that toxin-antitoxin (TA) system involved in biofilm formation, M. hominis increased on the transcriptions of toxin genes including hha (toxin gene in Hha-TomB TA system) and pasT (toxin part in PasT-PasI TA system). Hence, we propose that one possible role of M. hominis is to influence bacterial biofilm formation in urinary tract. Only fourteen genes were induced (2.5-fold) by the presence of M. hominis in Uropathogenic Escherichia coli (UPEC) biofilm cells. Among upregulated genes, ybcQ (encodes anti-termination protein Q homolog) and phoP/phoQ (encode DNA-binding response regulators in two-component regulatory system), were induced by the presence of M. hominis. Two-condition experiment, UPEC CFT073 alone vs. UPEC CFT073 with Mycoplasma hominis PG21 (10^5 ccu/ml). For preparing the total RNA, UPEC CFT073 cells were grown at 37Â°C in biofilm cells on glass wool with or without M. hominis for 24 h.

2016-01-08 | E-GEOD-43376 | biostudies-arrayexpress

Transcriptomic analysis of differential genetic expression under CosR-knockdown condition compared with wild-type

Project description:We perfomed the transcriptomic analysis of differential genetic expression in the CosR-knockdown condition with a DNA microarray. CosR-specific antisense-PNA was used for CosR-knockdown. The results revealed that CosR significantly affected the expression of several genes involved in various cellular function in Campylobacter. Final goal of this study is to figure out the importance and the role of CosR in Campylobacter by identification of the CosR regulons. Two-condition experiment, WT vs. CosR-knockdown. Biological replicates: 3 wild type (control) replicates, 3 CosR-knockdown replicates. For preparing the total RNA, C. jejuni cells were grown at 42M-BM-0C in MH broth supplemented with 1.5 M-NM-<M CosR-PNA for CosR knockdown to the mid-exponential phase for approximately 8 hr with shaking.

2013-01-01 | E-GEOD-40201 | biostudies-arrayexpress

The global gene expression pattern by KDX1 over-expression

Project description:We did transcription profiling on the effect of KDX1 over-expression. Analysis was performed with wild type and KDX1 over-expressed cells ( pRS426-KDX1). Yeast cells were grown on SD-ura medium. Yeast cells were grown overnight at 30M-BM-0C . The culture was refreshed to 0.2 O.D and grown at 30M-BM-0C for 5h 30min. Cells were collected and processed for RNA extraction.

2013-04-03 | E-GEOD-45692 | biostudies-arrayexpress

The global gene expression pattern by RCK1 over-expression

Project description:We did transcription profiling on the effect of RCK1 over-expression. rck1 mutant strain was transformed with empty high copy vector pRS425 empty vector), or with RCK1 cloned into pRS425 (the RCK1-overexpressing strain: RCK1 cloned into pRS425). Analysis was performed with rck1 (Empty vector, pRS425) mutant and RCK1 over-expressed cells (pRS425-RCK1). Yeast cells were grown on SD-leu medium. Yeast cells were grown overnight at 30M-BM-0C . The culture was refreshed to 0.2 O.D and grown at 30M-BM-0C for 2h 30min. Cell wall stress was applied by addition of zymolyase to a final concentration of 5 unit/ml . Cells were collected at 2 hours of growth and processed for RNA extraction.

2013-07-31 | E-GEOD-49340 | biostudies-arrayexpress

Synbiotic impact of tagatose on viability of Lactobacillus rhamnosus strain GG mediated by the phosphotransferase system (PTS)

Project description:The presence of tagatose in Lactobacillus rhamnosus strain GG caused induction of a large number of genes associated with carbohydrate metabolism including the phosphotransferase system. In addition, these results indicate the tagatose enhanced the growth of Lactobacillus casei 01 and Lactobacillus rhamnosus strain GG and their probiotic activities by activating tagatose-associated PTS networks. Two-condition experiment, Lactobacillus rhamnosus GG with glucose vs. Lactobacillus rhamnosus GG with tagatose. For preparing the total RNA, Lactobacillus rhamnosus GG cells were grown at 37M-BM-0C in prebiotic minimum medium supplemented with 2% glucose or tagatose for 24 h.

2013-09-19 | E-GEOD-41073 | biostudies-arrayexpress

A genome-wide transcriptomic analysis of radiation-responsive genes in the radiation-resistant fungus, C. neoformans

Project description:The basidiomycetous fungus Cryptococcus has been known as radiation resistant fungi and is found in highly radioactive environments such as the damaged nuclear reactor at Chernobyl. Although Cryptococcus exhibits greater resistant for gamma radiation than the model yeast Saccharomyces cerevisiae, the resistant mechanism of gamma radiation remains elusive. To elucidate a unique regulatory system for radiation-resistance in C. neoformans, we performed genome-wide comparative analysis through DNA microarray analysis using C. neoformans WT strain (serotype A, H99 strain) responding gamma radiation. Based on the transcriptome analysis, genes involved in DNA damage repair systems (RAD51, RDH54, and RAD54) were significantly increased in response to gamma radiation. Actually, rad54â?? and rdh54â?? mutants exhibited sensitivity against both gamma radiation and DNA damage inducers. Furthermore, genes regarding to molecular chaperone and ubiquitination systems were strongly induced. In contrast, expression levels of genes related to protein synthesis, fatty acids/sterols synthesis, and other cellular molecules. Especially, ergosterol homeostasis is required for gamma radiation resistance. Furthermore, radiation-induced genes such as RIG4, RIG5, and RIG6 in C. neoformans play critical roles in gamma radiation resistance. Taken together, the transcriptome analysis contributes to understanding unique molecular mechanism of radiation-resistant fungus C. neoformans. To elucidate transcriptome change during recovery process post irrdiation, samples were taken at three time interval (30 min, 60 min, and 120 min). The three independent DNA microarry with three independent biological replicates were analyzed to obtain high reliability.

2016-06-01 | E-GEOD-80230 | biostudies-arrayexpress

Metabolic engineering of Corynebacterium glutamicum for L-arginine production

Project description:Metabolically engineered Corynebacterium glutamicum strains were constructed for the enhanced production of L-arginine, and their gene expression profiles were investigated Gene expression profiles of two C. glutamicum strains AR2 and AR6 were examined for the 3043 genes twice.

2013-11-26 | E-GEOD-52737 | biostudies-arrayexpress

RcsB contributes to the distinct stress fitness between Escherichia coli O157:H7 curli variants of 1993 Hamburger-associated outbreak strains

Project description:Curli are adhesive fimbriae of Enterobactericaeae and are involved in surface attachment, cell aggregation and biofilm formation. We previously reported that natural curli variants of E. coli O157:H7 (EcO157) displayed distinct acid resistance; however, this difference was not linked to the curli fimbriae per se. Here, we investigated the underlying molecular basis of this phenotypic divergence between the curli variants. Among curli-producing (C+) variants isolated from the 1993 U.S. hamburger-associated outbreaks strains, we identified large deletions in the rcsB gene that encodes the response regulator of RcsCDB two-component signal transduction system of rcsB ,. Further comparison of stress fitness revealed that C+ variants were also significantly more sensitive to heat shock, but remained similar resistance to osmotic stress and oxidative damage as curli-deficient (C-) variants. Transcriptomics analysis uncovered a large number of differentially expressed genes between the curli variants, characterized by the enhanced expression of genes related to biofilm formation, virulence, catabolic activity and nutrients uptake, but marked decrease in transcription of genes related to various stress resistance in C+ variants. Supplying C+ variants with a functional rcsB restored cells resistance to heat shock and acid challenge, but blocked the curli production, confirming that inactivation of RcsB in C+ variants was the basis of fitness segregation within the EcO157population. This study provides an example of how genome instability of EcO157promotes the intra-population diversification, generating sub-populations carrying an array of distinct phenotypes that may confer the pathogen survival advantages in host and nonhost environments.

2012-08-31 | GSE39439 | GEO

Escherichia coli

Project description:E.coli MG1655Δ6/pCA24N-dinJ treated with erythromycin vs. MG1655Δ6/pCA24N

| PRJNA144405 | ENA

Transcription profiling of E. coli K12 Bw25113/pCA24N-hha with 2 mM IPTG vs BW25113/pCA24N with 2 mM IPTG

Project description:gene expression profiles by overexpressing Hha from pCA24N-hha using 2 mM IPTG induction in BW25113 wild type suspension cells in LB medium at 37C relative to BW25113 carrying the empty vector plasmid in the same test conditions. Experiment Overall Design: Strains: E. coli K12 BW25113/pCA24N, BW25113/pCA24N-hha Experiment Overall Design: Growth conditions: grow culture in LB medium at 37C to OD600 0.1 and add 2 mM IPTG to induce, and grow to OD600 0.5 to collect cells. RNA was extraction, and gene expression profiles were evaluated.

2008-10-20 | E-GEOD-10116 | biostudies-arrayexpress

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