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Transcriptional portrait of M. bovis BCG during in vitro biofilm production shows genes differentially expressed during intercellular aggregation and substrate attachment.

ABSTRACT: By RNA-seq analysis, we monitored the early steps of biofilm production in BCG, to distinguish intercellular aggregation from attachment to a surface, and found a number of genes being differentially expressed at these stages.

ORGANISM(S): Mycobacterium tuberculosis variant bovis BCG

PROVIDER: GSE150030 | GEO | 2020/08/03

REPOSITORIES: GEO

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Transcriptional portrait of M. bovis BCG during biofilm production shows genes differentially expressed during intercellular aggregation and substrate attachment.

Project description:Mycobacterium tuberculosis and M. smegmatis form drug-tolerant biofilms through dedicated genetic programs. In support of a stepwise process regulating biofilm production in mycobacteria, it was shown elsewhere that lsr2 participates in intercellular aggregation, while groEL1 was required for biofilm maturation in M. smegmatis. Here, by means of RNA-Seq, we monitored the early steps of biofilm production in M. bovis BCG, to distinguish intercellular aggregation from attachment to a surface. Genes encoding for the transcriptional regulators dosR and BCG0114 (Rv0081) were significantly regulated and responded differently to intercellular aggregation and surface attachment. Moreover, a M. tuberculosis H37Rv deletion mutant in the Rv3134c-dosS-dosR regulon, formed less biofilm than wild type M. tuberculosis, a phenotype reverted upon reintroduction of this operon into the mutant. Combining RT-qPCR with microbiological assays (colony and surface pellicle morphologies, biofilm quantification, Ziehl-Neelsen staining, growth curve and replication of planktonic cells), we found that BCG0642c affected biofilm production and replication of planktonic BCG, whereas ethR affected only phenotypes linked to planktonic cells despite its downregulation at the intercellular aggregation step. Our results provide evidence for a stage-dependent expression of genes that contribute to biofilm production in slow-growing mycobacteria.

| S-EPMC7387457 | biostudies-literature

Transcriptional portrait of M. bovis BCG during in vitro biofilm production shows genes differentially expressed during intercellular aggregation and substrate attachment.

Project description:Transcriptional portrait of M. bovis BCG during in vitro biofilm production shows genes differentially expressed during intercellular aggregation and substrate attachment.

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Transcriptional portrait of M. bovis BCGΔBCG1419c during in vitro planktonic culture

Project description:We have developed the vaccine candidate BCGΔBCG1419c, by deletion of BCG1419c in BCG Pasteur ATCC 35734, which improved control of tuberculosis (TB) in preclinical models. Here, we compared the transcriptomes of BCG and BCGΔBCG1419c during planktonic growth.

2024-06-12 | GSE251760 | GEO

M. bovis BCG PknG physiological substrates

Project description:Mycobacterial Ser/Thr kinases play a critical role in bacterial physiology and pathogenesis. Linking kinases to the substrates they phosphorylate in vivo, thereby elucidating their exact functions, is still a challenge. The aim of this work was to associate protein phosphorylation in mycobacteria with important subsequent macro cellular events by identifying the physiological substrates of PknG in Mycobacterium bovis BCG. The study compared the phosphoproteome dynamics during the batch growth of M. bovis BGC versus the respective PknG knock-out mutant (ΔPknG-BCG) strains.

2018-03-23 | PXD006473 | Pride

Microarray Analysis of Toxicogenomic Effects of Triclosan on Mycobacterium bovis BCG

2012-12-25 | GSE33800 | GEO

Microarray Analysis of Toxicogenomic Effects of Sodium Hypochlorite on Mycobacterium bovis BCG

Project description:In the present study, we employed Affymetrix Mycobacterium bovis BCG GeneChip arrays to investigate the dynamics of global gene expression profiles during the cellular response of Mycobacterium bovis BCG to Sodium Hypochlorite, which involved initial growth inhibition and metabolism. Keywords: Transcriptome study

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Microarray Analysis of Toxicogenomic Effects of Hydrogen Peroxide on Mycobacterium bovis BCG

Project description:In the present study, we employed Affymetrix Mycobacterium bovis BCG GeneChip arrays to investigate the dynamics of global gene expression profiles during the cellular response of Mycobacterium bovis BCG to hydrogen peroxide, which involved initial growth inhibition and metabolism. Keywords: Transcriptome study

2009-01-20 | GSE14272 | GEO

Microarray Analysis of Toxicogenomic Effects of peracetic acid on Mycobacterium bovis BCG

Project description:In the present study, we employed Affymetrix Mycobacterium bovis BCG GeneChip arrays to investigate the dynamics of global gene expression profiles during the cellular response of Mycobacterium bovis BCG to Peracetic acid, which involved initial growth inhibition and metabolism. Keywords: Transcriptome study

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Mycobacterium bovis Bacillus Calmette-Guerin (BCG) reprograms melanoma microenvironment to promote antitumor T cell responses

Project description:Intralesional therapy using Mycobacterium bovis Bacillus Calmette-Guérin (BCG) for cutaneous metastatic melanoma induces regression of injected, but also non-injected lesions. Tumor-associated macrophages (also known as M2) infiltrate solid tumors and impair antitumor immunity. Since macrophages play a pivotal role in both tumors and mycobacterial infections, we hypothesized BCG alters M2 to promote antitumor immunity. BCG-treated, in vitro-polarized M2 (M2-BCG) show dramatic transcriptional changes involving inflammation, immune cell recruitment, cross-talk and activation pathways. Mechanistic network analysis indicates potential for M2-BCG to improve IFN-γ responses, frequently used as a marker for successful antitumor immunity. Accordingly, we found an increased frequency of IFN-γ-producing CD4+ T cells responding to M2-BCG vs mock-treated M2 (p<0.05). Moreover, supernatant from M2-BCG increased the frequency of granzyme B-producing CD8+ tumor-infiltrating lymphocytes (TIL) responding to autologous melanoma cell lines (p<0.01). Comparing the transcriptome of injected vs uninjected lesions biopsied from IL-BCG patients showed immune function prevailing in injected lesions, with the most enriched pathways representing T cell activation mechanisms. In vitro BCG-infected tumor cells also stimulated IFN-γ production from HLA-A2-restricted syngeneic TIL from the same melanoma patient (p<0.05). Together, our data indicates BCG can promote an antitumor microenvironment in cutaneous metastatic melanoma.

2017-09-14 | GSE90748 | GEO

Microarray Analysis of Toxicogenomic Effects of Triclosan on Mycobacterium bovis BCG

Project description:Global gene expression analysis of Mycobacterium bovis BCG following Triclosan treatment using Affymetrix GeneChip arrays. Results from this study provide insight into the molecular mechanisms underlying the cellular response of Mycobacterium bovis BCG to Triclosan We conducted three independent microarray experiments (biological replicates) in the absence (control) and the presence (experimental) of triclosan. Fold change was calculated as a ration between the signal averages of three untreated (control) and three triclosan-treated (experimental) cultures for 0, 10 and 60min exposures.

2012-12-25 | E-GEOD-33800 | biostudies-arrayexpress

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