Polysphondylium violaceum cell type specific transcriptomes
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PROVIDER: PRJEB34080 | ENA |
REPOSITORIES: ENA
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Project description:The experiment was performed with the intention of collecting transcriptomic data from isolated cell types (spore, stalk and vegetative cells) in Dictyostelium lacteum as well as from cysts in Polyshpondlyium pallidum. By combining these data with similar cell-type specific RNA-Seq data from other organisms, and by examining the expression patterns of transcription factor genes, we tried to characterize how gene regulation for cell differentiation evolved in Dictyostelia. Specifically ,we dissociated and collected spore and stalk from the fruiting bodies of D. lacteum at 24 hours of development. We also collected exponentially growing vegetative cells of D. lacteum. For collecting P. pallidum cyst samples, cells were induced to encyst with sorbitol, and samples were collected at 0, 8, 16, and 24 h of incubation. RNA was extracted using the RNeasy kit (QIAGEN), and cDNA libraries were made using the Illumina TruSeq kit. The Illumina sequencing platforms (NextSeq500 for D. lacteum samples, and Hi-seq 2000 for P. pallidum samples) were used for sequencing.
2019-10-31 | E-MTAB-7824 | biostudies-arrayexpress
Project description:In the social amoebae (Dictyostelia) quorum sensing system mediates aggregation of single cells into multicellular aggregates by chemotactic movement towards gradients of diffusible molecules known as acrasins. The acrasin of P. violaceum is the unusual dipeptide N-propionyl-gamma-L-glutamyl-L-ornithine-delta-lactam-ethylester, known as glorin. Phylogenetic analysis has indicated that P. violaceum is more related to the most derived group 4 dictyostelids than to the ancient group 2 polysphondylids such as P. pallidum. Nevertheless it has been reported that P. pallidum cells respond to glorin in chemotaxis assays. This has led to the assumption that glorin-based communication may be the most ancient form of intercellular communication that Dictyostelia invented to organize early steps of multicellular development. In this study we show that glorin mediates rapid changes in gene expression at the transition from vegetative growth to aggregation, apparently without pronounced cross-talk with the cyclic AMP-based communication system that coordinates post-aggregation events in this species. We describe glorin-mediated changes in gene expression in the social amoeba Polysphondylium pallidum at the transition from unicellular growth to multicellular development. Comparison of gene expression in growing cells versus cells starving for 2 or 3 hours in the presence or absence of glorin.
2010-10-29 | E-GEOD-24911 | biostudies-arrayexpress
Project description:spaA is a Cud-type transcription factor that is essential for spore cell differentiation of Dictyostelium discoideum, a social amoeba. ChIP-seq was performed to identify spaA target genes.
2018-05-31 | E-MTAB-6000 | biostudies-arrayexpress
Project description:In the social amoebae (Dictyostelia) quorum sensing system mediates aggregation of single cells into multicellular aggregates by chemotactic movement towards gradients of diffusible molecules known as acrasins. The acrasin of P. violaceum is the unusual dipeptide N-propionyl-gamma-L-glutamyl-L-ornithine-delta-lactam-ethylester, known as glorin. Phylogenetic analysis has indicated that P. violaceum is more related to the most derived group 4 dictyostelids than to the ancient group 2 polysphondylids such as P. pallidum. Nevertheless it has been reported that P. pallidum cells respond to glorin in chemotaxis assays. This has led to the assumption that glorin-based communication may be the most ancient form of intercellular communication that Dictyostelia invented to organize early steps of multicellular development. In this study we show that glorin mediates rapid changes in gene expression at the transition from vegetative growth to aggregation, apparently without pronounced cross-talk with the cyclic AMP-based communication system that coordinates post-aggregation events in this species. We describe glorin-mediated changes in gene expression in the social amoeba Polysphondylium pallidum at the transition from unicellular growth to multicellular development.
2010-10-29 | GSE24911 | GEO
Project description:Here, we described a novel transcriptional regulator belonging to the MarR family that we named OsbR (oxidative stress response and biofilm formation regulator) in the opportunistic pathogen Chromobacterium violaceum. Transcriptome profiling by DNA microarray using strains with deletion or overexpression of osbR showed that OsbR exert a global regulatory role in C. violaceum, regulating genes involved in oxidative stress response, nitrate reduction, biofilm formation, and several metabolic pathways. EMSA assays showed that OsbR binds to the promoter regions of several OsbR-regulated genes and the in vitro DNA binding activity was inhibited by oxidants. We demonstrated that the overexpression of osbR caused activation of ohrA even in the presence of the repressor OhrR, which resulted in improved growth under organic hydroperoxide treatment. We showed that the proper regulation of the nar genes by OsbR ensures an optimal growth of C. violaceum under anaerobic conditions by tuning the reduction of nitrate to nitrite. Finally, the osbR overexpressing strain showed reduction in biofilm formation and this phenotype correlated with the OsbR-mediated repression of two gene clusters encoding putative adhesins.
2021-04-11 | GSE171860 | GEO
Project description:The intent of the experiment was to gather transcriptomic data from terminally differentiated cell types --spore, stalk, and cup cells-- in a simple multicellular model system, Dictyostelium discoideum, in order to characterize the cell-type specific gene expression patterns. Specifically, we dissociated and collected each cell type from the fruiting bodies of D. discoideum at 24 hours of development. We also collected exponentially growing vegetative cells of D. discoideum.
2019-01-31 | E-MTAB-7215 | biostudies-arrayexpress
Project description:Antibiotic resistance can arise by several mechanisms, including mutation in transcription factors that regulate drug efflux pumps. In this work, we identified EmrR as a MarR family transcription factor involved in antibiotic resistance in Chromobacterium violaceum, a Gram-negative bacterium that occurs in soil and water and can act as a human opportunistic pathogen. Antibiogram and minimum inhibitory concentration (MIC) assays showed that the ΔemrR mutant presented increased resistance to the antibiotic nalidixic acid in respect to the wild-type strain. The emrR gene is near to a putative operon emrCAB, which encode the efflux pump EmrCAB. DNA Microarray analysis showed that EmrR represses the emrCAB operon and some other putative transporters. Northern blot assays validated that EmrR represses the emrCAB operon and this repression can be released by salicylate, but not other compounds such as nalidixic acid or ethidium bromide. Electrophoretic mobility shift assays (EMSA) showed that EmrR binds directly to the promoter regions of emrR, emrCAB and other genes to exert negative regulation. Therefore, in response to compounds as salicylate, EmrR derepresses the operon emrCAB causing overexpression of the efflux pump EmrCAB and increased resistance to nalidixic acid in C. violaceum.
2018-11-01 | GSE112521 | GEO
Project description:In this study, we used transcriptional profiling to define the adaptive response of C. violaceum to oxidative stress induced by cumene hydroperoxide (CHP) and to identify the OhrR regulon. DNA microarray and northern blot analysis revealed that in CHP-treated cells occur strong upregulation of genes involved in many pathways for stress protection, including antioxidant enzymes (catalase and peroxidases), thioredoxin, glutaredoxin and lipoyl-dependent reducing systems, DNA repair enzymes, heat shock response (σ32 regulon), iron limitation (Fur regulon) and nitrogen starvation. Genes encoding glyoxalases, glutathione S-transferases and oxygenases were also induced, suggesting further catabolism of the aromatic compound CHP. Pathways downregulated by CHP stress include electron transport chain, nucleotide biosynthesis and unsaturation of fatty acids. Further, we identified two upregulated genes (OhrA and a protein with GGDEF domain for c-di-GMP synthesis) and three downregulated genes (hemolysin, chitinase and collagenase) in the ohrR mutant. Using a mouse infection model, we demonstrate that the ohrR mutant, but not the ohrA mutant, is attenuated for virulence and showed a decreased bacterial burden in the liver. Therefore, we have defined the CHP stimulon and determined that C. violaceum uses the organic hydroperoxide sensor OhrR for regulate expression of genes required to antioxidant defense and to modulate virulence in its interaction with the host.
2017-05-01 | GSE90551 | GEO