Myxococcus xanthus cells: wild-type vs. EBP mutant gene expression during development
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ABSTRACT:
ORGANISM(S): Myxococcus xanthus
PROVIDER: GSE13523 | GEO | 2009/01/28
SECONDARY ACCESSION(S): PRJNA110133
REPOSITORIES: GEO
Similar Datasets
Project description:Transcriptional profiling of Myxococcus xanthus comparing wild-type and mutant gene expression at different developmental time points The mutants in our study, nla4, nla18, nla6 and nla28 are strains that carry a mutation in the corresponding genes nla4 (MXAN2516), nla18 (MXAN3692), nla6(MXAN4042), and nla28(MXAN1167). (MXAN numbers are the conventional gene names; nlas are common names). All four of these genes are response regulators of the ntrC family of transcriptional activators. The mutations were made by insertion of a plasmid (pCR2.1TOPO, invitrogen)into the particular activator gene. Plasmids used carry a region of homology (usually 350-500 bp in length) to the sequence of the activator gene coresponding to the highly conserved central domain that is characteristic of these ntrC family of activators. Plasmids were inserted into the chromosome via homologous recombination at the site of homology to the activator gene. These for genes were originally identified because their mutants have phenotypes with strong defects during development. In all four cases, a mutation in the particular gene gives a phenotype with incomplete or abolished development. In this study, the effects of these mutants were examined on developmental gene expression. Two condition experiment, normal wild-type vs mutant
2010-05-07 | E-GEOD-13523 | biostudies-arrayexpress
Project description:In response to starvation, Myxococcus xanthus initiates a developmental program that results in the formation of spore-filled multicellular fruiting bodies. Here we have used cDNA microarray analysis to determine changes in the global gene expression at different time points of the developmental process. The expression of nearly 900 genes was found to be altered at least two-fold during development as compared to vegetative cells. Genes encoding proteins with typical vegetative functions such as protein synthesis and energy metabolism were transcriptionally down-regulated in the early stages of development. Among the 430 genes transcriptionally up-regulated during development genes with regulatory functions were overrepresented; underlining that fruiting body formation relies on a complex signalling network. Notably, almost 40% of all genes with increased expression at different stages of development encoded hypothetical proteins indicating a large unexplored potential of proteins important for fruiting body formation. Keywords: Time course of development with 9 time points
2008-02-01 | GSE9477 | GEO
Project description:In response to starvation, Myxococcus xanthus initiates a developmental program that results in the formation of spore-filled multicellular fruiting bodies. Here we have used cDNA microarray analysis to determine changes in the global gene expression at different time points of the developmental process. The expression of nearly 900 genes was found to be altered at least two-fold during development as compared to vegetative cells. Genes encoding proteins with typical vegetative functions such as protein synthesis and energy metabolism were transcriptionally down-regulated in the early stages of development. Among the 430 genes transcriptionally up-regulated during development genes with regulatory functions were overrepresented; underlining that fruiting body formation relies on a complex signalling network. Notably, almost 40% of all genes with increased expression at different stages of development encoded hypothetical proteins indicating a large unexplored potential of proteins important for fruiting body formation. Keywords: Time course of development with 9 time points 3 biological replicates each; normalized ratios to vegetative cells of DK1622 (wt) Cy5
2008-01-31 | E-GEOD-9477 | biostudies-arrayexpress
Project description:In response to starvation Myxococcus xanthus initiates a developmental program that culminates in the formation of fruiting bodies inside which the rod-shaped cells differentiate to spores. Fruiting body formation depends on intercellular communication and two intercellular signals are known, the A-signal and the C-signal. Five genes have been identified which are required for A-signal synthesis. To begin to understand the function of the genes required for A-signal synthesis, we have analysed gene expression in the asgA and the asgB mutant. Keywords: Vegetative cells of WT (DK1622) and AsgA mutant (DK5057) and AsgB mutant (DK4398)
2012-05-18 | GSE18029 | GEO
Project description:Myxococcus xanthus is a gram negative rod-shaped delta proteobacterium that differentiates into environmentally resistant spores in response to starvation. Little is known about the sporulation mechanism in part because sporulation occurs in a subpopulation of cells undergoing a lenghtly complex multicellular developmental program. This developmental program requires a solid surface, motility, a minimum population density and a sophisticated network of inter and intra-cellular signals which direct some cells first to aggregate into multicellular fruiting bodies and then to sporulate exclusively within these fruiting bodies. However, it has previously been demonstrated that synchronous conversion of vegetative cells into myxospores can also be triggered in nutrient-rich liquid medium by addition of glycerol to 0.5 M. Here, we took advantage of the glycerol-induced sporulation process to gain information about the core M. xanthus sprorulation mechanism. We determined changes in the global gene expression at 0.5, 1, 2, and 4 hours after glycerol induction compared to vegetative cells (wild-type DK1622). The expression of nearly 1,500 genes was found to be significantly altered at least two-fold within four hours of glycerol-induced development. Most of the known core sporulation marker genes were up-regulated, whereas most genes required for proper aggregation and fruiting body formation were not significantly regulated. Keywords: Time course of glycerol-induced (0.5 M final conc.) development with 4 time points referenced to vegetative cells
2010-05-06 | GSE17912 | GEO
Project description:Myxococcus xanthus is a model organism for studying social behaviors and cell differentiation in bacteria. Upon nutrient depletion, M. xanthus cells initiate a developmental program that culminates in formation of spore-filled fruiting bodies and peripheral rods outside of fruiting bodies. Completion of this developmental program depends on fine-tuned spatial and temporal regulation of gene expression, intercellular communication, signaling by nucleotide-based second messengers, and motility. In order to understand stage-specific gene expression during growth and development, we extracted total RNA from vegetative cells (referred as 0 h of development) and from cells developed for 6, 12, 18 and 24 h under submerged conditions in two replicates.
2021-10-20 | E-MTAB-11043 | biostudies-arrayexpress
Project description:Myxococcus xanthus is a model organism for studying social behaviors and cell differentiation in bacteria. Upon nutrient depletion, M. xanthus cells initiate a developmental program that culminates in formation of spore-filled fruiting bodies and peripheral rods outside of fruiting bodies. Completion of this developmental program depends on fine-tuned spatial and temporal regulation of gene expression, intercellular communication, signaling by nucleotide-based second messengers, and motility. In order to understand regulation of gene expression during growth and development, transcription start sites were identified using Cappable-seq. To this end, we extracted total RNA from vegetative cells (referred as 0 h of development) and from cells developed for 6, 12, 18 and 24 h under submerged conditions in two replicates.
2021-10-20 | E-MTAB-11042 | biostudies-arrayexpress
Project description:In response to starvation Myxococcus xanthus initiates a developmental program that culminates in the formation of fruiting bodies inside which the rod-shaped cells differentiate to spores. Fruiting body formation depends on intercellular communication and two intercellular signals are known, the A-signal and the C-signal. Five genes have been identified which are required for A-signal synthesis. To begin to understand the function of the genes required for A-signal synthesis, we have analysed gene expression in the asgA and the asgB mutant. Keywords: Vegetative cells of WT (DK1622) and AsgA mutant (DK5057) and AsgB mutant (DK4398) 3 biological replicates each; normalized ratios to vegetative cells of DK1622 (wt) Cy5
2012-05-17 | E-GEOD-18029 | biostudies-arrayexpress
Project description:Myxococcus xanthus is a gram negative rod-shaped delta proteobacterium that differentiates into environmentally resistant spores in response to starvation. Little is known about the sporulation mechanism in part because sporulation occurs in a subpopulation of cells undergoing a lenghtly complex multicellular developmental program. This developmental program requires a solid surface, motility, a minimum population density and a sophisticated network of inter and intra-cellular signals which direct some cells first to aggregate into multicellular fruiting bodies and then to sporulate exclusively within these fruiting bodies. However, it has previously been demonstrated that synchronous conversion of vegetative cells into myxospores can also be triggered in nutrient-rich liquid medium by addition of glycerol to 0.5 M. Here, we took advantage of the glycerol-induced sporulation process to gain information about the core M. xanthus sprorulation mechanism. We determined changes in the global gene expression at 0.5, 1, 2, and 4 hours after glycerol induction compared to vegetative cells (wild-type DK1622). The expression of nearly 1,500 genes was found to be significantly altered at least two-fold within four hours of glycerol-induced development. Most of the known core sporulation marker genes were up-regulated, whereas most genes required for proper aggregation and fruiting body formation were not significantly regulated. Keywords: Time course of glycerol-induced (0.5 M final conc.) development with 4 time points referenced to vegetative cells 3 biological replicates each; normalized ratios to vegetative cells of DK1622 (wt) Cy3
2010-05-06 | E-GEOD-17912 | biostudies-arrayexpress
Project description:Spatial organization of cells is important for both multicellular development and tactic responses to a changing environment. We find that the social bacterium, Myxococcus xanthus utilizes a chemotaxis (Che)-like pathway to regulate multicellular rippling during predation of other microbial species. Tracking of GFP-labeled cells indicates directed movement of M. xanthus cells during the formation of rippling wave structures. Quantitative analysis of rippling indicates that ripple wavelength is adaptable and dependent on prey cell availability. Methylation of the receptor, FrzCD is required for this adaptation: a frzF methyltransferase mutant is unable to construct ripples, whereas a frzG methylesterase mutant forms numerous, tightly packed ripples. Both the frzF and frzG mutant strains are defective in directing cell movement through prey colonies. These data indicate that the transition to an organized multicellular state during predation in M. xanthus relies on the tactic behavior of individual cells, mediated by a Che-like signal transduction pathway.
| S-EPMC2579389 | biostudies-literature