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Dictyostelium discoideum

ABSTRACT: Bacterial discrimination by Dictyostelid amoebae reveals the complexity of ancient interspecies interactions

PROVIDER: PRJNA198906 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR835196.fastq.gz	Fastqsanger.gz
	SRR835197.fastq.gz	Fastqsanger.gz
	SRR835198.fastq.gz	Fastqsanger.gz
	SRR835199.fastq.gz	Fastqsanger.gz
	SRR835200.fastq.gz	Fastqsanger.gz

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Dictyostelium discoideum

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Transcriptional responses of Dictyostelium discoideum exposed to different classes of bacteria

Project description:Dictyostelium discoideum amoebae feed by ingesting bacteria, then killing them in phagosomes. Ingestion and killing of different bacteria have been shown to rely on largely different molecular mechanisms. One would thus expect that D. discoideum adapts its ingestion and killing machinery when encountering different bacteria. In this study, we investigated by RNA sequencing if and how D. discoideum amoebae respond to the presence of different bacteria by modifying their gene expression patterns. Each bacterial species analyzed induced a specific modification of the transcriptome. Bacteria such as Bacillus subtilis, Klebsiella pneumoniae, or Mycobacterium marinum induced a specific and different transcriptional response, while Micrococcus luteus did not trigger a significant gene regulation. Although folate has been proposed to be one of the key molecules secreted by bacteria and recognized by hunting amoebae, it elicited a very specific and restricted transcriptional signature, distinct from that triggered by any bacteria analyzed here. Our results indicate that D. discoideum amoebae respond in a highly specific, almost non-overlapping manner to different species of bacteria. We additionally identify specific sets of genes that can be used as reporters of the response of D. discoideum to different bacteria.

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Dictyostelium discoideum

Project description:Allorecognition, via TgrB1 and TgrC1, mediates the transition from unicellularity to multicellularity in the social amoebae Dictyostelium discoideum

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Transcriptional profiles of B. bronchiseptica survived inside Dictyostelium discoideum or cultured in medium

Project description:Purpose: To filter genes that may contribute to introcellualr survival of B. bronchiseptica inside Dictyostelium discoideum, the genes that differently expressed when bacteria inside amoebae or in culture medium are selected as target genes.

2021-12-10 | GSE190363 | GEO

The long non-coding RNA transcriptome of Dictyostelium discoideum development

Project description:This study details the content and dynamics of the long non-coding transcriptome during D. discoideum development, providing an important compendium to the well-characterized protein coding transcriptome. Applying a novel sample preparation method, we isolated antisense and long intergenic non-coding RNAs in addition to mRNAs. We describe the behavior of these different classes of RNAs that have been shown to play important regulatory roles in numerous model systems. Our analyses contribute a wholly different perspective to the most widely appreciated and compelling aspect of Dictyostelium biology—the change in life style from solitary amoebae to differentiated multicellular organisms.

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Project description:MicroRNAs in Amoebozoa: Deep sequencing of the small RNA population in the social amoeba Dictyostelium discoideum reveals developmentally regulated microRNAs

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Developmental commitment in Dictyostelium discoideum.

Project description:Upon starvation, Dictyostelium discoideum cells halt cell proliferation, aggregate into multicellular organisms, form migrating slugs, and undergo morphogenesis into fruiting bodies while differentiating into dormant spores and dead stalk cells. At almost any developmental stage cells can be forced to dedifferentiate when they are dispersed and diluted into nutrient broth. However, migrating slugs can traverse lawns of bacteria for days without dedifferentiating, ignoring abundant nutrients and continuing development. We now show that developing Dictyostelium cells revert to the growth phase only when bacteria are supplied during the first 4 to 6 h of development but that after this time, cells continue to develop regardless of the presence of food. We postulate that the cells' inability to revert to the growth phase after 6 h represents a commitment to development. We show that the onset of commitment correlates with the cells' loss of phagocytic function. By examining mutant strains, we also show that commitment requires extracellular cyclic AMP (cAMP) signaling. Moreover, cAMP pulses are sufficient to induce both commitment and the loss of phagocytosis in starving cells, whereas starvation alone is insufficient. Finally, we show that the inhibition of development by food prior to commitment is independent of contact between the cells and the bacteria and that small soluble molecules, probably amino acids, inhibit development during the first few hours and subsequently the cells become unable to react to the molecules and commit to development. We propose that commitment serves as a checkpoint that ensures the completion of cooperative aggregation of developing Dictyostelium cells once it has begun, dampening the response to nutritional cues that might inappropriately block development.

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