Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Expression data from Adult Drosophila with controled microbiota

ABSTRACT: The microbial population that live within the gut of animals influences their physiology. We used axenic and recolonized flies to identify genes whose expression is modulated by the presence of a bacterial flora in the gut. We identified several up regulated genes, most of which are described as enriched in the midgut, and related either to immunity or to metabolism. This work also suggests that most microbiota regulated genes are Relish dependent. We raised axenic Flies and either : (1) kept them germ free or (2) recolonized their environment with a set of 4 known commensal bacteria of lab-raised drosophila (Commensalibacter intestini, Lactobacillus plantarum, Lactobacillus brevis, Acetobacter pomorum). Flies were maintained in their respective (axenic or recolonized) environment from emergence to 7 days of age. Then females were collected, and total RNA extraction was performed on groups of 20 whole bodies.

ORGANISM(S): Drosophila melanogaster

SUBMITTER: François Leulier

PROVIDER: E-GEOD-56173 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Drosophila microbiota modulates host metabolic gene expression via IMD/NF-κB signaling.

Erkosar Berra B Defaye Arnaud A Bozonnet Noémie N Puthier Denis D Royet Julien J Leulier François F

PloS one 20140414 4

Most metazoans engage in mutualistic interactions with their intestinal microbiota. Despite recent progress the molecular mechanisms through which microbiota exerts its beneficial influences on host physiology are still largely uncharacterized. Here we use axenic Drosophila melanogaster adults associated with a standardized microbiota composed of a defined set of commensal bacterial strains to study the impact of microbiota association on its host transcriptome. Our results demonstrate that Dros ...[more]

PMID: 24733183

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Project description:The intricate regulation of gut homeostasis is dependent on a fine-tuned regulation of the host defense to avoid detrimental immune activation. We have previously applied Drosophila to show that mutants of the short isoform of the POU transcription factor Pdm1/nubbin (nub) have a constitutively active immune response, altered gut microbiota and shortened lifespan. Here, we studied the role of Nub-PB, the larger isoform derived from the nub gene. Both Nub protein isoforms contain the C-terminal POU and Homeo domains whereas Nub-PB encompasses a longer N-terminal end. Microarray analysis revealed that targeted misexpression of Nub-PB in immunocompetent organs triggers a strong and broad expression of immune genes in a comparable manner to Nub-PD mutants. The seemingly antagonistic functions of the two isoforms were confirmed by co-overexpression of both forms, which resulted in normal expression levels of antimicrobial peptide (AMP) genes. Cell line experiments demonstrated a synergistic activation of AMPs by the combined transfection with Nub-PB and NF-kB/Relish. In agreement with this finding, Relish was indispensable for Nub-PB-driven diptericin expression, suggesting that Nub-PB acts as a Relish co-activator. Moreover, Nub-PB triggered strong expression of gut-specific drosomycin-like genes in a JAK/STAT pathway-dependent manner. Using RNA interference, we found that Nub-PB influences antimicrobial peptide expression in gut but not fat body tissues. Moreover, Nub-PB expression levels in gut enterocytes correlated with the gut bacterial load as well as host lifespan, suggesting a profound role in host immunity. Surprisingly, Nub-PB-overexpression caused a hypersensitive infection phenotype as flies succumbed within 24 h to orally administered Erwinia carotovora carotovora 15. Nub-PB thus appears to be a central activator of gut immunity that requires tight control, executed at least in part, by isoform antagonism to maintain immune homeostasis.

Dataset Information

Expression data from Adult Drosophila with controled microbiota

Publications

Drosophila microbiota modulates host metabolic gene expression via IMD/NF-κB signaling.

Similar Datasets

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