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ABSTRACT:
PROVIDER: PRJNA629992 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Euprymna scolopes light-organ transcriptome (4 weeks)
| PRJNA320238 | ENA
Project description:The bioluminescent bacterium Vibrio fischeri forms a mutually beneficial symbiosis with the Hawaiian bobtail squid, Euprymna scolopes, in which the bacteria, housed inside a specialized light organ, produce light used by the squid in its nocturnal activities. Upon hatching, E. scolopes juveniles acquire V. fischeri from the seawater through a complex process that requires, among other factors, chemotaxis by the bacteria along a gradient of N-acetylated sugars into the crypts of the light organ, the niche in which the bacteria reside. Once inside the light organ, V. fischeri transitions into a symbiotic, sessile state in which the quorum-signaling regulator LitR induces luminescence. In this work we show that expression of litR and luminescence are repressed by a homolog of the V. cholerae virulence factor TcpP, which we have named HbtR. Further, we demonstrate that LitR represses genes involved in motility and chemotaxis into the light organ and activates genes required for exopolysaccharide production. Importance: TcpP homologs are widespread throughout the Vibrio genus; however, the only protein in this family described thus far is a V. cholerae virulence regulator. Here we show that HbtR, the TcpP homolog in V. fischeri, has both a biological role and regulatory pathway completely unlike that in V. cholerae. Through its repression of the quorum-signaling regulator LitR, HbtR affects the expression of genes important for colonization of the E. scolopes light organ. While LitR becomes activated within the crypts, and upregulates luminescence and exopolysaccharide genes and downregulates chemotaxis and motility genes, it appears that HbtR, upon expulsion of V. fischeri cells into seawater, reverses this process to aid the switch from a symbiotic to a planktonic state. The possible importance of HbtR to the survival of V. fischeri outside of its animal host may have broader implications for the ways in which bacteria transition between often vastly different environmental niches.
2020-06-03 | GSE151621 | GEO
Project description:Euprymna scolopes Transcriptome (3h light organs)
| PRJNA205147 | ENA
Project description:Euprymna scolopes Transcriptome or Gene expression
| PRJNA498343 | ENA
Project description:Euprymna scolopes Transcriptome or Gene expression
| PRJNA282884 | ENA
Project description:Euprymna scolopes Transcriptome or Gene expression
| PRJNA357702 | ENA
Project description:Euprymna scolopes Transcriptome or Gene expression
| PRJNA253571 | ENA
Project description:Euprymna scolopes Transcriptome or Gene expression
| PRJNA473394 | ENA
Project description:The bioluminescent bacterium Vibrio fischeri initiates a specific, persistent symbiosis in the light organ of the squid Euprymna scolopes. During the early stages of colonization, V. fischeri is exposed to host-derived nitric oxide (NO). While NO can be both an antimicrobial component of innate immunity and a common signaling molecule of eukaryotes, its roles in beneficial host-microbe associations remain undescribed. V. fischeri encodes HnoX, a member of a family of bacterial NO-binding proteins of unknown function. We hypothesized that HnoX acts as a NO sensor that is involved in regulating symbiosis-related genes during initiation of symbiosis. With an aim to discover the genes whose regulations respond to NO signal, and in an HnoX-mediated fashion in particular, we carried out a whole-genome expression study on the wild-type and an insertional mutant of hnoX.
2010-03-01 | GSE15522 | GEO