Project description:Purpose: A goal of this study was to identify genes induced in the mother cell during Clostridium difficile sporulation (specifically in a σE-, σK-, and SpoIIID-dependent manner). Methods: Whole genome RNA sequencing was performed on wildtype, sigE-, sigK- and spoIIID- C. difficile strains (strain 630 background; JIR8094 = parent strain), and the transcriptional profiles of the different mutants during growth on 70:30 agar plates were determined using an Illumina MiSeq1000. Results: This analysis identified 200 genes whose expression is collectively activated by sporulation sigma factors: 159 were σF-dependent, 162 were σE-dependent, 28 were σG-dependent, and 36 were σK-dependent. A total of 254 genes were identified as requiring Spo0A for their expression when sporulation was induced on the 70:30 plates. Conclusions: These results provide the first genome-wide transcriptional analysis of genes whose expression is induced by specific sporulation sigma factors in the Clostridia and highlight that diverse mechanisms regulate sporulation sigma factor activity in the Firmicutes. For example, in contrast with the B. subtilis sporulation pathway, C. difficile σE was not required to fully activate σG, and σG was not required to activate σK.

2014-12-02 | GSE63777 | GEO

Clostridiaceae bacterium JC118

Project description:Clostridiaceae bacterium JC118 overview

| PRJNA81053 | ENA

Clostridia bacterium

Project description:Clostridia bacterium overview

| PRJNA700747 | ENA

Functional characterization of helminth-associated Clostridiales reveals covariates of Treg differentiation

Project description:Background: Parasitic helminths influence the composition of the gut microbiome. However, the microbiomes of individuals living in helminth-endemic regions are understudied. The Orang Asli, an indigenous population in Malaysia with high burdens of the helminth Trichuris trichiura, display microbiotas enriched in Clostridiales, an order of spore-forming obligate anaerobes with immunogenic properties. We previously isolated novel Clostridiales that were enriched in these individuals and found that a subset promoted the Trichuris life cycle. In this study, we aimed to further characterize the functional properties of these bacteria.Results: Clostridiales isolates were profiled for their ability to perform 57 enzymatic reactions and produce short chain fatty acids (SCFAs) and hydrogen sulfide, revealing that these bacteria were capable of a range of activities associated with metabolism and host response. Consistent with this finding, monocolonization of mice with individual isolates identified bacteria that were potent inducers of regulatory T cell (Treg) differentiation in the colon. Comparisons between variables revealed by these studies identified enzymatic properties correlated with Treg induction and Trichuris egg hatching.

2024-05-17 | GSE262316 | GEO

Clostridiaceae bacterium JC118

Project description:Clostridiaceae bacterium JC118 Genome sequencing

| PRJEA70545 | ENA

Clostridiaceae bacterium 14S0207

Project description:Clostridiaceae bacterium 14S0207 Genome sequencing

| PRJNA432648 | ENA