Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1158564 | ENA |
REPOSITORIES: ENA
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Project description:Clostridioides difficile infection (CDI), caused by strains producing toxin B (TcdB), poses a significant global health threat. While C. difficile exhibits substantial diversity, functional studies have focused on a limited number of isolates, overlooking other genomospecies within the genus. We describe five isolates from patients suspected of having CDI who tested negative for the PaLoc marker gene tcdC. Through genomic, proteomic, and phenotypic analyses, we demonstrate that they correspond to three novel toxin-producing species, designated as Clostridioides cryptodifficilis sp. nov., Clostridioides divergens sp. nov., and Clostridioides subdifficilis sp. nov. These species are distinguished by unique MALDI-ToF signatures, metabolic capabilities, and genomic and proteomic architectures, underscoring their clear taxonomic and functional divergence from C. difficile. They secrete functionally active TcdB7 or TcdB11, as demonstrated by cytotoxicity assays in cultured cells and in vivo using the mouse ileal loop model, implicating them in disease pathology, albeit with lower virulence than C. difficile. Our findings expand the known diversity of TcdB-producing Clostridioides and have direct implications for diagnostics, surveillance, and clinical management of diarrheal diseases.
2026-05-06 | PXD067952 | Pride
Project description:Clostridioides difficile infection (CDI), caused by strains producing toxin B (TcdB), poses a significant global health threat. While C. difficile exhibits substantial diversity, functional studies have focused on a limited number of isolates, overlooking other genomospecies within the genus. We describe five isolates from patients suspected of having CDI who tested negative for the PaLoc marker gene tcdC. Through genomic, proteomic, and phenotypic analyses, we demonstrate that they correspond to three novel toxin-producing species, designated as Clostridioides cryptodifficilis sp. nov., Clostridioides divergens sp. nov., and Clostridioides subdifficilis sp. nov. These species are distinguished by unique MALDI-ToF signatures, metabolic capabilities, and genomic and proteomic architectures, underscoring their clear taxonomic and functional divergence from C. difficile. They secrete functionally active TcdB7 or TcdB11, as demonstrated by cytotoxicity assays in cultured cells and in vivo using the mouse ileal loop model, implicating them in disease pathology, albeit with lower virulence than C. difficile. Our findings expand the known diversity of TcdB-producing Clostridioides and have direct implications for diagnostics, surveillance, and clinical management of diarrheal diseases.
2026-05-06 | PXD066931 | Pride
Project description:Two novel toxins of Oulactis sp. nov.
| PRJEB24987 | ENA
Project description:Isolation and characterization of two recently isolated Novosphingobium oxfordensis sp. nov. and Novosphingobium mississippiensis sp. nov. strains from soil, with LCMS and genome-based investigation of their glycosphingolipid productions
2024-07-03 | MSV000095235 | MassIVE
Project description:Expanding the verrucomicrobial methanotrophic world: Draft genomes of two novel species of Methylacidimicrobium gen. nov.
| PRJEB32513 | ENA
Project description:Bartonelloses are neglected emerging infectious diseases caused by facultatively intracellular bacteria transmitted between vertebrate hosts by various arthropod vectors. The highest diversity of Bartonella species has been identified in rodents. Within this study we focused on the edible dormouse (Glis glis), a rodent with unique life-history traits that often enters households and whose possible role in the epidemiology of Bartonella infections had been previously unknown. We identified and cultivated two distinct Bartonella sub(species) significantly diverging from previously described species, which were characterized using growth characteristics, biochemical tests, and various molecular techniques including also proteomics. Two novel (sub)species were described: Bartonella grahamii subsp. shimonis subsp. nov. and Bartonella gliris sp. nov.We sequenced two individual strains per each described (sub)species. During exploratory genomic analyses comparing two genotypes ultimately belonging to the same species, both factually and most importantly even spatiotemporally, we noticed unexpectedly significant structural variation between them. We found that most of the detected structural variants could be explained either by prophage excision or integration. Based on a detailed study of one such event, we argue that prophage deletion represents the most probable explanation of the observed phenomena.Moreover, in one strain of Bartonella grahamii subsp. shimonis subsp. nov. we identified a deletion related to Bartonella Adhesin A, a major pathogenicity factor that modulates bacteria-host interactions. Altogether, our results suggest that even a limited number of passages induced sufficient selective pressure to promote significant changes at the level of the genome.
2023-10-28 | PXD046060 | Pride