Vaccination against Shigella and ETEC
Ontology highlight
ABSTRACT:
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR1107833_1.fastq.gz | Fastqsanger.gz | |||
| ERR1107833_2.fastq.gz | Fastqsanger.gz | |||
| ERR477376_1.fastq.gz | Fastqsanger.gz | |||
| ERR477376_2.fastq.gz | Fastqsanger.gz | |||
| ERR477377_1.fastq.gz | Fastqsanger.gz |
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Project description:Enterotoxigenic E. coli (ETEC) is a major cause of moderate to severe diarrhoea in low-middle income countries (LMICs) and affects mostly children and travelers to endemic regions. ETEC are highly diverse pathovar with over 25 colonisation factors (fimbriae) described. The development of a broadly protective vaccine to cover most of the ETEC variants is critical for disease control. This study evaluated whether vaccination with ETVAX®; the most clinically advanced ETEC vaccine candidate results in IgG responses that cross-react with other ETEC antigens/ colonisation factors not overexpressed in the vaccine. A proteome microarray was used to assess IgG responses before and after vaccination to gain insight in the antigenic composition of ETEC that children in Zambia are exposed to and to see whether ETVAX® provides a level of cross-protection against antigens not expressed in the vaccine. The study shows that ETVAX® containing CFA/1, elicits antibodies that cross-react with other class 5 fimbriae and has the potential to offer broad protection. We also see that other antigens apart from classical antigens are immunodominant and possibly play a role in ETEC pathogenesis and may need to be investigated for their role in protection
2023-05-31 | GSE220814 | GEO
Project description:Background Compelling evidence indicates that Shigella species, the etiologic agents of bacillary dysentery, as well as enteroinvasive Escherichia coli, are derived from multiple origins of Escherichia coli and form a single pathovar. To further understand the genome diversity and virulence evolution of Shigella, comparative genomic hybridization microarray analysis was employed to compare the gene content of E. coli K-12 with those of 43 Shigella strains from all serotypes. Results For the 43 strains subjected to CGH microarray analyses, the common backbone of the Shigella genome was estimated to contain more than 1,900 open reading frames, with a mean number of 729 undetectable ORFs. The mosaic distribution of absent regions indicated that insertions and/or deletions have led to the highly diversified genomes of pathogenic strains. Conclusion These results support the hypothesis that by gain and loss of functions, Shigella species became successful human pathogens through convergent evolution from diverse genomic backgrounds. Moreover, we also found many specific differences between different lineages, providing a window into understanding bacterial speciation and taxonomic relationships. Keywords: comparative genomic hybridization
2007-07-01 | GSE5212 | GEO
Project description:Patients with advanced microsatellite unstable (MSI-H) colorectal cancer will be vaccinated with three so called frame shift peptides (FSPs), AIM2(-1), HT001(-1) and TAF1B(-1) combined with Montanide ISA-51 VG. By this, an immune response directed against MSI-induced FSPs that are shared by the majority of MSI-H colorectal cancers can be induced. The aim is to show that vaccination against MSI-induced FSPs is safe and can induce or enhance immune responses against MSI-H colorectal cancer-associated antigens.
| 2114862 | ecrin-mdr-crc
Project description:ETEC is an important human pathogen. Although the mechanism of diarrhea is known in ETEC, the regulatory networks are less understood. This study was conducted to understand the global expression of ETEC isolate E24377A under different growth and environemental conditions. ETEC isolate E24377A was grown in the presence of several chemical signals, including bile salts, glucose, and pre-conditioned media (PCM) from other enteric pathogens. E24377A was also grown to different densities, to see if a quorum sensing mechanism was in place
2012-03-01 | GSE31804 | GEO
Project description:to analyse the transcriptomic response of human intestinal tissue engrafted in SCID mice to Shigella infection Keywords: infection, Shigella, gene expression, intestinal cell
2008-06-23 | GSE8636 | GEO
Project description:Shigella flexneri is historically regarded as the primary agent of bacillary dysentery, yet the closely-related Shigella sonnei is replacing S. flexneri, especially in developing countries. The underlying reasons for this dramatic shift are mostly unknown. Using a zebrafish (Danio rerio) model of Shigella infection, we discover that S. sonnei is more virulent than S. flexneri in vivo. Whole animal dual-RNAseq and testing of bacterial mutants suggest that S. sonnei virulence depends on its O-antigen oligosaccharide (which is unique among Shigella species). We show in vivo using zebrafish and ex vivo using human neutrophils that S. sonnei O-antigen can mediate neutrophil tolerance. Consistent with this, we demonstrate that O-antigen enables S. sonnei to resist phagolysosome acidification and promotes neutrophil cell death. Chemical inhibition or promotion of phagolysosome maturation respectively decreases and increases neutrophil control of S. sonnei and zebrafish survival. Strikingly, larvae primed with a sublethal dose of S. sonnei are protected against a secondary lethal dose of S. sonnei in an O-antigen-dependent manner, indicating that exposure to O-antigen can train the innate immune system against S. sonnei. Collectively, these findings reveal O-antigen as an important therapeutic target against bacillary dysentery, and may explain the rapidly increasing S. sonnei burden in developing countries.
2019-11-19 | GSE140544 | GEO
Project description:ETEC is an important human pathogen. Although the mechanism of diarrhea is known in ETEC, the regulatory networks are less understood. This study was conducted to understand the global expression of ETEC isolate E24377A under different growth and environemental conditions. ETEC isolate E24377A was grown in the presence of several chemical signals, including bile salts, glucose, and pre-conditioned media (PCM) from other enteric pathogens. E24377A was also grown to different densities, to see if a quorum sensing mechanism was in place The isolate was grown in different types of media, with different ammendments, and at different growth densities. The overall goal was to determine how expression gene expression changes in the presence of chemical signals; a special emphasis was placed on the expression of known and suspected virulence and colonization factors
2012-03-01 | E-GEOD-31804 | biostudies-arrayexpress
Project description:To better understand the molecular effects of Enterotoxigenic Escherichia coli (ETEC) F4ab/ac infection, we performed a genome-wide comparison of the changes in DNA methylation in ETEC F4ab/ac infected porcine intestinal epithelial cells. Our data provides further insight into the epigenetic alterations of ETEC F4ab/ac infected porcine intestinal epithelial cells and may advance the identification of biomarkers and drug targets for predicting susceptibility to and controlling ETEC F4ab/ac induced diarrhea.
2020-04-06 | GSE143661 | GEO
Project description:PFGRC has developed a cost effective alternative to complete genome sequencing in order to study the genetic differences between closely related species and/or strains. The comparative genomics approach combines Gene Discovery (GD) and Comparative Genomic Hybridization (CGH) techniques, resulting in the design and production of species microarrays that represent the diversity of a species beyond just the sequenced reference strain(s) used in the initial microarray design. These species arrays may then be used to interrogate hundreds of closely related strains in order to further unravel their evolutionary relationships. Infectious diarrhea is a leading worldwide cause of infant mortality and secondary malnutrition. Enterotoxigenic E. coli (ETEC) is a principal etiology of travelers?diarrhea and a major endemic health threat, especially among children in developing nations where it is estimated to cause hundreds of thousands of deaths each year. Vaccine development for ETEC has been significantly hampered by the remarkable genetic plasticity of E. coli, a comparatively modest understanding of the basic pathogenesis of these organisms, and an uncertainty regarding the degree to which any given antigenic target might be conserved. While experimental and epidemiologic data suggest that a broadly protective vaccine can be achieved, this will most effectively be accomplished in a research environment that fosters sharing of vital resources and open, collaborative interactions among multiple investigators. The proposed project is aimed at providing critical leverage to ongoing international investigative efforts pertaining to ETEC pathogenesis and vaccinology. The flow of genetic information within this group motivated us to identify novel genes for the purpose of creating a species DNA microarray to better understand the ancestral relationships among its members. Based on preliminary MLST genotyping, 11 diverse ETEC strains were selected for sequencing. Sequence information obtained from this project, and from other publicly available sources, led to the development of a comprehensive species microarray for ETEC group members. The availability of the ETEC species DNA microarray has allowed us to carry out a collaborative CGH genotyping project to validate this microarray as well as understand the phylogenomic relationships among members of ETEC group.
2010-12-07 | GSE25601 | GEO
Project description:Enterotoxigenic Escherichia coli (ETEC) infections are a common cause of diarrheal illness in low- and middle-income countries. The live-attenuated ACE527 vaccine, adjuvanted with double mutant LT (dmLT), affords clear but partial protection against ETEC challenge inhuman volunteers. Comparatively, initial wild-type ETEC challenge completely protects against severe diarrhea on homologous re-challenge...To investigate molecular determinants of protection, vaccine antigen content was compared to wild-type ETEC, and proteome microarrays were used to assess immune responses following vaccination and ETEC challenge... Although molecular interrogation of the vaccine confirmed expression of targeted canonical antigens, relative to wild-type ETEC, vaccine strains were deficient in production of flagellar antigens, immotile, and lacked production of the EtpA adhesin. Similarly, vaccination ± dmLT elicited responses to targeted canonical antigens, but relative to wild-type challenge, vaccine responses to some potentially protective non-canonical antigens including EtpA were diminished or absent...These studies highlight important differences in vaccine and wild-type ETEC antigen content and call attention to distinct immunologic signatures that could inform investigation of correlates of protection, and guide vaccine antigen selection for these pathogens of global importance.
2019-07-25 | GSE134792 | GEO