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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of C. difficile following antibiotic stress

ABSTRACT: Data is also available from http://bugs.sgul.ac.uk/E-BUGS-56

INSTRUMENT(S): Anaerobic workstation with airlock

ORGANISM(S): Clostridium difficile

SUBMITTER:

PROVIDER: E-BUGS-56 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Probing host pathogen cross-talk by transcriptional profiling of both Mycobacterium tuberculosis and infected human dendritic cells and macrophages.

Tailleux Ludovic L Waddell Simon J SJ Pelizzola Mattia M Mortellaro Alessandra A Withers Michael M Tanne Antoine A Castagnoli Paola Ricciardi PR Gicquel Brigitte B Stoker Neil G NG Butcher Philip D PD Foti Maria M Neyrolles Olivier O

PloS one 20080102 1

<h4>Background</h4>Transcriptional profiling using microarrays provides a unique opportunity to decipher host pathogen cross-talk on the global level. Here, for the first time, we have been able to investigate gene expression changes in both Mycobacterium tuberculosis, a major human pathogen, and its human host cells, macrophages and dendritic cells.<h4>Methodology/principal findings</h4>In addition to common responses, we could identify eukaryotic and microbial transcriptional signatures that a ...[more]

PMID: 18167562

Similar Datasets

Transcription profiling of C. difficile following environmental stress

Project description:Data is also available from http://bugs.sgul.ac.uk/E-BUGS-55

2008-11-18 | E-BUGS-55 | biostudies-arrayexpress

Comparative genomic hybridization of 76 Clostridium difficile isolates to investigate clade specificity and microevolution of hypervirulent strains

Project description:Data is also available from http://bugs.sgul.ac.uk/E-BUGS-41

2006-10-04 | E-BUGS-41 | biostudies-arrayexpress

Comparative genomic hybridization of seven strains of Clostridium difficile to investigate genome variability

Project description:Data is also available from http://bugs.sgul.ac.uk/E-BUGS-38

2007-04-04 | E-BUGS-38 | biostudies-arrayexpress

Comparative genomic hybridization of the dominant strains of Mycobacterium tuberculosis in a UK South Asian community

Project description:Data is also available from http://bugs.sgul.ac.uk/E-BUGS-44

2007-09-06 | E-BUGS-44 | biostudies-arrayexpress

Genotyping of Staphylococcus aureus isolates causing gangrenous mastitis versus subclinical mastitis in a dairy sheep flock

Project description:Data is also available from http://bugs.sgul.ac.uk/E-BUGS-76

2009-08-07 | E-BUGS-76 | biostudies-arrayexpress

Transcription profiling by array to assess epidemic methicillin-resistant Staphylococcus aureus 16 phenotypes induced by PBD conjugates

Project description:Objectives Pyrrolobenzodiazepine (PBD) dimers, tethered through inert propyldioxy or pentyldioxy linkers, possess potent bactericidal activity against a range of Gram-positive bacteria by virtue of their capacity to cross-link duplex DNA in sequence-selective fashion. Here we attempt to improve the antibacterial activity and cytotoxicity profile of PBD-containing conjugates by extension of dimer linkers and replacement of one PBD unit with phenyl-substituted or benzo-fused heterocycles that facilitate non-covalent interactions with duplex DNA. Methods DNase I footprinting was used to identify high-affinity DNA binding sites. A staphylococcal gene microarray was used to assess epidemic methicillin-resistant Staphylococcus aureus 16 phenotypes induced by PBD conjugates. Molecular dynamics simulations were employed to investigate the accommodation of compounds within the DNA helix. Results Increasing the length of the linker in PBD dimers led to a progressive reduction in antibacterial activity, but not in their cytotoxic capacity. Complex patterns of DNA binding were noted for extended PBD dimers. Modelling of DNA strand cross-linking by PBD dimers indicated distortion of the helix. A majority (26 of 43) of PBD-biaryl conjugates possessed potent antibacterial activity with little or no helical distortion and a more favourable cytotoxicity profile. Bactericidal activity of PBD-biaryl conjugates was determined by inability to excise covalently bound drug molecules from bacterial duplex DNA. Conclusions PBD-biaryl conjugates have a superior antibacterial profile compared with PBD dimers such as ELB-21. We have identified six PBD-biaryl conjugates as potential drug development candidates. [Data is also available from http://bugs.sgul.ac.uk/E-BUGS-118]

2012-04-17 | E-BUGS-118 | biostudies-arrayexpress

Transcription profiling of S. aureus to investigate an outbreak of severe infections with community-acquired methicillin-resistant Staphylococcus aureus carrying the Panton-Valentine leukocidin following immunization - duplicate of E-BUGS-45

Project description:BACKGROUND: Infections with community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) are emerging worldwide. We investigated an outbreak of severe CA-MRSA infections in children following out-patient vaccination. METHODS AND FINDINGS: We carried out a field investigation after adverse events following immunization (AEFI) were reported. We reviewed the clinical data from all cases. S. aureus recovered from skin infections and from nasal and throat swabs were analyzed by pulse-field gel electrophoresis, multi locus sequence typing, PCR and microarray. In May 2006, nine children presented with AEFI, ranging from fatal toxic shock syndrome, necrotizing soft tissue infection, purulent abscesses, to fever with rash. All had received a vaccination injection in different health centres in one District of Ho Chi Minh City. Eight children had been vaccinated by the same health care worker (HCW). Deficiencies in vaccine quality, storage practices, or preparation and delivery were not found. Infection control practices were insufficient. CA-MRSA was cultured in four children and from nasal and throat swabs from the HCW. Strains from children and HCW were indistinguishable. All carried the Panton-Valentine leukocidine (PVL), the staphylococcal enterotoxin B gene, the gene complex for staphylococcal-cassette-chromosome mec type V, and were sequence type 59. Strain HCM3A is epidemiologically unrelated to a strain of ST59 prevalent in the USA, although they belong to the same lineage. CONCLUSIONS: We describe an outbreak of infections with CA-MRSA in children, transmitted by an asymptomatic colonized HCW during immunization injection. Consistent adherence to injection practice guidelines is needed to prevent CA-MRSA transmission in both in- and outpatient settings. Data is also available from http://bugs.sgul.ac.uk/E-BUGS-45

2009-01-16 | E-BUGS-45 | biostudies-arrayexpress

Genetic Variation in Spatio-Temporal Confined USA300 Community-Associated MRSA Isolates: A Shift from Clonal Dispersion to Genetic Evolution?

Project description:Introduction Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) are increasingly isolated, with USA300-0114 being the predominant clone in the USA. Comparative whole genome sequencing of USA300 isolates collected in 2002, 2003 and 2005 showed a limited number of single nucleotide polymorphisms and regions of difference. This suggests that USA300 has undergone rapid clonal expansion without great genomic diversification. However, whole genome comparison of CA-MRSA has been limited to isolates belonging to USA300. The aim of this study was to compare the genetic repertoire of different CA-MRSA clones with that of HA-MRSA from the USA and Europe through comparative genomic hybridization (CGH) to identify genetic clues that may explain the successful and rapid emergence of CA-MRSA. Materials and Methods Hierarchical clustering based on CGH of 48 MRSA isolates from the community and nosocomial infections from Europe and the USA revealed dispersed clustering of the 19 CA-MRSA isolates. This means that these 19 CA-MRSA isolates do not share a unique genetic make-up. Only the PVL genes were commonly present in all CA-MRSA isolates. However, 10 genes were variably present among 14 USA300 isolates. Most of these genes were present on mobile elements. Conclusion The genetic variation present among the 14 USA300 isolates is remarkable considering the fact that the isolates were recovered within one month and originated from a confined geographic area, suggesting continuous evolution of this clone. Data is also available from <ahref=http://bugs.sgul.ac.uk/E-BUGS-108 target=_blank>BuG@Sbase</a>

2011-04-15 | E-BUGS-108 | biostudies-arrayexpress

The distribution of mobile genetic elements (MGEs) in MRSA CC398 is associated with both host and country.

Project description:Methicillin-resistant Staphylococcus aureus clonal complex (CC) 398 has emerged from pigs to cause human infections in Europe and North America. We used a new 62-strain S. aureus microarray (SAM-62) to compare genomes of isolates from three geographical areas (Belgium, Denmark, and Netherlands) to understand how CC398 colonizes different mammalian hosts. The core genomes of 44 pig isolates and 32 isolates from humans did not vary. However, mobile genetic element (MGE) distribution was variable including SCCmec. Phi3 bacteriophage and human specificity genes (chp, sak, scn) were found in invasive human but not pig isolates. SaPI5 and putative ruminant specificity gene variants (vwb and scn) were common but not pig specific. Virulence and resistance gene carriage was host associated but country specific. We conclude MGE exchange is frequent in CC398 and greatest among populations in close contact. This feature may help determine epidemiological associations among isolates of the same lineage. [Data is also available from http://bugs.sgul.ac.uk/E-BUGS-120]

2012-01-21 | E-BUGS-120 | biostudies-arrayexpress

Staphylococcus aureus CC398 Clade Associated with Human-to-Human Transmission

Project description:Staphylococcus aureus clonal complex 398 (CC398) isolates colonize livestock and can spread to human contacts. Genetic analysis of isolates epidemiologically associated with human-to-human, but not livestock, transmission in multiple countries and continents identified a common clade that was negative for tet(M) and positive for bacteriophage 3. Another group of human-to-human-transmitted isolates belonged to the common livestock-associated clade but had acquired a unique φ7 bacteriophage. [Data is also available from http://bugs.sgul.ac.uk/E-BUGS-124]

2012-10-29 | E-BUGS-124 | biostudies-arrayexpress

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