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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of C. difficile following environmental stress

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

INSTRUMENT(S): Anaerobic workstation with airlock

ORGANISM(S): Clostridium difficile

SUBMITTER:

PROVIDER: E-BUGS-55 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Microarray analysis of the transcriptional responses of Clostridium difficile to environmental and antibiotic stress.

Emerson Jenny E JE Stabler Richard A RA Wren Brendan W BW Fairweather Neil F NF

Journal of medical microbiology 20080601 Pt 6

Clostridium difficile is a spore-forming anaerobic bacterium that is an emerging nosocomial threat; incidence of infection in hospitals is increasing, both in frequency and severity, resulting in considerable morbidity and mortality. In order to adapt to the intestinal environment, C. difficile must react to the many stresses involved with colonization, including exposure to antibiotics, which represents the most frequent precipitating agent of C. difficile infection. The responses of C. diffici ...[more]

PMID: 18480334

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Transcription profiling of C. difficile following antibiotic stress

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Project description:Staphylococcus aureus is an important food poisoning bacterium. In food preservation, acidification is a well-known method. Permeant weak organic acids, like lactic and acetic acids, are known to be more effective against bacteria than inorganic strong acids (e.g., HCl). Growth experiments and metabolic and transcriptional analyses were used to determine the responses of a food pathogenic S. aureus strain exposed to lactic acid, acetic acid, and HCl at pH 4.5. Lactic and acetic acid stress induced a slower transcriptional response and large variations in growth patterns compared with the responses induced by HCl. In cultures acidified with lactic acid, the pH of the medium gradually increased to 7.5 during growth, while no such increase was observed for bacteria exposed to acetic acid or HCl. Staphylococcus aureus increased the pH in the medium mainly through accumulation of ammonium and the removal of acid groups, resulting in increased production of diacetyl (2,3-butanedione) and pyrazines. The results showed flexible and versatile responses of S. aureus to different types of acid stress. As measured by growth inhibition, permeant organic acid stress introduced severe stress compared with the stress caused by HCl. Cells exposed to lactic acid showed specific mechanisms of action in addition to sharing many of the mechanisms induced by HCl stress. Data is also available from http://bugs.sgul.ac.uk/E-BUGS-87

2011-04-15 | E-BUGS-87 | biostudies-arrayexpress

Whole-genome comparison of meticillin-resistant Staphylococcus aureus CC22 SCCmecIV from people and their in-contact pets.

Project description:BACKGROUND: Meticillin-resistant Staphylococcus aureus (MRSA) infections remain important medical and veterinary challenges. The MRSA isolated from dogs and cats typically belong to dominant hospital-associated clones, in the UK mostly EMRSA-15 (CC22 SCCmecIV), suggesting original human-to-animal transmission. Nevertheless, little is known about host-specific genetic variation within the same S. aureus lineage. HYPOTHESIS/OBJECTIVES: To identify host-specific variation amongst MRSA CC22 SCCmecIV by comparing isolates from pets with those from in-contact humans using whole-genome microarray. METHODS: Six pairs of MRSA CC22 SCCmecIV from human carriers (owners and veterinary staff) and their respective infected in-contact pets were compared using a 62-strain whole-genome S. aureus microarray (SAM-62). The presence of putative host-specific genes was subsequently determined in a larger number of human (n = 47) and pet isolates (n = 93) by PCR screening. RESULTS: Variation in mobile genetic elements (MGEs) occurred frequently and appeared largE: The variation found amongst MGEs highlights that genetic adaptation in MRSA continues. However, host-specific MGEs were not detected, which supports the hypothesis that pets may not be natural hosts of MRSA CC22 and emphasizes that rigorous hygiene measures are critical to prevent contamination and infection of dogs and cats. The host specificity of individual heavy-metal resistance genes warrants further investigation into different selection pressures in humans and animals.

2013-11-02 | E-BUGS-138 | biostudies-arrayexpress

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

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

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

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2012-10-29 | E-BUGS-128 | biostudies-arrayexpress

Transcription profiling of S. aureus (MRSA) clones with the same USA300 PFGE profile

Project description:Data is also available from http://bugs.sgul.ac.uk/E-BUGS-77

2009-10-12 | E-BUGS-77 | biostudies-arrayexpress