Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Expression data from Staphylococcus aureus ATCC 25923 (antibiotic sensitive) and ATCC 33591 (MRSA)

ABSTRACT: S. aureus ATCC 25923 is performance standard for antimicrobial susceptibility testing. S. aureus ATCC 33591 showed resistance against erytrhromycin, penicillin, and streptomycin. We used microarray to compare RNA expression between sensitive and resistant strain of S. aureus as a preliminary research for MRSA inhibition. S. aureus strains were cultivated in tryptic soy broth at 37℃ for 18hrs and harvested for RNA extraction and hybridization on Affymetrix microarrays.

ORGANISM(S): Staphylococcus aureus

SUBMITTER: Taehoen Lee

PROVIDER: E-GEOD-18289 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Powerful usage of phylogenetically diverse Staphylococcus aureus control strains for detecting multidrug resistance genes in transcriptomics studies.

Ham Jun-Sang JS Lee Seung-Gyu SG Jeong Seok-Geun SG Oh Mi-Hwa MH Kim Dong-Hun DH Lee Taeheon T Lee Bo-Young BY Yoon Sook Hee SH Kim Heebal H

Molecules and cells 20100714 1

Staphylococcus aureus is an important human pathogen responsible for life-threatening septicemia, endocarditis, and toxic shock syndrome. Although positive (MRSA; ATCC 33591) and negative (MSSA; ATCC 25923) control strains have been used for various pathogenesis or assay studies, little is known about the genomic structure of the strains, and there has been little genome-wide expression analysis. Phylogenetic analyses revealed that ATCC 33591 and ATCC 25923 are the most genetically diverse strai ...[more]

PMID: 20652498

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Project description:The opportunistic pathogen, Staphylococcus aureus, encounters a wide variety of fluid shear levels within the human host, which may play a key role in dictating whether this organism adopts a commensal interaction with the host or transitions to cause disease. Using rotating-wall vessel bioreactors to create a physiologically-relevant, low fluid shear environment, S. aureus was evaluated for cellular responses that could impact its colonization and virulence. S. aureus cells grown in a low fluid shear environment initiated a novel attachment-independent biofilm phenotype and were completely encased in extracellular polymeric substances. Compared to controls, low-shear cultured cells displayed slower growth and repressed virulence characteristics, including decreased carotenoid production, increased susceptibility to oxidative stress, and reduced survival in whole blood. Transcriptional whole genome microarray profiling suggested alterations in metabolic pathways. Further genetic expression analysis revealed the down-regulation of the RNA chaperone Hfq, which parallels low fluid shear responses of certain Gram negative organisms. This is the first study to report an Hfq association to fluid shear in a Gram positive organism, suggesting an evolutionarily conserved response to fluid shear among structurally diverse prokaryotes. Collectively, our results suggest S. aureus responds to a low fluid shear environment by initiating a biofilm/colonization phenotype with diminished virulence characteristics, which could lead to insight into key factors influencing the divergence between infection and colonization during initial host pathogen interaction. Genetic expression profiles of Staphylococcus aureus cultured under low fluid shear conditions was compared to control cultures of S. aureus which was cultured in identical hardware in an orientation disrupting the low fluid shear effect. Samples from the same date of culture were compared (control 21:low 21 and control 30: low 30). S. aureus was cultured for 20 hours in either the low fluid shear or control orientated rotating wall vessel (RWV) bioreactor at which point the cells were removed and RNA extracted. At 20 hours, both cultures were in the same stage of growth (stationary phase) and at this point phenotypic differences between control and low fluid shear cultures were noted.

Dataset Information

Expression data from Staphylococcus aureus ATCC 25923 (antibiotic sensitive) and ATCC 33591 (MRSA)

Publications

Powerful usage of phylogenetically diverse Staphylococcus aureus control strains for detecting multidrug resistance genes in transcriptomics studies.

Similar Datasets

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