ABSTRACT: This resulting community model combines the latest available curated GEMs of D. pigrum and S. aureus.
This use-case illustrates how to incorporate genuine GEMs of participating microorganisms and creates a basic community model mimicking the human nasal environment.
Project description:Neutrophil lysis after phagocytosis is a process potentially important in the pathogenesis of community-associated methicillin-resistant S. aureus (CA-MRSA) infection. The mechanism for this process is not currently known. Therefore, to better understand CA-MRSA virulence we used human oligonucleotide microarrays to investigate the mechanism underlying enhanced PMN lysis that occurs after phagocytosis of CA-MRSA. In order to examine the effect of S. aureus on the neutrophil transcriptome and to elucidate any possible differences in this effect between hospital- and community-associated S. aureus, we performed microarray expression analysis on human neutrophils treated with hospital- and community-associated S. aureus.
Project description:Neutrophil lysis after phagocytosis is a process potentially important in the pathogenesis of community-associated methicillin-resistant S. aureus (CA-MRSA) infection. The mechanism for this process is not currently known. Therefore, to better understand CA-MRSA virulence we used human oligonucleotide microarrays to investigate the mechanism underlying enhanced PMN lysis that occurs after phagocytosis of CA-MRSA. In order to examine the effect of S. aureus on the neutrophil transcriptome and to elucidate any possible differences in this effect between hospital- and community-associated S. aureus, we performed microarray expression analysis on human neutrophils treated with hospital- and community-associated S. aureus. Polymorphonuclear leukocytes (PMNs) were isolated from the blood of healthy donors. Control and S. aureus-exposed PMNs were incubated at 37C for 1, 2, 3 or 6 hours.
Project description:It is becoming increasingly apparent that Staphylococcus aureus are able to survive engulfment by macrophages, and that the intracellular environment of these cells, which is essential to innate host defenses against invading microorganisms, may in fact provide a refuge for staphylococcal survival and dissemination. Based on this, we postulated that S. aureus might induce cytoprotective mechanisms by changing gene expression profiles inside macrophages similar to obligate intracellular pathogens, such as Mycobacterium tuberculosis. In order to examine the effect of S. aureus on the macrophage transcriptome, we performed microarray expression analysis on human monocyte-derived macrophages treated with S. aureus. Keywords: time course
Project description:Methicillin-resistant Staphylococcus aureus (MRSA) infections result in more than 200,000 hospitalizations and 10,000 deaths in the United States each year and remain an important medical challenge. To better understand the transcriptome of Staphylococcus aureus USA300 NRS384, a community-acquired MRSA strain, we have conducted an RNA-Seq experiment on WT samples.
Project description:This analysis is part of the study Whole-transcriptome analysis of Staphylococcus aureus under laboratory and infection-mimicking conditions (Mäder, Nicolas et al., to be submitted) where the S. aureus HG001 transcriptome was analyzed under more than 40 different biological conditions. The data revealed a relatively low abundance of antisense RNAs in S. aureus, overlapping only 6% of the coding genes. Transcriptome analysis of the rho deletion mutant revealed a remarkable overall increase in antisense transcription in S. aureus.
Project description:This analysis is part of the study Whole-transcriptome analysis of Staphylococcus aureus under laboratory and infection-mimicking conditions (Mäder, Nicolas et al., to be submitted) where the S. aureus HG001 transcriptome was analyzed under more than 40 different bilogical conditions. Genomic DNA was prepared from four independent cultures of S. aureus HG001 cells; after sonication, DNA was labeled with Cy3 and hybridized to tiling arrays. The data are used in transcriptome studies to compute expression intensities from raw intensity data using a model of shift and drift. genomic DNA from wild type
Project description:This analysis is part of the study Whole-transcriptome analysis of Staphylococcus aureus under laboratory and infection-mimicking conditions (Mäder, Nicolas et al., to be submitted) where the S. aureus HG001 transcriptome was analyzed under more than 40 different biological conditions. The data revealed a relatively low abundance of antisense RNAs in S. aureus, overlapping only 6% of the coding genes. Transcriptome analysis of the rho deletion mutant revealed a remarkable overall increase in antisense transcription in S. aureus. delta rho and wild type
Project description:It is becoming increasingly apparent that Staphylococcus aureus are able to survive engulfment by macrophages, and that the intracellular environment of these cells, which is essential to innate host defenses against invading microorganisms, may in fact provide a refuge for staphylococcal survival and dissemination. Based on this, we postulated that S. aureus might induce cytoprotective mechanisms by changing gene expression profiles inside macrophages similar to obligate intracellular pathogens, such as Mycobacterium tuberculosis. In order to examine the effect of S. aureus on the macrophage transcriptome, we performed microarray expression analysis on human monocyte-derived macrophages treated with S. aureus. Experiment Overall Design: Human monocyte-derived macrophages (hMDMs) were separated from fractions of peripheral blood mononuclear cells (PBMCs) obtained from the blood of healthy donors. Control and S. aureus-exposed macrophages were incubated at 37C for 8, 24, or 48 hours
Project description:This analysis is part of the study Whole-transcriptome analysis of Staphylococcus aureus under laboratory and infection-mimicking conditions (Mäder, Nicolas et al., to be submitted) where the S. aureus HG001 transcriptome was analyzed under more than 40 different bilogical conditions. Genomic DNA was prepared from four independent cultures of S. aureus HG001 cells; after sonication, DNA was labeled with Cy3 and hybridized to tiling arrays. The data are used in transcriptome studies to compute expression intensities from raw intensity data using a model of shift and drift.
Project description:Mastitis in dairy cattle can result from infection by a range of microorganisms but is principally caused by coliform bacteria and gram positive bacteria such as Staphylococcus aureus (S. aureus). The former species are often acquired by environmental contamination while S. aureus is particularly problematic due to its resistance to antibiotic treatments and ability to reside within mammary tissue in a chronic, subclinical state. The transcriptional and translational responses within bovine mammary epithelial tissue subjected to intramammary challenge with S. aureus are poorly characterised, particularly at the earliest stages of infection. A Bovine Innate Immune Microarray was employed to measure changes in gene expression occurring in bovine mammary tissues sampled from three dairy cows after a brief and graded intramammary challenge with a virulent strain of S. aureus. This SuperSeries is composed of the SubSeries listed below.