Enterohemorrhagic Escherichia coli: impact of short chain fatty acid treatment on virulence gene expression
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ABSTRACT: transcriptome analysis of enterohemorrhagic E. coli treated with either one of two different concentrations of short chain fatty acid mixes or the corresponding sodium chloride osmolarity control four conditions: 30mM SCFA mix; 30mM NaCl control; 172mM SCFA mix: 172 mM NaCl control. Biological replicates: 4 per group
Project description:transcriptome analysis of enterohemorrhagic E. coli treated with either one of two different concentrations of short chain fatty acid mixes or the corresponding sodium chloride osmolarity control
Project description:An experiment to identify the downstream targets of PatE, a prophage encoded AraC-like transcriptional regulator, in transcriptional activation of acid-resistance pathways of enterohemorrhagic Escherichia coli strain EDL933 using deletion and complementation strains (Delta3 and Delta3_1, respectively).
Project description:To identify mediators of the osmotic stress response in Mycobacterium tuberculosis (Mtb), we performed transcriptional profiling of WT CDC1551 following treatment with 140 mM NaCl for 1 hr relative to an untreated control. 140 mM NaCl was chosen to reflect the approximate osmolarity of human plasma (i.e., 280 mOsm/L), which may be relevant during the course of infection.
Project description:The goal of this study was to test the hypothesis that sodium selenite (ISe) vs. a 1:1 blend (MIX) of ISe and SEL-PLEX in a basal vitamin-mineral (VM) mix would differentially alter corpora lutea transcriptome profiles in non-lactating beef cows. Predominately-Angus cows were randomly selected from herds of fall-calving cows consuming VM mixes that contained 35 ppm Se as ISe and MIX forms. Cows were depleted of Se for 45 d followed by a 45 d repletion period with ISe to bring all cows to Se adequate status. Cows were then randomly assigned to treatment (ISe, n=5; or MIX, n=5) with treatments administered for at least 90 days using in-pasture Calan gates. Corpora lutea samples were then collected on Day 7 post-estrus and examined for changes in global expression patterns by microarray analysis.
Project description:To identify mediators of the osmotic stress response in Mycobacterium tuberculosis (Mtb), we performed transcriptional profiling of WT CDC1551 following treatment with 140 mM NaCl for 1 hr relative to an untreated control. 140 mM NaCl was chosen to reflect the approximate osmolarity of human plasma (i.e., 280 mOsm/L), which may be relevant during the course of infection. CDC1551 was treated with 140 mM NaCl for 1 h and compared to the same strain treated with 0 mM NaCl for 0 h. 4 biological replicates, independently grown and harvested. One replicate per array.
Project description:An experiment to identify the downstream targets of PatE, a prophage encoded AraC-like transcriptional regulator, in transcriptional activation of acid-resistance pathways of enterohemorrhagic Escherichia coli strain EDL933 using deletion and complementation strains (Delta3 and Delta3_1, respectively). Incomplete 2 factor with dye swaps. Genotype: 3 levels (wt, detla3, delta3_1) Bicarbonate: 2 levels (pos, neg) on wt only. 4 biological replicates, 2 in each dye orientation. Microarrays processed at Australian Genome Research Facility.
Project description:The goal of this study was to test the hypothesis that sodium selenite (ISe), SEL-PLEX (OSe), vs. a 1:1 blend (MIX) of ISe and OSe in a basal vitamin-mineral (VM) mix would differetianlly alter hepatic transcriptome profiles in growing beef steers commonly grazing an endophyte-infected tall fescue (E+) pasture. Predominately-Angus steers (BW = 183 ± 34 kg) were randomly selected from herds of fall-calving cows grazing E+ pasture and consuming VM mixes that contained 35 ppm Se as ISe, OSe, and MIX forms. Steers were weaned, depleted of Se for 98 d, and subjected to summer-long common grazing of an E+ pasture (0.51 ppm total ergovaline per ergovalinine; 10.1 ha). Steers were assigned (n = 8 per treatment) to the same Se-form treatments upon which they were raised. Selenium treatments were administered by daily top-dressing 85 g of VM mix onto 0.23 kg soyhulls, using in-pasture Calan gates. We collected liver samples and examined for changes in global expression pattern by microarray analysis.
Project description:To test the hypothesis that average daily gain (ADG) and clinical parameters of steers grazing novel non-toxic (NTE) or toxic KY-31 (TE) endophyte-infected tall fescue would be improved by ad libitum intake of vitamin-mineral mixes (V-M) that contain 27 ppm Se as a 1:1 blend of SELPLEX:sodium selenite (MIX) vs. sodium selenite (ISe), 32 fescue-naïve beef steers depleted of Se were randomly assigned to ad libitum consumption ISe vs MIX for 35 d and fed enough of a NTE/alfalfa/grain diet to achieve 0.57 kg BW gain/d. Within Se-form treatments, 2 steers were randomly assigned to each of 4 NTE (ISe = 316 ± 31 kg, MIX = 315 ± 22 kg) or TE (ISe = 316 ± 37 kg, MIX = 314 ± 39 kg) paddocks for 84 d and had ad libitum access to their respective V-M. Steers were slaughtered over a 23-d period from day 90 to day 113 (August 27, 2019 to September 19, 2019) of the study and the left kidney removed.