Project description:Comparison of expression profiles of strains of Francisella to identify virulence factors We used custom microarrays to detail the global gene expression of four strains of Francisella (Schu4, LVS, OR960246, U112) and identified distinct classes of differentially expressed genes during this process. All the strains of Francisella were grown to optical density of 0.6 in a chemical defined medium and their expression profiles were compared.
Project description:Differential expression in human peripheral blood monocytes between F. novicida-infected and uninfected, and between Francisella tularensis tularensis isolate Schu S4 and uninfected. The goal was to examine genomewide transcriptional reponses to these two strains, and identify differentially-regulated genes that may help explain the virulence of Schu S4. Keywords: Immune Response, Human Monocytes, Bacteria, Francisella Overall design: Human monocytes were infected with the Schu S4 isolate of Francisella tularensis tularensis (n=4), with F. tularensis subspecies novicida isolate U112 (n=4) or were left uninfected (n=6). Gene expression values were calculated using the gcrma package in R and BioConductor, and limma to identify differentially expressed genes. Submitted here are expression values calculated using R 2.7.1 and BioConductor 2.2 (FreeBSD/amd64) but the original were done using R 2.6.1 and BioConductor 2.1 (FreeBSD/amd64). Twelve other chips were pooled with these 14 for preprocessing.
Project description:Francisella tularensis may enter the body thorugh the lungs and cause fatal infection. In this study the inflammatory response to the virulent strain of Francisella (Schu4) was mapped over a 96h time-course using a custom microarray. Overall design: Six groups of 4 mice were exposed to aerosolised Francisella tularensis and a three groups exposed to vehicle only control (media only). Following exposure mice were culled at 4 timepoints (1, 24, 48 and 96h). RNA was extracted and run on the custom array.