Project description:Comparison of Clostridium difficile transcriptome of strain CD630E grown for 10 hours in PY (supplemented with mild concentration of cysteine) versus PYC (PY supplemented with 10 mM of cysteine). Experimental procedure was designed to investigate the influence of cysteine on toxins production and the regulatory network involved.
Project description:Transcriptionnal profiling of C. difficile R20291 strain : a wild type strain, a fliC mutant and a fliC mutant complemented after 14h of growth in PY and a wild type strain and a fliC mutant after 14h of mouse infection in Vivo
Project description:Acidithiobacillus ferrooxidans (A. ferrooxidans) ATCC 23270 is a model bacteria for bioleaching research. Because of the use of extractant in metal extraction industry, A. ferrooxidans needs to cope with the water-organic two-phase system. To get insight into the molecular response of A. ferrooxidans to organic solvent, global gene expression pattern was examined in A. ferrooxidans ATCC 23270 cells subjected to Lix984n (an organic extractant) using the method of whole-genome DNA microarray. The data suggested that the global response of A. ferrooxidans to Lix984n stress was characterized by the up-regulation of genes involved in pentose phosphate pathway, fatty acid and glutamate biosynthesis contrary to the significant down-regulation of the majority motility-related genes. In further study, compared to heterotrophic bacteria in dealing with short-time stress, A. ferrooxidans has a special strategy of continuously enhancing the expression of genes encoding proteins involved in electron transport, such as petI, petII, cyo and cyd. Besides, acrAB-tolC operon encoding organic solvent efflux pump and its positive regulator gene ostR were addressed.
