Project description:Transcriptional profiling of M.tuberculosis to 10 mM vitamin C at 8 h. This was compared to gene expression profile of untreated M. tuberculosis culture. Organism: Mycobacterium tuberculosis H37Rv, Genotypic Technology designed Custom Mycobacterium tuberculosis H37Rv Whole Genome 8x15k GE Microarray (AMADID-020181)
Project description:Investigation of whole genome gene expression level changes in Mycobacterium tuberculosis treated with the DHFR inhibitor WR99210, compared to untreated cells. The antimycobacterial properties of WR99210 are further described in Gerum, A., Ulmer, J., Jacobus, D., Jensen, N., Sherman, D., and C. Sibley. 2002. Novel Saccharomyces cerevisiae screen identifies WR99210 analogues that inhibit Mycobacterium tuberculosis dihydrofolate reductase. Antimicrob Agents Chemother 46(11):3362-3369 [PMID:12384337]
Project description:Transcription analysis of M-NM-^TpknK mutant (LIX11) versus wild type H37Rv during logarithmic and stationary phase growth. This will elucidate the genes regulated by PknK during transition from logarithmic growth to stationary phase growth. Two color Experiment,Organism: Mycobacterium tuberculosis, Genotypic Technology designed Custom Mycobacterium tuberculosis H37Rv Whole Genome 8x15k GE Microarray (AMADID-26323 and AMADID-23057
Project description:Mycobacterium marinum infection in zebrafish (Danio rerio) has been widely used to study human tuberculosis because the bacteria causing these two diseases are close relatives. We studied the zebrafish immune response to M. marinum infection through a whole-genome level transcriptome analysis. As expected based on the literature, our results showed the induction of genes coding proteins associated to immune signaling, cell migration and acute phase response indicating that the immune response to M. marinum infection in zebrafish is similar than the response to tuberculosis causing Mycobacterium tuberculosis in humans.
Project description:In other bacteria, arginine induces the expression of genes involved in arginine catabolism. This study obtained the identification of genes involved in the arginine metabolism of Mycobacterium tuberculosis. Mycobacterium tuberculosis was cultured with arginine or ammonium chloride as sole nitrogen source. In the log phase of growth, RNA was isolated and whole genome expression was determined. The study contains three biological replicates.
Project description:Currently available model organisms such as Mycobacterium smegmatis and Mycobacterium bovis Bacillus Calmette-Guérin (BCG) have significantly contributed to our understanding of tuberculosis (TB) biology, these models have limitations such as differences in genome size, growth rates and virulence. Attenuated Mycobacterium tuberculosis strains may provide more representative, safer models to study M. tuberculosis biology. For example, the M. tuberculosis ΔleuDΔpanCD double auxotroph, has undergone rigorous in vitro and in vivo safety testing. Like other auxotrophic strains, this has subsequently been approved for use in biosafety level (BSL) 2 facilities. Auxotrophic strains have been assessed as models for drug-resistant M. tuberculosis and for studying latent TB. These offer the potential as safe and useful models, but it is important to understand how well these recapitulate salient features of non-attenuated M. tuberculosis. We therefore performed a comprehensive comparison of M. tuberculosis H37Rv and M. tuberculosis ΔleuDΔpanCD. These strains demonstrated similar in vitro and intra-macrophage replication rates, similar responses to anti-TB agents and whole genome sequence conservation. Shotgun proteomics analysis suggested that M. tuberculosis ΔleuDΔpanCD has an increased propensity to enter a dormant state during acid stress, which has been verified using a dual-fluorescent replication reporter assay. Importantly, infection of human peripheral blood mononuclear cells with the 2 strains elicited comparable cytokine production, demonstrating the suitability of M. tuberculosis ΔleuDΔpanCD for immunological assays. We provide comprehensive evidence to support the judicious use of M. tuberculosis ΔleuDΔpanCD as a safe and suitable model organism for M. tuberculosis research, without the need for a BSL3 facility.
Project description:11 Mycobacterium tuberculosis mutants resistant to D-cycloserine were isolated in the laboratory. Genomic DNA was isolated and whole genomes were sequenced to perform SNP calling and identify possible mutations associated with resistance.
Project description:Transcription analysis of M-NM-^TnarL mutant (LIX75) versus wild type H37Rv during aerobic growth in absence or presence of 5 mM Nitrate, and during hypoxic growth. This will elucidate the regulatory role of NarL response regulator duirng aerobic growth in absence of presence of exogenous nitrate supplemen and during hypoxic growth conditions and help identify genes that require NarL for expression under the three experimental conditions. Two color Experiment,Organism: Mycobacterium tuberculosis, Genotypic Technology designed Custom Mycobacterium tuberculosis H37Rv Whole Genome 8x15k GE Microarray (AMADIDAMADID-23057)