Unknown,Transcriptomics,Genomics,Proteomics

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Functional Genomics Reveals Extended Roles of the Mycobacterium tuberculosis Stress Response Factor sigmaH

ABSTRACT: DNA Microarray based comparison of M. tuberculosis and its isogenic delta-sigmaH mutant for an extended period of time, using a diamide-stress and removal strategy (post-diamide stress or PDS) Raw data has been requested of, but not provided by, the submitter. Two strains, M. tuberculosis vs delta-sigmaH mutant. At Pre-diamide (control), 0' 30' 60' 90' and 120' post-diamide stress, two biological replicates, six replicates per array

ORGANISM(S): Mycobacterium tuberculosis

SUBMITTER: Deepak Kaushal

PROVIDER: E-GEOD-15608 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Functional genomics reveals extended roles of the Mycobacterium tuberculosis stress response factor sigmaH.

Mehra Smriti S Kaushal Deepak D

Journal of bacteriology 20090417 12

Mycobacterium tuberculosis is one of the most successful pathogens of humankind. During infection, M. tuberculosis must cope with and survive against a variety of different environmental conditions. Sigma factors likely facilitate the modulation of the pathogen's gene expression in response to changes in its extracellular milieu during infection. sigma(H), an alternate sigma factor encoded by the M. tuberculosis genome, is induced by thiol-oxidative stress, heat shock, and phagocytosis. In respo ...[more]

PMID: 19376862

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Project description:Trypanosoma cruzi is an organism highly resistant to ionizing radiation. Following a dose of 500 Gy of gamma radiation, the fragmented genomic DNA is gradually reconstructed and the pattern of chromosomal bands is restored in less than 48 hours. Cell growth arrests after irradiation but, while DNA is completely fragmented, RNA maintains its integrity. In this work we compared the transcriptional profiles of irradiated and non-irradiated epimastigotes at different time points after irradiation using microarray. In total, 273 genes were differentially expressed; from these, 160 were up-regulated and 113 down-regulated. We found that genes with predicted functions are the most prevalent in the down-regulated gene category. Translation and protein metabolic processes, as well as generation of precursor of metabolites and energy pathways were affected. In contrast, the up-regulated category was mainly composed of obsolete sequences (which included some genes of the kinetoplast DNA), genes coding for hypothetical proteins, and Retrotransposon Hot Spot genes. Finally, the tyrosyl-DNA phosphodiesterase 1, a gene involved in double-strand DNA break repair process, was up-regulated. Our study demonstrated the peculiar response to ionizing radiation, raising questions about how this organism changes its gene expression to manage such a harmful stress. To evaluate the gamma radiation effect on T. cruzi epimastigote cells, two identical and independent experiments (biological replicates) were performed in triplicate. Each triplicate was composed of seven samples: cell culture growth control (not used in the microarray experiments), non-irradiated cells (used as reference sample in the microarray analysis), and five irradiated samples that had their RNA extracted immediately after irradiation (or i.a.i.), at 4, 24, 48, and 96 hours post-irradiation. Triplicates were pooled after the RNA extraction and before the purification/amplification steps. Each pool corresponding to one of the five time points was hybridized twice against the reference pool from each experiment, applying a reference time-course dye-swap design. Thus, four microarray slides for each time point were produced, two for each biological replicate, totaling 20 slides.

Dataset Information

Functional Genomics Reveals Extended Roles of the Mycobacterium tuberculosis Stress Response Factor sigmaH

Publications

Functional genomics reveals extended roles of the Mycobacterium tuberculosis stress response factor sigmaH.

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