Related Experiment Videos
The Mycobacterium tuberculosis dosRS two-component system is induced by multiple stresses
S L Kendall1, F Movahedzadeh, S C G Rison
1Department of Pathology and Infectious Diseases, Royal Veterinary College, London NW1 0TU, UK.
Tuberculosis (Edinburgh, Scotland)
|June 23, 2004
Summary
The Mycobacterium tuberculosis dosR gene, crucial for survival under stress, is induced by various conditions like GSNO and ethanol. Its regulation impacts numerous other genes, revealing new survival mechanisms.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- The dosR gene in Mycobacterium tuberculosis is a known regulator involved in the response to hypoxic conditions.
- Understanding dosR gene regulation is critical for developing new therapeutic strategies against tuberculosis.
Purpose of the Study:
- To investigate the induction of the Mycobacterium tuberculosis dosR gene under various stress conditions.
- To identify novel genes regulated by dosR using microarray analysis.
Main Methods:
- Quantitative reverse transcription PCR (RTq-PCR) was used to measure dosR gene expression.
- Microarray analysis was employed to compare gene expression profiles between wild-type and deltadosR mutant strains.
Main Results:
- dosR gene expression was significantly increased by S-nitrosoglutathione (GSNO), ethanol, and hydrogen peroxide (H2O2), but not by heat or cold shock.
- The hspX gene, dependent on dosR, showed induction upon standing cultures and centrifugation.
- Microarray analysis revealed 52 up-regulated and 19 down-regulated genes in wild-type compared to deltadosR strains, including known and novel dosR regulon members.
Conclusions:
- The Mycobacterium tuberculosis dosR gene is responsive to a range of stress conditions beyond hypoxia.
- dosR regulates a broader set of genes than previously understood, offering new targets for intervention.