A bistable gene in a deadly bacterium offers a clue on how to overcome it , PgII.

Key Highlights:

• Researchers discovered that the glpD gene in Pseudomonas aeruginosa exhibits bistable expression, impacting its ability to cause disease.
• The glpD gene's expression varies significantly among individual cells, with some showing high expression and others low or none.
• P. aeruginosa strains with the glpD gene removed showed a reduced ability to kill greater wax moth larvae, indicating its role in infection.
• Interaction of P. aeruginosa with mouse immune cells led to higher glpD expression, suggesting a link between gene expression and infection in mammals.

Detailed Insights:

• Bistability in gene expression, where identical cells show different expression levels, might be a survival strategy for adapting to changing environments.
• The glpD gene, though generally a high expression gene, showed unusual variation in transcript counts, suggesting it behaves as a high expression gene in some cells and a low expression gene in others.
• Scientists used a green fluorescent protein (GFP) to track glpD gene expression, observing that only a fraction of cells lit up, and the 'on' state could be passed down through several generations.
• The presence of glycerol increased the number of cells with the glpD gene 'on', which is expected since P. aeruginosa uses this gene to utilize glycerol.
• P. aeruginosa is a deadly pathogen, especially in burn victims, and is known for antibiotic resistance, making understanding its mechanisms crucial.
• Targeting the variability in glpD expression could potentially prevent P. aeruginosa infections in hospitals.

Scientific/Technical Concepts Involved:

• Bistability: The ability of a system to exist in two stable states.
• Gene Expression: The process by which information from a gene is used in the synthesis of a functional gene product.
• Pathogen: A bacterium, virus, or other microorganism that can cause disease.
• RNA Transcript: A single-stranded RNA molecule synthesized from a DNA template during transcription.