H-NS Silences Genes in Salmonella
Author Information
Author(s): Lucchini Sacha, Rowley Gary, Goldberg Martin D, Hurd Douglas, Harrison Marcus, Hinton Jay C. D
Primary Institution: Institute of Food Research, Colney, Norwich, United Kingdom
Hypothesis
H-NS mediates the silencing of laterally acquired genes in bacteria.
Conclusion
H-NS acts as a global gene silencer in Salmonella, preventing the uncontrolled expression of genes acquired through lateral gene transfer.
Supporting Evidence
- H-NS silences the expression of 254 genes in wild-type Salmonella.
- H-NS preferentially binds to AT-rich DNA regions.
- The absence of H-NS leads to uncontrolled expression of pathogenicity islands.
- H-NS binding correlates with the AT-content of DNA.
- H-NS provides a fitness advantage by silencing foreign DNA.
Takeaway
H-NS is a protein that helps bacteria control which genes are turned on or off, especially those that they get from other bacteria. This helps them stay healthy and fit.
Methodology
Chromatin immunoprecipitation on chip (ChIP-on-chip) was used to identify H-NS and RNA polymerase binding sites on the Salmonella chromosome.
Limitations
The study primarily focuses on Salmonella and may not generalize to all bacteria.
Statistical Information
P-Value
p<1 × 10−55
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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