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14:06
Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
Published on: November 12, 2012
Gene clusters reflecting macrodomain structure respond to nucleoid perturbations.
Vittore F Scolari1, Bruno Bassetti, Bianca Sclavi
1Genomic Physics Group, FRE 3214 CNRS Microorganism Genomics, France.
Molecular Biosystems
|December 18, 2010
Summary
DNA-bridging nucleoid proteins like Fis and H-NS influence gene expression by organizing the bacterial chromosome. Specific gene clusters linked to motility and biofilm formation are regulated by this spatial organization.
Area of Science:
- Microbiology
- Molecular Biology
- Genomics
Background:
- Bacterial chromosomal spatial organization is crucial for global gene regulation.
- Nucleoid-structuring proteins, such as Fis and H-NS, play a key role in DNA organization.
- Understanding the interplay between DNA topology and protein occupancy is essential for deciphering gene expression control.
Purpose of the Study:
- To investigate the relationship between chromosomal spatial organization and global transcriptional regulation.
- To identify genomic regions sensitive to nucleoid perturbations.
- To explore the role of nucleoid proteins in coordinating gene expression for lifestyle transitions.
Main Methods:
- Integration of experimental and bioinformatic data.
- Novel multi-scale spatial aggregation analysis of the bacterial genome.
- Analysis of nucleoid-perturbation sensitive gene clusters and their correlation with genome macrodomains.
Main Results:
- Discovery of contiguous clusters of nucleoid-perturbation sensitive genes.
- Gene cluster expression is influenced by DNA topological state and nucleoid protein occupancy.
- Significant clusters located at the Ter macrodomain edges, encompassing flagellar, chemotaxis, and biofilm formation genes.
Conclusions:
- Nucleoid protein-mediated regulation of chromosome structure is vital for coordinating gene expression.
- This regulation facilitates the coordinated transcriptional response required for switching between motile and biofilm lifestyles.
- The findings highlight a direct link between physical chromosome organization and adaptive physiological states.
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