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A DNA structural atlas for Escherichia coli.
A G Pedersen1, L J Jensen, S Brunak
1Center for Biological Sequence Analysis, Department of Biotechnology, The Technical University of Denmark, Building 208, DK-2800 Lyngby, Denmark.
Journal of Molecular Biology
|June 14, 2000
Summary
Computational analysis of 18 prokaryotic genomes reveals distinct DNA structural patterns. DNA structural atlases highlight regions with extreme curvature, low flexibility, and stability, potentially organizing DNA and influencing gene expression.
Area of Science:
- Genomics
- Computational Biology
- Structural Bioinformatics
Background:
- DNA structural features influence genomic organization and function.
- Prokaryotic genomes exhibit diverse structural properties.
- Predicting DNA structure from sequence is crucial for understanding gene regulation.
Purpose of the Study:
- To computationally analyze DNA structural features across 18 prokaryotic genomes.
- To develop and utilize tools for visualizing genome-wide DNA structural properties.
- To identify functionally relevant DNA structural motifs and trends.
Main Methods:
- Computational analysis of DNA curvature, flexibility, and stability models.
- Development of color-coded "structural atlases" for visualizing genomic structural data.
- Statistical analysis and clustering of genes based on DNA structural parameters.
Main Results:
- Escherichia coli chromosome structural values deviate significantly from predictions based on nucleotide composition.
- Identified genome-wide trends in E. coli and Bacillus subtilis, with extreme structural properties in the terminus region.
- Discovered 20 DNA regions with extreme structural properties, potentially acting as topological domain boundaries.
- Observed a consistent trend of increased DNA curvature and decreased flexibility/stability in promoter regions across various genomes.
- Clustering of ribosomal genes suggests a role for DNA structure in the transcription of highly expressed genes.
Conclusions:
- DNA structural atlases are effective tools for discovering novel genomic features.
- Specific DNA structural properties are conserved across distantly related bacteria, indicating biological relevance.
- Extreme DNA structural regions may function as organizational elements within the genome.
- DNA structural properties of promoter regions may facilitate transcription initiation.
- DNA structure could play a role in regulating the transcription of highly expressed genes, such as ribosomal genes.