Twist-DNA: computing base-pair and bubble opening probabilities in genomic superhelical DNA

Area of Science:

• Genomics
• Molecular Biology
• Biophysics

Background:

• DNA double helix opening is essential for numerous biological processes.
• In vivo DNA superhelicity, controlled by protein machinery, influences DNA opening.
• Superhelical destabilization sites correlate with genomic regulatory regions.

Purpose of the Study:

• To develop a computational tool for predicting DNA double helix opening.
• To identify regions of superhelically destabilized DNA in the genome.
• To facilitate comparison of DNA opening properties with other genomic datasets.

Main Methods:

• Developed a program based on a thermodynamic model of superhelical DNA (Benham model).
• Employs a self-consistent linearization approach for efficient computation.
• Calculates base-pair and bubble opening probabilities in genomic DNA.

Main Results:

• Successfully predicted locations of superhelically destabilized regions in genomic DNA.
• The program efficiently computes DNA opening probabilities.
• Results can be visualized in standard genome browsers.

Conclusions:

• Local DNA double helix opening is a key aspect of fundamental biological processes.
• Superhelicity, modulated by protein machinery, controls DNA opening.
• The developed program aids in understanding genomic regulatory site organization through DNA opening properties.