Pairwise visual comparison of small RNA secondary structures with base pair probabilities

Area of Science:

• Bioinformatics
• Computational Biology
• Structural Biology

Background:

• Traditional RNA secondary structure visualization methods, such as dot-plots and planar graphs, present challenges for simultaneous analysis of base pair probabilities and unique structures.
• Analyzing both base pair binding probabilities and minimum free energy structures concurrently is difficult with existing visualization techniques.

Purpose of the Study:

• To introduce a novel, compact, and unified visualization method for RNA secondary structures and their base pair probabilities.
• To develop a user-friendly web server for comparing RNA and DNA sequences using the new visualization tool.

Main Methods:

• Development of the Circular Secondary Structure Base Pairs Probabilities Plot (CS2BP2-Plot) for unified visualization.
• Implementation of a web server utilizing RNAfold for structure/probability calculations and VARNA for diagram generation.
• Integration of ClustalW for local alignments and highlighting nucleotide differences.

Main Results:

• The CS2BP2-Plot effectively integrates RNA secondary structure and base pair probabilities into a single graphical representation.
• The web server facilitates pairwise comparison of up to 10 short RNA/DNA sequences (up to 200 bp).
• The tool provides comparative views including CS2BP2-Plots, traditional diagrams, dot-bracket representations, and sequence alignments.

Conclusions:

• The CS2BP2-Plot offers a single-image solution that replaces dual representations (dot-plots and MFE structures) for RNA secondary structure analysis.
• The developed web server provides an intuitive tool for efficient exploration and comparison of RNA conformations, particularly beneficial for biological research.
• The CS2BP2-Plot enhances visualization and analysis of non-coding RNA (ncRNA) structures.