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Positional difference and Frequency (PdF) based alignment-free technique for genome sequence comparison.

Sudeshna Dey1, Papri Ghosh1, Subhram Das1

  • 1Computer Science and Engineering, Narula Institute of Technology, Kolkata, India.

Journal of Biomolecular Structure & Dynamics
|October 27, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new alignment-free method for genome comparison using a Positional difference and Frequency (PdF) vector. This approach offers more precise evolutionary relationship analysis for mammals and viruses than previous techniques.

Keywords:
Di-nucleotide representationGenome sequence comparisonalignment-free techniqueevolutionary relationshipphylogenetic tree

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Area of Science:

  • Computational biology
  • Bioinformatics
  • Genomics

Background:

  • Genome sequence comparison is crucial in computational biology for research and scientific applications.
  • Alignment-based methods are often inefficient for large datasets, necessitating alignment-free techniques.
  • Alignment-free methods are gaining popularity for sequence clustering and determining evolutionary relationships.

Purpose of the Study:

  • To introduce a novel alignment-free method for genome sequence comparison.
  • To develop a robust vector descriptor for capturing genome sequence characteristics.
  • To evaluate the effectiveness of the proposed method in constructing phylogenetic trees.

Main Methods:

  • A complete bipartite graph-based Positional difference and Frequency (PdF) vector descriptor was developed.
  • The PdF descriptor utilizes di-nucleotide representation and two parameters: positional difference and frequency.
  • A distance matrix was calculated to construct phylogenetic trees for mammal and virus datasets.

Main Results:

  • The proposed PdF vector descriptor was used to generate 16-dimensional vectors for genome sequences.
  • Phylogenetic trees were constructed using the calculated distance matrix for various datasets.
  • The PdF method demonstrated more precise outcomes compared to established methods like FFP, ClustalW, MEV, PCNV, and FIS.

Conclusions:

  • The proposed alignment-free method using the PdF vector descriptor is effective for genome sequence comparison.
  • The method shows potential for analyzing both equal and unequal length genome datasets.
  • This approach offers a more precise alternative to existing techniques for phylogenetic analysis.