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Exceptional Symmetry by Genomic Word : A Statistical Analysis.

Vera Afreixo1, João M O S Rodrigues2, Carlos A C Bastos2

  • 1iBiMED-Institute of Biomedicine, IEETA-Institute of Electronic Engineering and Informatics of Aveiro, CIDMA- Center for Research and Development in Mathematics and Applications, Department of Mathematics, University of Aveiro, Campus Universitário de Santiago, Aveiro, Portugal. vera@ua.pt.

Interdisciplinary Sciences, Computational Life Sciences
|November 21, 2016
PubMed
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This study introduces a new method to measure exceptional DNA symmetry, revealing varied symmetry levels across different genomic words and organisms. The findings highlight the nuanced nature of this universal genomic law.

Keywords:
Exceptional symmetryGenomic word analysisMultiple organism comparisonSingle-strand symmetry

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Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • Single-strand DNA symmetry is a proposed universal law in genomes.
  • Exceptional symmetry represents symmetry beyond independence, measurable at various genomic levels.
  • Previous studies identified global exceptional symmetry but noted variations in specific genomic words.

Purpose of the Study:

  • To introduce and evaluate a novel measure for exceptional symmetry effect using symmetric word pairs.
  • To analyze the impact of CG content on exceptional symmetry.
  • To present and compare the exceptional symmetry profile across diverse genomes.

Main Methods:

  • Development of a measure for exceptional symmetry effect by symmetric word pair.
  • Detailed analysis of exceptional symmetry considering CG content.
  • Comparative analysis of exceptional symmetry profiles for 31 genomes (viruses, archaea, bacteria, eukaryotes).

Main Results:

  • Global exceptional symmetry is observed in several species.
  • Significant variations exist in exceptional symmetry levels for different genomic words.
  • The study presents a comprehensive comparison of exceptional symmetry profiles across a wide range of organisms.

Conclusions:

  • The proposed measure effectively evaluates exceptional symmetry by symmetric pairs.
  • Exceptional symmetry is a complex genomic feature that varies significantly within and across species.
  • The exceptional symmetry profile offers a new perspective for understanding genomic organization and evolution.