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Related Experiment Videos

How repetitive are genomes?

Bernhard Haubold1, Thomas Wiehe

  • 1Department of Biotechnology & Bioinformatics, University of Applied Sciences Weihenstephan, Freising, Germany. bernhard.haubold@fh-weihenstephan.de

BMC Bioinformatics
|December 26, 2006
PubMed
Summary
This summary is machine-generated.

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We introduce a new measure, the index of repetitiveness (Ir), to quantify genome repetitiveness. This method reveals significant differences in repeat content across archaea, eubacteria, and eukaryotes, with the Y chromosome being the most repetitive.

Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Biology

Background:

  • Genome sequences exhibit significant variations in repetitiveness, with underlying causes remaining under investigation.
  • Existing methods for assessing genome repetitiveness are computationally intensive.
  • A novel, efficient measure for genome repetitiveness is needed.

Purpose of the Study:

  • To introduce and validate a novel measure of genome repetitiveness, the index of repetitiveness (Ir).
  • To apply the Ir to a diverse set of 336 genomes across all three domains of life.
  • To analyze the intragenomic distribution of repetitive elements.

Main Methods:

  • Development of the index of repetitiveness (Ir), a computationally efficient measure.
  • Application of Ir to 336 genomes from archaea, eubacteria, and eukaryotes.

Related Experiment Videos

  • Utilizing a sliding window analysis for intragenomic repeat distribution.

    • Main Results:

    • The Ir is zero for random sequences and positive for sequences with excess repeats.
    • Archaea exhibit lower Ir than eubacteria, which have lower Ir than eukaryotes.
    • Mouse chromosomes show higher Ir than human chromosomes; the Y chromosome is the most repetitive.
    • The human HOXA cluster displays local minima in Ir.

    Conclusions:

    • The proposed index of repetitiveness (Ir) is an efficient, scalable measure for genomic analysis.
    • The Ir reveals a wide spectrum of genome repetitiveness across life's domains, consistent with prior findings.
    • Sliding window analysis effectively elucidates the intragenomic distribution of repetitive sequences.