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phRAIDER: Pattern-Hunter based Rapid Ab Initio Detection of Elementary Repeats.

Carly E Schaeffer1, Nathaniel D Figueroa1, Xiaolin Liu2

  • 1Department of Computer Science and Software Engineering.

Bioinformatics (Oxford, England)
|June 17, 2016
PubMed
Summary

phRAIDER is a new tool for identifying transposable elements (TEs) and repetitive DNA in genomes. It offers a 10x speedup over existing methods, enabling efficient whole-genome analysis without sacrificing accuracy.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • Transposable elements (TEs) and repetitive DNA constitute a significant portion of eukaryotic genomes.
  • Accurate annotation of TEs is essential for understanding genome structure, organization, and evolution.
  • Existing tools like RepeatMasker and nHMMER require pre-compiled libraries, while de novo tools face limitations in runtime and sensitivity to sequence variations.

Purpose of the Study:

  • To introduce phRAIDER, a novel de novo tool for transposable element (TE) identification.
  • To address the limitations of existing TE identification tools regarding runtime and sensitivity to genomic substitutions.
  • To present a new definition of elementary repeats incorporating the PatternHunter spaced seed model for enhanced detection.

Main Methods:

  • Development of phRAIDER, a de novo TE identification tool.
  • Implementation of a novel elementary repeat definition utilizing the PatternHunter spaced seed model.
  • Evaluation of phRAIDER's performance against established tools like RepeatScout.

Main Results:

  • phRAIDER demonstrates an average 10x speedup compared to RepeatScout on individual human chromosomes.
  • The tool can process the entire human genome in just over three hours.
  • phRAIDER maintains high sensitivity in the presence of genomic substitutions, outperforming other de novo methods.

Conclusions:

  • phRAIDER offers a significant advancement in de novo transposable element identification.
  • Its speed and sensitivity make it suitable for whole-genome analysis.
  • The tool provides an efficient and accurate solution for annotating repetitive DNA in eukaryotic genomes.