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Sensitive alignment using paralogous sequence variants improves long-read mapping and variant calling in segmental

Timofey Prodanov1, Vikas Bansal2

  • 1Bioinformatics and Systems Biology Graduate Program, University of California, San Diego, La Jolla, CA 92093, USA.

Nucleic Acids Research
|October 9, 2020
PubMed
Summary
This summary is machine-generated.

DuploMap enhances long-read sequencing accuracy in repetitive human genome regions by using paralogous sequence variants. This method improves mapping in segmental duplications, aiding variant discovery.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • Short-read sequencing technologies have limitations in characterizing repetitive genomic regions.
  • Long-read sequencing offers potential but faces challenges in mapping highly similar segmental duplications.
  • Accurate mapping in these regions is crucial for comprehensive genome analysis.

Purpose of the Study:

  • To develop DuploMap, a probabilistic method for improving long-read mapping accuracy in human segmental duplications.
  • To leverage paralogous sequence variants (PSVs) to distinguish between multiple mapping locations of long reads.
  • To enhance variant calling and genome assembly in complex genomic regions.

Main Methods:

  • Developed DuploMap, a probabilistic algorithm analyzing reads mapped to segmental duplications.
  • Utilized existing long-read aligners (e.g., Minimap2, BLASR) in conjunction with DuploMap.
  • Validated the method on simulated datasets and whole-genome long-read data (PacBio CCS).

Main Results:

  • DuploMap significantly increased the percentage of confidently mapped reads in segmental duplications for multiple aligners (e.g., Minimap2: 74.3-90.6%).
  • An additional 8-21% of reads in segmental duplications were mapped with high confidence compared to Minimap2 alone.
  • DuploMap enabled mapping of an additional 8.9 Mb of DNA, improved variant calling F1 scores, and identified thousands of novel variants.

Conclusions:

  • DuploMap effectively improves long-read mapping accuracy in challenging segmental duplication regions.
  • The method enhances the utility of long-read sequencing for variant discovery and genome characterization.
  • Paralogous sequence variants are valuable for resolving complex repetitive genomic structures.