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A unified haplotype-based method for accurate and comprehensive variant calling.

Daniel P Cooke1, David C Wedge2, Gerton Lunter3,4

  • 1MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK. dcooke@well.ox.ac.uk.

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|March 30, 2021
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Summary

Octopus is a new variant caller that accurately identifies germline and somatic mutations across various ploidy levels. It offers improved sensitivity and fewer false positives for detecting low-frequency somatic variations in cancer research.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • Existing haplotype-based variant callers are optimized for common germline variations in diploid populations, yielding suboptimal performance in diverse scenarios.
  • There is a need for a versatile variant caller capable of handling complex genomic data, including varying ploidy and somatic mutations.

Purpose of the Study:

  • To introduce Octopus, a novel variant caller designed for accurate genotyping across a range of experimental designs and ploidy levels.
  • To demonstrate Octopus's capability in detecting both germline and somatic variations, including low-frequency mutations.

Main Methods:

  • Development of Octopus, a variant caller employing a polymorphic Bayesian genotyping model.
  • Unified haplotype-aware framework to model sequencing data from diverse experimental designs.
  • Integration of sequencing reads and prior information for phasing genotypes of arbitrary ploidy, including somatic mutations.

Main Results:

  • Octopus accurately calls germline variants (SNVs, indels, microinversions) in individuals.
  • Demonstrated increased sensitivity for low-frequency somatic variation detection using a synthetic tumor dataset.
  • Octopus significantly reduces false positives compared to other variant calling methods.
  • Output of realigned evidence BAM files to facilitate validation and interpretation.

Conclusions:

  • Octopus provides a unified and accurate approach for variant calling in diverse genomic contexts, including cancer research.
  • The tool enhances the detection of challenging somatic mutations with improved precision.
  • Octopus's ability to handle arbitrary ploidy and somatic mutations makes it a valuable tool for complex genomic analyses.