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Genotype phasing in pedigrees using whole-genome sequence data.

August N Blackburn1,2, Lucy Blondell3, Mark Z Kos1

  • 1Department of Human Genetics and South Texas Diabetes and Obesity Institute, School of Medicine, University of Texas Rio Grande Valley, Brownsville, TX, USA.

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|January 31, 2020
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Summary
This summary is machine-generated.

PULSAR accurately phases genotypes in pedigrees using lineage-specific alleles, even without reference panels. This novel method offers high accuracy and error correction for whole-genome data analysis.

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Area of Science:

  • Genetics
  • Bioinformatics
  • Computational Biology

Background:

  • Accurate haplotype phasing from genotype data is crucial for genetic studies.
  • Existing phasing algorithms often rely on reference panels, which are unavailable for many populations.
  • Efficient and accurate phasing methods for pedigrees are needed, particularly for whole-genome sequence data.

Purpose of the Study:

  • To introduce PULSAR (Phasing Using Lineage Specific Alleles/Rare variants), a novel method for phasing whole-genome sequence data in pedigrees.
  • To evaluate the performance of PULSAR across various pedigree structures and assess its robustness to genotyping errors and missing data.
  • To provide a phasing solution that does not require external reference panels.

Main Methods:

  • Developed PULSAR, a method leveraging lineage-specific alleles and rare variants within pedigrees to infer haplotypes.
  • Utilized simulation studies to test PULSAR's accuracy with diverse pedigree sizes, structures, and genotyping error rates.
  • Compared PULSAR's performance against existing pedigree phasing software.

Main Results:

  • PULSAR achieves >99.9% accuracy in phasing heterozygous genotypes in simulated pedigrees with complete sequencing and realistic error rates.
  • The method demonstrates a low switch error rate, frequently below 10^-4.
  • PULSAR exhibits high accuracy, genotype error correction, imputation capabilities, and computational efficiency.

Conclusions:

  • PULSAR is a highly accurate and efficient method for haplotype phasing in pedigrees using whole-genome sequence data.
  • The method's independence from reference panels is a significant advantage for diverse populations.
  • PULSAR offers a valuable tool for genetic research, capable of error correction and imputation.