PolyOrigin

PolyOrigin reconstructs haplotypes in connected tetraploid F1 populations with shared parents to enable accurate haplotype-based analyses such as quantitative trait loci (QTL) mapping.

Key Features:

• Novel statistical framework: A statistical framework tailored for connected tetraploid F1 populations with shared parents.
• Parental phasing: Phases parental genotypes using an input genetic or physical map of markers.
• Marker map refinement: Refines the input marker map to improve accuracy prior to offspring haplotype reconstruction.
• Offspring haplotype reconstruction: Reconstructs offspring haplotypes from phased parents and marker information.
• SNP data support: Accepts single nucleotide polymorphism (SNP) data from array-based and sequence-based genotyping.
• Bi-allelic read count input: Uses bi-allelic read counts for sequence-based inputs to reduce genotype calling errors at low sequencing depths.
• Robustness: Demonstrated robustness to errors in input genotypic data and marker maps via extensive simulation studies.
• Population and depth limits: Performs effectively across various mating designs with a minimum of 30 offspring per parent and can handle sequence data with read depths as low as 10x.
• Empirical validation: Validated on an autotetraploid potato dataset employing a 3×3 half-diallel mating design.

Scientific Applications:

• Haplotype-based QTL mapping: Enables haplotype-based quantitative trait loci (QTL) mapping in tetraploid breeding populations.
• Polyploid breeding analysis: Facilitates analysis of genetic diversity and inheritance in polyploid species such as autotetraploid potato.
• Low-depth sequence analysis: Supports genotype and haplotype analysis from low to moderate-depth sequencing by leveraging bi-allelic read counts to reduce calling errors.

Methodology:

Phases parental genotypes using an input genetic or physical marker map, refines the marker map, and reconstructs offspring haplotypes using a statistical framework for connected tetraploid F1 populations; supports bi-allelic read counts as input for sequence-based genotyping.