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A chromosome-scale assembly for 'd'Anjou' pear.

Alan Yocca1, Mary Akinyuwa2, Nick Bailey3

  • 1HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806, USA.

G3 (Bethesda, Md.)
|January 8, 2024
PubMed
Summary
This summary is machine-generated.

A new, high-quality genome assembly for European pear (Pyrus communis) was created. This resource will aid in breeding efforts and understanding the evolution of the Rosaceae family.

Keywords:
PacBio HiFicomparative genomicsgenome assemblyhaplotype phasedwhole-genome duplication

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Area of Science:

  • Plant genomics
  • Crop science
  • Evolutionary biology

Background:

  • Cultivated pear (Pyrus communis) is a significant global crop.
  • Pear domestication is recent, offering potential for genome-assisted breeding.
  • Comparative genomics within the Rosaceae family is crucial for understanding plant evolution.

Purpose of the Study:

  • To generate a fully phased, chromosome-scale genome assembly for European pear ('d'Anjou').
  • To enable genome-assisted breeding and comparative genomic studies in pears.

Main Methods:

  • PacBio HiFi and Dovetail Omni-C sequencing technologies were employed.
  • High-quality DNA sequencing data was used for genome assembly.
  • Bioinformatic analyses were performed for gene annotation and synteny assessment.

Main Results:

  • A phased, chromosome-scale genome assembly of Pyrus communis 'd'Anjou' was successfully generated.
  • The assembly comprises 17 chromosomes, with each haplotype totaling ~540 Mb and a contig N50 of ~14 Mb.
  • High synteny was observed between pear haplotypes and with the apple (Malus domestica) genome.
  • Approximately 45,000 genes were annotated per haplotype, with >90% supported by RNA-seq data.
  • Signatures of a shared whole-genome duplication event between apple and pear were identified, with 57% of 'd'Anjou' genes retained in duplicate.

Conclusions:

  • The phased diploid assembly provides a comprehensive genetic resource for European pear.
  • This genome assembly will facilitate future research in pear genetics, breeding, and evolutionary studies.
  • Phased assemblies are valuable for highly heterozygous crops like pear, capturing the full allelic diversity.