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A novel canine reference genome resolves genomic architecture and uncovers transcript complexity.

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Summary

A new domestic dog reference genome, GSD_1.0, significantly improves contiguity and reveals hidden functional elements. This enhanced genome assembly aids in identifying trait-associated variations and understanding canine genetics.

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Area of Science:

  • Genomics
  • Canine Genetics
  • Comparative Genomics

Background:

  • The CanFam3.1 reference genome has limitations in contiguity and completeness.
  • Understanding the canine genome is crucial for breed-specific traits and disease research.

Purpose of the Study:

  • To develop a high-quality, contiguous domestic dog reference genome (GSD_1.0).
  • To identify previously hidden functional elements and trait-associated variations.
  • To catalogue canine "dark" regions for improved mapping and variant discovery.

Main Methods:

  • Assembly of the GSD_1.0 reference genome using advanced sequencing technologies.
  • Comprehensive annotation using long and short-read RNA-seq, miRNA-seq, and ATAC-seq data.
  • 10x linked-read sequencing across 27 dogs (19 breeds) for variant discovery.

Main Results:

  • GSD_1.0 exhibits a 55-fold increase in contiguity over CanFam3.1.
  • 32.1% of previously gapped regions in CanFam3.1 contain functional elements in GSD_1.0.
  • Identification of millions of SNPs, indels, and structural variants, with 1.4% impacting protein-coding genes.

Conclusions:

  • GSD_1.0 represents a significant advancement in canine genome reference quality.
  • The new reference genome facilitates the discovery of functional elements and trait-associated genetic variations.
  • This resource will advance research into canine phenotypes, health, and evolution.