Next Generation Semiconductor Based Sequencing of the Donkey (Equus asinus) Genome Provided Comparative Sequence Data against the Horse Genome and a Few Millions of Single Nucleotide Polymorphisms

PLoS One. 2015 Jul 7;10(7):e0131925. doi: 10.1371/journal.pone.0131925. eCollection 2015.

Abstract

Few studies investigated the donkey (Equus asinus) at the whole genome level so far. Here, we sequenced the genome of two male donkeys using a next generation semiconductor based sequencing platform (the Ion Proton sequencer) and compared obtained sequence information with the available donkey draft genome (and its Illumina reads from which it was originated) and with the EquCab2.0 assembly of the horse genome. Moreover, the Ion Torrent Personal Genome Analyzer was used to sequence reduced representation libraries (RRL) obtained from a DNA pool including donkeys of different breeds (Grigio Siciliano, Ragusano and Martina Franca). The number of next generation sequencing reads aligned with the EquCab2.0 horse genome was larger than those aligned with the draft donkey genome. This was due to the larger N50 for contigs and scaffolds of the horse genome. Nucleotide divergence between E. caballus and E. asinus was estimated to be ~ 0.52-0.57%. Regions with low nucleotide divergence were identified in several autosomal chromosomes and in the whole chromosome X. These regions might be evolutionally important in equids. Comparing Y-chromosome regions we identified variants that could be useful to track donkey paternal lineages. Moreover, about 4.8 million of single nucleotide polymorphisms (SNPs) in the donkey genome were identified and annotated combining sequencing data from Ion Proton (whole genome sequencing) and Ion Torrent (RRL) runs with Illumina reads. A higher density of SNPs was present in regions homologous to horse chromosome 12, in which several studies reported a high frequency of copy number variants. The SNPs we identified constitute a first resource useful to describe variability at the population genomic level in E. asinus and to establish monitoring systems for the conservation of donkey genetic resources.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Comparative Genomic Hybridization
  • Equidae / genetics*
  • Genetic Variation
  • Genome*
  • High-Throughput Nucleotide Sequencing
  • Horses / genetics*
  • Male
  • Polymorphism, Single Nucleotide*
  • Semiconductors
  • Sequence Analysis, DNA
  • X Chromosome
  • Y Chromosome

Associated data

  • BioProject/PRJEB8743
  • BioProject/PRJEB8744

Grants and funding

This study was supported by University of Bologna RFO (Ricerca Fondamentale Orientata), University of Messina, Corfilcarni and PanLab Project PONa3_00166/F1 funds. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.