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Comparative genomics in chicken and Pekin duck using FISH mapping and microarray analysis.

Benjamin M Skinner1, Lindsay B W Robertson, Helen G Tempest

  • 1Department of Biosciences, University of Kent, Canterbury CT2 7NJ, UK.

BMC Genomics
|August 7, 2009
PubMed
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Comparative genomics reveals extensive avian genome conservation between chicken and duck, with identified copy number variants (CNVs) suggesting fewer CNVs in birds than mammals. This aids duck genomics and evolutionary studies.

Area of Science:

  • Comparative genomics
  • Avian genetics
  • Molecular cytogenetics

Background:

  • Availability of chicken genome sequence and resources facilitates interspecies comparative studies.
  • Previous work established a turkey cytogenetic map and analyzed copy number variants (CNVs) in birds.
  • Pekin duck (Anas platyrhynchos) is agriculturally important and avian flu-resistant, making it a key target for comparative genomics.

Purpose of the Study:

  • To construct a molecular cytogenetic map of the Pekin duck genome.
  • To identify chromosomal rearrangements and copy number variants (CNVs) in the duck genome.
  • To compare duck genomic structures with those of chicken and turkey.

Main Methods:

  • Fluorescent in-situ hybridization (FISH) using chicken clones to map the duck genome.

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  • Identification of inter- and intrachromosomal rearrangements.
  • Array comparative genomic hybridization (aCGH) to detect copy number variants (CNVs).

    • Main Results:

    • A detailed molecular cytogenetic map of the duck genome was created using 155 chicken clones.
    • Seven chromosomal rearrangements (1 inter-, 6 intra-) were identified between chicken and duck macrochromosomes.
    • Conserved synteny was observed across all analyzed microchromosomes.
    • 32 CNVs were detected in the duck genome, with 5 overlapping known CNV hotspots between chicken and turkey.

    Conclusions:

    • Avian genomes exhibit significant conservation across macro- and microchromosomes over 90 million years of evolution.
    • The identified CNVs in ducks, compared to chicken and turkey, support hypotheses of fewer CNVs in avian genomes versus mammalian genomes.
    • The study highlights shared "CNV hotspots" between evolutionarily distant avian species, aiding future duck genomics, marker development, and evolutionary research.