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Related Experiment Videos

Are all fishes ancient polyploids?

Yves Van de Peer1, John S Taylor, Axel Meyer

  • 1Department of Plant Systems Biology, Vlaams Interuniversitair Instituut voor Biotechnologie (VIB), Ghent University, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium. yves.vandepeer@gengenp.rug.ac.be

Journal of Structural and Functional Genomics
|July 3, 2003
PubMed
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Ray-finned fishes possess more genes than tetrapods due to a fish-specific genome duplication event. This ancient whole genome duplication occurred 200-450 million years ago, impacting fish evolution.

Area of Science:

  • Evolutionary biology
  • Genomics
  • Comparative genomics

Background:

  • Euteleost fishes exhibit a higher gene copy number compared to tetrapods.
  • The evolutionary origins of these gene duplications in fish are debated.

Purpose of the Study:

  • To investigate the mechanisms responsible for the increased gene copy number in ray-finned fishes.
  • To test hypotheses including fish-specific genome duplication, increased independent gene duplication rates, or gene loss in tetrapods.

Main Methods:

  • Phylogenetic tree reconstruction using sequence data from multiple vertebrate species.
  • Comparative genomic analysis.

Main Results:

  • Phylogenetic analyses strongly suggest a whole genome duplication event in ray-finned fishes.

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  • This event is estimated to have occurred between 200 and 450 million years ago.
  • Evidence supports a shared ancestral duplication followed by differential gene loss in tetrapods.

    • Conclusions:

    • A major genome duplication event in the ancestor of ray-finned fishes is the most likely explanation for their expanded gene repertoire.
    • This ancient duplication has had significant evolutionary consequences for fish diversification.