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Structural evolution of Otx genes in craniates.

A Germot1, G Lecointre, J L Plouhinec

  • 1Equipe ATIPE de l'UPRES-A 8080 Développement et Evolution, Orsay, France.

Molecular Biology and Evolution
|August 16, 2001
PubMed
Summary

Researchers discovered novel Otx genes in ancient fish, revealing evolutionary insights into craniate Otx gene families. These findings suggest a single ancestral gene duplication event predating gnathostome radiation.

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Area of Science:

  • Evolutionary developmental biology
  • Comparative genomics
  • Molecular evolution

Background:

  • Otx genes are crucial developmental regulators in craniates.
  • Understanding Otx gene evolution provides insights into vertebrate diversification.
  • Previous studies characterized Otx genes in various vertebrate lineages.

Purpose of the Study:

  • To identify and characterize novel Otx genes in basal craniate species: reedfish, dogfish, and hagfish.
  • To investigate the evolutionary history and phylogenetic relationships of Otx genes within craniates.
  • To explore structural constraints and potential functional divergence of Otx gene orthology classes.

Main Methods:

  • Degenerate PCR for exhaustive Otx gene searching.
  • Protein sequence determination and phylogenetic analyses.

Related Experiment Videos

  • Site-by-site sequence comparisons of Otx proteins.

    • Main Results:

    • Three novel Otx genes were identified in each of the three species.
    • A conserved tandem duplication of a C-terminal domain was observed in all identified Otx genes.
    • Phylogenetic analyses revealed three gnathostome Otx orthology classes (Otx1, Otx2, and a novel Otx5/Otx5b-related class).
    • Hagfish Otx genes showed distant relationships to gnathostome classes, with one related to Lampetra japonica OtxA.
    • Structural constraints suggest functional specialization of gnathostome Otx classes predates osteichthyan-chondrichthyan split.

    Conclusions:

    • Craniate Otx gene families likely originated from duplications of a single ancestral gene before gnathostome radiation.
    • The Otx5/Otx5b-related class and its mammalian Crx representatives represent a novel evolutionary lineage.
    • Functional diversification of Otx genes occurred early in gnathostome evolution, preceding major vertebrate lineage splits.