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Lamprey Hox genes and the evolution of jaws

Author

Listed:
  • Yoko Takio

    (Laboratory for Evolutionary Morphology, Center for Developmental Biology
    Graduate School of Science and Technology, Kobe University)

  • Massimo Pasqualetti

    (Institut de Génétique et de Biologie Moleculaire et Cellulaire
    Laboratori di Biologia Cellulare e dello Sviluppo, Università di Pisa)

  • Shigehiro Kuraku

    (Laboratory for Evolutionary Morphology, Center for Developmental Biology)

  • Shigeki Hirano

    (School of Health Sciences, Faculty of Medicine, Niigata University)

  • Filippo M. Rijli

    (Institut de Génétique et de Biologie Moleculaire et Cellulaire)

  • Shigeru Kuratani

    (Laboratory for Evolutionary Morphology, Center for Developmental Biology)

Abstract

Arising from: M. J. Cohn Nature 416, 386–387 (2002). In vertebrates with jaws (gnathostomes), the jaws are formed from the first pharyngeal arch (PA1), which does not express homeobox (Hox) genes. Cohn1 describes expression of the HoxL6 gene in the PA1 of the lamprey Lampetra fluviatilis, a jawless (agnathan) vertebrate, and postulates that a retreat of Hox expression from PA1 might have favoured the evolution of jaws in the gnathostome lineage after the split from agnathans1. Here we examine the distribution of Hox genes in another lamprey species, Lethenteron japonicum, and find that none are expressed in the PA1. We conclude that Cohn's finding is not a general feature within the lamprey group and is therefore unlikely to be related to jawlessness.

Suggested Citation

  • Yoko Takio & Massimo Pasqualetti & Shigehiro Kuraku & Shigeki Hirano & Filippo M. Rijli & Shigeru Kuratani, 2004. "Lamprey Hox genes and the evolution of jaws," Nature, Nature, vol. 429(6989), pages 622-622, May.
    • Handle: RePEc:nat:nature:v:429:y:2004:i:6989:d:10.1038_nature02616
    DOI: 10.1038/nature02616
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