Lamprey Hox genes and the evolution of jaws

Yoko Takio (), Massimo Pasqualetti, Shigehiro Kuraku (), Shigeki Hirano, Filippo M. Rijli and Shigeru Kuratani ()
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Yoko Takio: Laboratory for Evolutionary Morphology, Center for Developmental Biology
Massimo Pasqualetti: Institut de Génétique et de Biologie Moleculaire et Cellulaire
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

Nature, 2004, vol. 429, issue 6989, 622-622

Abstract: 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.

Date: 2004
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DOI: 10.1038/nature02616

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