Abstract
Lampreys are a key species to study the evolution of morphological characters at the dawn of Craniates and throughout the evolution of the craniate’s phylum. Here, we review a number of research fields where studies on lampreys have recently brought significant and fundamental insights on the timing and mechanisms of evolution, on the amazing diversification of morphology and on the emergence of novelties among Craniates. We report recent example studies on neural crest, muscle and the acquisition of jaws, where important technical advancements in lamprey developmental biology have been made (morpholino injections, protein-soaked bead applications or even the first transgenesis trials). We describe progress in the understanding and knowledge about lamprey anatomy and physiology (skeleton, immune system and buccal secretion), ecology (life cycle, embryology), phylogeny (genome duplications, monophyly of cyclostomes), paleontology, embryonic development and the beginnings of lamprey genomics. Finally, in a special focus on the nervous system, we describe how changes in signaling, neurogenesis or neuronal migration patterns during brain development may be at the origin of some important differences observed between lamprey and gnathostome brains.
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Acknowledgements
Our work on lamprey is supported by grants from the Scientific Interest Group (GIS) “Génomique Marine” and from the ANR-Neuro “Midline” to SR. We wish to thank Sylvie Mazan as the coordinator of the GIS collaborative grant, and for long term input and fruitful interactions on lamprey evo-devo. We also thank Didier Casane, Claude Thermes, Yves Daubenton, Marc Ekker and Kyle Martin for discussions and collaborations. A special thanks goes to Franck Bourrat, who shared with us his beautiful histological preparations. JO was supported by a doctoral fellowship from the Foundation for Science and Technology of the Portuguese Ministry of Science.
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Osório, J., Rétaux, S. The lamprey in evolutionary studies. Dev Genes Evol 218, 221–235 (2008). https://doi.org/10.1007/s00427-008-0208-1
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DOI: https://doi.org/10.1007/s00427-008-0208-1