Hox genes in sea spiders (Pycnogonida) and the homology of arthropod head segments
Autor: | Michaël Manuel, Jérôme Murienne, Hervé Le Guyader, Céline Clabaut, Muriel Jager |
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Přispěvatelé: | Neurophysique et physiologie du système moteur (NPSM), Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS), Origine, structure et évolution de la biodiversité (OSEB), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Université Paris Descartes - Paris 5 (UPD5) - Centre National de la Recherche Scientifique (CNRS), Origine, structure et évolution de la biodiversité, Centre National de la Recherche Scientifique (CNRS) |
Rok vydání: | 2006 |
Předmět: |
0106 biological sciences
Arthropod head problem [SDV.BID]Life Sciences [q-bio]/Biodiversity 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Genetics Animals Nymphon Sea spider Hox gene Arthropods Phylogeny 030304 developmental biology Homeodomain Proteins 0303 health sciences biology Genes Homeobox Anatomy biology.organism_classification Arthropod mouthparts Horseshoe crab Evolutionary biology Chelicerata Arthropod Head Developmental Biology [SDV.BID] Life Sciences [q-bio]/Biodiversity |
Zdroj: | Development Genes and Evolution Development Genes and Evolution, Springer Verlag, 2006, 216 (7-8), pp.481-491 |
ISSN: | 0949-944X 1432-041X |
Popis: | The pycnogonids (or sea spiders) are an enigmatic group of arthropods, classified in recent phylogenies as a sister-group of either euchelicerates (horseshoe crabs and arachnids), or all other extant arthropods. Because of their bizarre morpho-anatomy, homologies with other arthropod taxa have been difficult to assess. We review the main morphology-based hypotheses of correspondence between anterior segments of pycnogonids, arachnids and mandibulates. In an attempt to provide new relevant data to these controversial issues, we performed a PCR survey of Hox genes in two pycnogonid species, Endeis spinosa and Nymphon gracile, from which we could recover nine and six Hox genes, respectively. Phylogenetic analyses allowed to identify their orthology relationships. The Deformed gene from E. spinosa and the abdominal-A gene from N. gracile exhibit unusual sequence divergence in their homeodomains, which, in the latter case, may be correlated with the extreme reduction of the posterior region in pycnogonids. Expression patterns of two Hox genes (labial and Deformed) in the E. spinosa protonymphon larva are discussed. The anterior boundaries of their expression domains favour homology between sea spider chelifores, euchelicerates chelicerae and mandibulate (first) antennae, in contradistinction with previously proposed alternative schemes such as the protocerebral identity of sea spider chelifores or the absence of a deutocerebrum in chelicerates. In addition, while anatomical and embryological evidences suggest the possibility that the ovigers of sea spiders could be a duplicated pair of pedipalps, the Hox data support them as modified anterior walking legs, consistent with the classical views. |
Databáze: | OpenAIRE |
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