Abstract
The arthropod body plan is comprised of several repeating segments along the anteroposterior body axis. This high degree of conservation, however, obfuscates the wide degree of underlying developmental variation present across and within arthropod groups. In chelicerates, the arthropod clade containing mites, spiders, scorpions, and horseshoe crabs, development is the most similar at the stages following early germ band segmentation. Comparative studies of chelicerate segmentation prior to these events, however, remain scarce. In order to elucidate and identify possible shared and derived aspects of chelicerate segmentation, we followed the early prosomal (anterior) segmentation in the model mite Archegozetes longisetosus using the expression of the conserved segmental marker hedgehog (hh). Our data indicate that the ancestral chelicerate likely utilized the gene hedgehog in a group of cells surrounding the germ disc. We also provide evidence that chelicerate segmentation, albeit via the conserved “short/intermediate germ” mode, progresses differently in the prosoma between Archegozetes and spiders and thus early, anterior segmentation in chelicerates is heterochronic.
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Acknowledgements
We are indebted to Dr. Andreas Jenny at the Albert Einstein College of Medicine for the use of lab facilities during portions of this study.
Funding
This work was funded in part by a National Science Foundation grant DEB-0717389 to RHT, and also in part by the National Science Foundation Evo-Dev-Eco Network RCN (IOS no. 0955517) to AAB.
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RHT and AAB conceived the study. AAB cloned all of the genes followed in this study, and performed the in situ hybridizations and sequence analyses. Both authors participated in writing the manuscript, and both have discussed and approved the final version of the manuscript.
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No ethical approval was needed as A. longisetosus is not subject to any animal care regulations.
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The authors declare that they have no competing interests.
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Communicated by Angelika Stollewerk
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Barnett, A.A., Thomas, R.H. Early segmentation in the mite Archegozetes longisetosus reveals conserved and derived aspects of chelicerate development. Dev Genes Evol 228, 213–217 (2018). https://doi.org/10.1007/s00427-018-0615-x
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DOI: https://doi.org/10.1007/s00427-018-0615-x