Evolutionary plasticity of collier function in head development of diverse arthropods
| Autor: | Wim G.M. Damen, Matthias Pechmann, Ernst A. Wimmer, Nina D. Schaeper, Nikola-Michael Prpic |
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| Rok vydání: | 2010 |
| Předmět: |
Insecta
animal structures media_common.quotation_subject Insect Models Biological Evolution Molecular 03 medical and health sciences 0302 clinical medicine Achaearanea Animals Drosophila Proteins Hox gene Arthropods Molecular Biology Hedgehog In Situ Hybridization Phylogeny Body Patterning 030304 developmental biology media_common 0303 health sciences biology fungi Gene Expression Regulation Developmental Cell Biology Anatomy biology.organism_classification engrailed Coleoptera Phenotype Segment polarity gene RNA Interference Chelicerata 030217 neurology & neurosurgery Transcription Factors Developmental Biology Parhyale hawaiensis |
| Zdroj: | Developmental Biology. 344:363-376 |
| ISSN: | 0012-1606 |
| Popis: | The insect intercalary segment represents a small and appendage-less head segment that is homologous to the second antennal segment of Crustacea and the pedipalpal segment in Chelicerata, which are generally referred to as "tritocerebral segment." In Drosophila, the gene collier (col) has an important role for the formation of the intercalary segment. Here we show that in the beetle Tribolium castaneum col is required for the activation of the segment polarity genes hedgehog (hh), engrailed (en) and wingless (wg) in the intercalary segment, and is a regulatory target of the intercalary segment specific Hox gene labial (lab). Loss of Tc col function leads to increased cell death in the intercalary segment. In the milkweed bug Oncopeltus fasciatus, the loss of col function has a more severe effect in lacking the intercalary segment and also affecting the adjacent mandibular and antennal segments. By contrast, col is not expressed early in the second antennal segment in the crustacean Parhyale hawaiensis or in the pedipalpal segment of the spider Achaearanea tepidariorum. This suggests that the early expression of col in a stripe and its role in tritocerebral segment development is insect-specific and might correlate with the appendage-less morphology of the intercalary segment. |
| Databáze: | OpenAIRE |
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