15-P042 Specification of neural precursor identity in the chelicerate Cupiennius salei and the myriapod Glomeris marginata
نویسندگان
چکیده
terning genes) differ as compared to Drosophila (Wheeler etal., 2005). We assume that temporal changes in spatial cues might influence neuroblast identity. This mechanism might have contributed to evolutionary changes in arthropod neurogenesis. We are therefore analysing the expression pattern of homologues of the Drosophila neuroblast identity genes (e.g. segment polarity genes, dorso-ventral patterning genes) during the whole course of neurogenesis in Tribolium.
منابع مشابه
Comparative analysis of neurogenesis in the myriapod Glomeris marginata (Diplopoda) suggests more similarities to chelicerates than to insects.
Molecular data suggest that myriapods are a basal arthropod group and may even be the sister group of chelicerates. To find morphological indications for this relationship we have analysed neurogenesis in the myriapod Glomeris marginata (Diplopoda). We show here that groups of neural precursors, rather than single cells as in insects, invaginate from the ventral neuroectoderm in a manner simila...
متن کاملThe T-box genes H15 and optomotor-blind in the spiders Cupiennius salei, Tegenaria atrica and Achaearanea tepidariorum and the dorsoventral axis of arthropod appendages.
Dorsoventral axis formation in the legs of the fly Drosophila melanogaster requires the T-box genes optomotor-blind (omb) and H15. Evolutionary conservation of the patterning functions of these genes is unclear, because data on H15 expression in the spider Cupiennius salei did not support a general role of H15 in ventral fate specification. However, H15 has a paralogous gene, midline (mid) in D...
متن کاملNeurogenesis in myriapods and chelicerates and its importance for understanding arthropod relationships.
Several alternative hypotheses on the relationships between the major arthropod groups are still being discussed. We reexamine here the chelicerate/myriapod relationship by comparing previously published morphological data on neurogenesis in the euarthropod groups and presenting data on an additional myriapod (Strigamia maritima). Although there are differences in the formation of neural precur...
متن کاملNeurogenesis in the spider: new insights from comparative analysis of morphological processes and gene expression patterns.
While there is a detailed understanding of neurogenesis in insects and partially also in crustaceans, little is known about neurogenesis in chelicerates. In the spider Cupiennius salei Keyserling, 1877 (Chelicerata, Arachnida, Araneae) invaginating cell groups arise sequentially and in a stereotyped pattern comparable to the formation of neuroblasts in Drosophila melanogaster Meigen, 1830 (Inse...
متن کامل15-P044 Comparative analysis of midline guidance and axonal path finding in the chelicerates Cupiennius salei and Achaearanea tepidariorum
terning genes) differ as compared to Drosophila (Wheeler etal., 2005). We assume that temporal changes in spatial cues might influence neuroblast identity. This mechanism might have contributed to evolutionary changes in arthropod neurogenesis. We are therefore analysing the expression pattern of homologues of the Drosophila neuroblast identity genes (e.g. segment polarity genes, dorso-ventral ...
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ورودعنوان ژورنال:
- Mechanisms of Development
دوره 126 شماره
صفحات -
تاریخ انتشار 2009