| 1. |
- Fischer, Antje H. L., et al.
(författare)
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ZOONET : perspectives on the evolution of animal form. Meeting report
- 2009
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Ingår i: Journal of Experimental Zoology. - Hoboken, N. J. : Wiley-Blackwell. - 0022-104X .- 1097-010X. ; 312B:7, s. 679-685
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Tidskriftsartikel (refereegranskat)abstract
- What drives evolution? This was one of the main questions raised at the final ZOONET meeting in Budapest, Hungary, in November 2008. The meeting marked the conclusion of ZOONET, an EU-funded Marie-Curie Research Training Network comprising nine research groups from all over Europe (Max Telford, University College London; Michael Akam, University of Cambridge; Detlev Arendt, EMBL Heidelberg; Maria Ina Arnone, Stazione Zoologica Anton Dohrn Napoli; Michalis Averof, IMBB Heraklion; Graham Budd, Uppsala University; Richard Copley, University of Oxford; Wim Damen, University of Cologne; Ernst Wimmer, University of Gottingen). ZOONET meetings and practical courses held during the past four years provided researchers from diverse backgrounds-bioinformatics, phylogenetics, embryology, palaeontology, and developmental and molecular biology-the opportunity to discuss their work under a common umbrella of evolutionary developmental biology (Evo Devo). The Budapest meeting emphasized in-depth discussions of the key concepts defining Evo Devo, and bringing together ZOONET researchers with external speakers who were invited to present their views on the evolution of animal form. The discussion sessions addressed four main topics: the driving forces of evolution, segmentation, fossils and phylogeny, and the future of Evo Devo.
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| 2. |
- Janssen, Ralf, 1975-, et al.
(författare)
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The evolution and expression of panarthropod frizzled genes
- 2015
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Ingår i: Frontiers in Ecology and Evolution. - : Frontiers Media SA. - 2296-701X. ; 3
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Tidskriftsartikel (refereegranskat)abstract
- Wnt signaling regulates many important processes during metazoan development. It has been shown that Wnt ligands represent an ancient diverse family of proteins that likely function in complex signaling landscapes to induce target cells and tissues via receptors including those of the Frizzled family. The four subfamilies of Fz receptors also evolved early in metazoan evolution. To compare with other metazoans and arthropods such as insects, we explored the repertoire of fz genes in three panarthropod species: Parasteatoda tepidariorum, Glomeris marginata and Euperipatoides kanangensis, representing the Chelicerata, Myriapoda and Onychophora respectively. We found that these three diverse panarthropods each have four fz genes with representatives of all four metazoan fz subfamilies found in Glomeris and Euperipatoides while Parasteatoda does not have a fz3 gene but has two fz4 paralogues. Furthermore we characterized the expression patterns of all fz genes in Parasteatoda, Glomeris and Euperipatoides and found both conserved and divergent expression of these genes among these animals and in comparison to insects. Our study provides new insights into the evolution and developmental functions of fz receptors and Wnt signaling more generally.
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| 3. |
- Schwager, Evelyn E., et al.
(författare)
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The house spider genome reveals an ancient whole-genome duplication during arachnid evolution
- 2017
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Ingår i: BMC Biology. - : BIOMED CENTRAL LTD. - 1741-7007. ; 15
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Tidskriftsartikel (refereegranskat)abstract
- Background: The duplication of genes can occur through various mechanisms and is thought to make a major contribution to the evolutionary diversification of organisms. There is increasing evidence for a large-scale duplication of genes in some chelicerate lineages including two rounds of whole genome duplication (WGD) in horseshoe crabs. To investigate this further, we sequenced and analyzed the genome of the common house spider Parasteatoda tepidariorum.Results: We found pervasive duplication of both coding and non-coding genes in this spider, including two clusters of Hox genes. Analysis of synteny conservation across the P. tepidariorum genome suggests that there has been an ancient WGD in spiders. Comparison with the genomes of other chelicerates, including that of the newly sequenced bark scorpion Centruroides sculpturatus, suggests that this event occurred in the common ancestor of spiders and scorpions, and is probably independent of the WGDs in horseshoe crabs. Furthermore, characterization of the sequence and expression of the Hox paralogs in P. tepidariorum suggests that many have been subject to neo-functionalization and/or sub-functionalization since their duplication.Conclusions: Our results reveal that spiders and scorpions are likely the descendants of a polyploid ancestor that lived more than 450 MYA. Given the extensive morphological diversity and ecological adaptations found among these animals, rivaling those of vertebrates, our study of the ancient WGD event in Arachnopulmonata provides a new comparative platform to explore common and divergent evolutionary outcomes of polyploidization events across eukaryotes.
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