Additional data to: Deep metazoan phylogeny: When different genes tell different stories

Zitation: Nosenko, Tetyana und Schreiber, Fabian und Adamska, Maja und Adamski, Marcin und Eitel, Michael und Hammel, Jörg und Maldonado, Manuel und Müller, Werner und Nickel, Michael und Schierwater, Bernd und Vacelet, Jean und Wiens, Matthias und Wörheide, Gert: Additional data to: Deep metazoan phylogeny: When different genes tell different stories. 15. Januar 2013. Open Data LMU. 10.5282/ubm/data.55

Be­schrei­bung

Molecular phylogenetics resulted in a plethora of controversial hypotheses about the early diversification of non-bilaterian animals. To date, increasing the amount of DNA sequence data analyzed has been insufficient to resolve these relationships unequivocally. To unravel the causes for the patterns of extreme inconsistencies at the base of the metazoan tree of life, we constructed a novel supermatrix containing 122 genes, enriched with new non-bilaterian taxa. Comparative analyses of two non-overlapping multi-gene partitions of this dataset revealed conflicting phylogenetic signals. We show that gene sampling correlates with levels of saturation and Long Branch Attraction artifacts in the two partitions. Additional systematic errors are derived from significant variation in amino acid substitution patterns among metazoan lineages that violate the stationary assumption of models frequently used to reconstruct phylogenies. By modifying gene sampling and taxonomic composition of the outgroup, we were able to construct three different yet well-supported phylogenies. These results show that the accuracy of phylogenetic inference may be improved substantially by selecting genes that evolve slowly across metazoan lineages and applying more realistic substitution models. Additional non sequence-based markers are also necessary to assess the validity of phylogenetic reconstructions.

Keywords

Animal Evolution, non-bilateria, phylogeny, phylogenomics, gene selection

Quelle

Moloecular Phylogenetics and Evolution

• Dokumententyp: Daten
• Name der Kontakt­person: Wörheide, Gert
• E-Mail der Kontaktperson: woerheide at lmu.de
• URL der Kontaktperson: http://www.palmuc.de
• Fakultät: Fakultät für Geowissenschaften
• Dewey Dezimal­klassi­fikation: 500 Naturwissenschaften und Mathematik > 560 Paläontologie ; 500 Naturwissenschaften und Mathematik > 590 Tiere (Zoologie)
• ID-Code: 55
• Hochgeladen von: Prof. Dr. Gert Wörheide
• Hochgeladen am: 29. Jan. 2013 23:09