Abstract
The functional constraint imposed on exonic sequences increases marker universality and improves sequence alignment accuracy, yet introns have been favoured recently in Avian Tree of Life studies because of the increased sequence coverage that would be required to yield similar resolving power with exons. In this study, we address this shortcoming by developing a pipeline to identify a large number of exonic markers from five avian genomes. Markers were targeted to maximize phylogenetic informativeness and to exclude multi-copy genes. We demonstrate the universality of these markers by testing a portion of them on a taxonomically diverse assemblage of avian specimens.
Zusammenfassung
Einhundert neue Exon-Markergene für Phylogenieuntersuchungen bei Vögeln
Eukaryotische Gene bestehen aus proteincodierenden Exons und nicht-codierenden Introns. Da die Nucleotidsequenzen von Exons funktionellen Zwängen unterliegen, eignen sie sich gut als Markergene, da sie universell sind und sich einfacher alignieren lassen. Bislang wurden eher Intronsequenzen genutzt, so z.B. in “Avian Tree of Life” Untersuchungen, da sie bereits in größerer Menge vorliegen. Ausgehend von fünf Vogelgenomuntersuchungen wurde in dieser Arbeit eine große Anzahl von Exon-Markern identifiziert. Die Markergene wurden unter dem Aspekt ausgesucht, ob sie phylogenetisch informativ sind und nicht in mehrfachen Kopien im Genom vorkommen. 100 Exonmarker wurden anhand einer repräsentativen Auswahl von Vogelarten überprüft, ob die zugehörigen PCR-Primer universell einsetzbar sind.
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Acknowledgments
This work was funded by the Natural Sciences and Engineering Research Council of Canada via a post-doctoral fellowship to KCRK and a grant to AJB. We thank Oliver Haddrath for providing general assistance in the laboratory. All tissue samples were supplied by the Royal Ontario Museum.
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Kerr, K.C.R., Cloutier, A. & Baker, A.J. One hundred new universal exonic markers for birds developed from a genomic pipeline. J Ornithol 155, 561–569 (2014). https://doi.org/10.1007/s10336-014-1041-0
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DOI: https://doi.org/10.1007/s10336-014-1041-0