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Molecular evolution and phylogenetic...

Chubb, Alison Leigh.

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Molecular evolution and phylogenetic utility of the ZENK gene in birds.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Molecular evolution and phylogenetic utility of the ZENK gene in birds./
作者:	Chubb, Alison Leigh.
面頁冊數:	107 p.
附註:	Chair: Ned K. Johnson.
Contained By:	Dissertation Abstracts International63-09B.
標題:	Biology, Genetics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063328
ISBN:	0493821880

Molecular evolution and phylogenetic utility of the ZENK gene in birds.
Chubb, Alison Leigh.

Molecular evolution and phylogenetic utility of the ZENK gene in birds. - 107 p.

Chair: Ned K. Johnson.

Thesis (Ph.D.)--University of California, Berkeley, 2002.

The ZENK gene is a single copy nuclear transcription factor in vertebrates that is relatively untested as a phylogenetic marker, despite being intensively studied in birds for its role in vocal learning and production. The goal of this dissertation was twofold: (1) to examine the molecular evolution of ZENK in light of its functional role in avian neurobiology, and (2) to assess the phylogenetic utility of ZENK and its ability to resolve higher-level avian evolutionary history. To test ZENK for molecular adaptation correlated with the evolution of vocal learning in birds, I used a phylogenetic framework and maximum likelihood approach. The results suggest that ZENK did not undergo bouts of directional selection during the acquisition of vocal learning in birds, but rather has experienced stabilizing selection throughout avian history. To then address ZENK's potential as a higher-level phylogenetic marker, I used sequences of 55 avian species to reconstruct an ordinal-level phylogeny. These results indicate that ZENK resolves relationships at the base of the avian tree, confirming the Galloanserae clade, and also at the tips of the tree, confirming the monophyly of many traditional orders. However, the ZENK tree also suggests a rapid radiation of lineages at the interordinal level. Finally, I assessed ZENK's phylogenetic utility below the ordinal level by reconstructing gene trees of the major lineages of passerines, hummingbirds, and swifts, and comparing these three ZENK trees with existing DNA-DNA hybridization trees. The results corroborate many aspects of existing hypotheses and indicate that ZENK is a useful and appropriate marker for higher-level phylogenetic inquiry.

ISBN: 0493821880Subjects--Topical Terms:

1017730
Biology, Genetics.

Molecular evolution and phylogenetic utility of the ZENK gene in birds.
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500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4081.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2002.
520 $a The ZENK gene is a single copy nuclear transcription factor in vertebrates that is relatively untested as a phylogenetic marker, despite being intensively studied in birds for its role in vocal learning and production. The goal of this dissertation was twofold: (1) to examine the molecular evolution of ZENK in light of its functional role in avian neurobiology, and (2) to assess the phylogenetic utility of ZENK and its ability to resolve higher-level avian evolutionary history. To test ZENK for molecular adaptation correlated with the evolution of vocal learning in birds, I used a phylogenetic framework and maximum likelihood approach. The results suggest that ZENK did not undergo bouts of directional selection during the acquisition of vocal learning in birds, but rather has experienced stabilizing selection throughout avian history. To then address ZENK's potential as a higher-level phylogenetic marker, I used sequences of 55 avian species to reconstruct an ordinal-level phylogeny. These results indicate that ZENK resolves relationships at the base of the avian tree, confirming the Galloanserae clade, and also at the tips of the tree, confirming the monophyly of many traditional orders. However, the ZENK tree also suggests a rapid radiation of lineages at the interordinal level. Finally, I assessed ZENK's phylogenetic utility below the ordinal level by reconstructing gene trees of the major lineages of passerines, hummingbirds, and swifts, and comparing these three ZENK trees with existing DNA-DNA hybridization trees. The results corroborate many aspects of existing hypotheses and indicate that ZENK is a useful and appropriate marker for higher-level phylogenetic inquiry.
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