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Molecular Phylogenetics of Mastodon and Tyrannosaurus rex | Science
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Molecular Phylogenetics of Mastodon and Tyrannosaurus rex

Science
25 Apr 2008
Vol 320, Issue 5875
p. 499

Abstract

We report a molecular phylogeny for a nonavian dinosaur, extending our knowledge of trait evolution within nonavian dinosaurs into the macromolecular level of biological organization. Fragments of collagen α1(I) and α2(I) proteins extracted from fossil bones of Tyrannosaurus rex and Mammut americanum (mastodon) were analyzed with a variety of phylogenetic methods. Despite missing sequence data, the mastodon groups with elephant and the T. rex groups with birds, consistent with predictions based on genetic and morphological data for mastodon and on morphological data for T. rex. Our findings suggest that molecular data from long-extinct organisms may have the potential for resolving relationships at critical areas in the vertebrate evolutionary tree that have, so far, been phylogenetically intractable.

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Supplementary Material

File (organ.som.pdf)

References

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Collagen α1(I) and α2(I) protein sequences were obtained by querying the nonredundant all-taxa protein database from the NCBI and through genome alignments at ENSEMBL (www.ensembl.org).
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We thank S.V. Edwards, C. Marshall, C. Balakrishnan, M. Baldwin, P. Brito, N. Hobbs, M. Phillips, S. Nagpal, S. Seymour, G. Poulogiannis, B. Zheng, M. Vander Heiden, J. Horner, N. Myhrvold, and C. Hill for assistance. This research was supported by an NIH National Service Research Award Postdoctoral Fellowship granted to C.L.O., the NSF (awards EAR-0634136 and EAR-0541744), the Paul F. Glenn Foundation, and the David and Lucile Packard Foundation.

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