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dc.contributor.authorTsagkogeorga, G.
dc.contributor.authorMcGowen, M.
dc.contributor.authorDavies, K.
dc.contributor.authorJarman, Simon
dc.contributor.authorPolanowski, A.
dc.contributor.authorBertelsen, M.
dc.contributor.authorRossiter, S.
dc.identifier.citationTsagkogeorga, G. and McGowen, M. and Davies, K. and Jarman, S. and Polanowski, A. and Bertelsen, M. and Rossiter, S. 2015. A phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals. Royal Society Open Science. 2 (9).

© 2015 The Authors. Recent studies have reported multiple cases of molecular adaptation in cetaceans related to their aquatic abilities. However, none of these has included the hippopotamus, precluding an understanding of whether molecular adaptations in cetaceans occurred before or after they split from their semi-aquatic sister taxa. Here, we obtained new transcriptomes from the hippopotamus and humpback whale, and analysed these together with available data from eight other cetaceans. We identified more than 11?000 orthologous genes and compiled a genome-wide dataset of 6845 coding DNA sequences among 23 mammals, to our knowledge the largest phylogenomic dataset to date for cetaceans. We found positive selection in nine genes on the branch leading to the common ancestor of hippopotamus and whales, and 461 genes in cetaceans compared to 64 in hippopotamus. Functional annotation revealed adaptations in diverse processes, including lipid metabolism, hypoxia, muscle and brain function. By combining these findings with data on protein–protein interactions, we found evidence suggesting clustering among gene products relating to nervous and muscular systems in cetaceans. We found little support for shared ancestral adaptations in the two taxa; most molecular adaptations in extant cetaceans occurred after their split with hippopotamids.

dc.publisherThe Royal Society Publishing
dc.titleA phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals
dc.typeJournal Article
dcterms.source.titleRoyal Society Open Science
curtin.departmentSchool of Molecular and Life Sciences (MLS)
curtin.accessStatusFulltext not available

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