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- Hallström, BjörnLund University,Lunds universitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science (author)
Gnathostome phylogenomics utilizing lungfish EST sequences.
- Article/chapterEnglish2009
Publisher, publication year, extent ...
- 2008-11-24
- Oxford University Press (OUP),2009
Numbers
- LIBRIS-ID:oai:lup.lub.lu.se:b64186cd-5097-4d76-9133-ddc508122001
- https://lup.lub.lu.se/record/1271162URI
- https://doi.org/10.1093/molbev/msn271DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- The relationship between the Chondrichthyes (cartilaginous fishes), the Actinopterygii (ray-finned fishes) and the piscine Sarcopterygii (lobe-finned fishes), and how the Tetrapoda (four-limbed terrestrial vertebrates) are related to these has been a contentious issue for more than a century. A general consensus about the relationship of these vertebrate clades has gradually emerged among morphologists, but no molecular study has yet provided conclusive evidence for any specific hypothesis. In order to examine these relationships on the basis of more extensive sequence data we have produced almost 1,000,000 base pairs of expressed sequence tags (ESTs) from the African marbled lungfish, Protopterus aethiopicus. This new data set yielded 771 transcribed nuclear sequences that had not been previously described. The lungfish EST sequences were combined with EST data from two cartilaginous fishes and whole genome data from an agnathan, four ray-finned fishes and four tetrapods. Phylogenomic analysis of these data yielded, for the first time, significant maximum likelihood support for a traditional gnathostome tree with a split between the Chondrichthyes and remaining (bone) gnathostomes. Also the sister group relationship between Dipnoi (lungfishes) and Tetrapoda received conclusive support. Previously proposed hypotheses, such as the monophyly of fishes, could be rejected significantly. The divergence time between lungfishes and tetrapods was estimated to 382-390 million years ago by the current data set and six calibration points.
Subject headings and genre
- NATURVETENSKAP Biologi hsv//swe
- NATURAL SCIENCES Biological Sciences hsv//eng
- expressed sequence tags
- molecular dating
- phylogenomics
- Sarcopterygii
- tetrapods
- vertebrate evolution
Added entries (persons, corporate bodies, meetings, titles ...)
- Janke, AxelLund University,Lunds universitet,Molekylär cellbiologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Molecular Cell Biology,Department of Biology,Faculty of Science(Swepub:lu)gen-aja (author)
- Biologiska institutionenNaturvetenskapliga fakulteten (creator_code:org_t)
Related titles
- In:Molecular biology and evolution: Oxford University Press (OUP)26:2, s. 463-4710737-40381537-1719
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