Abstract
We studied the occurrence of O-type P elements in at least one species of each subgroup of the saltans group, in order to better understand the phylogenetic relationships among the elements within the saltans group and with those of species belonging to the willistoni group. We found that the O-type subfamily has a patchy distribution within the saltans group (it does not occur in D. neocordata and D. emarginata), low sequence divergence among species of the saltans group as well as in relation to species of the willistoni group, a lower rate of synonymous substitution for coding sequences compared to Adh, and phylogenetic incongruities. These findings suggest that the evolutionary history of the O-type subfamily within the saltans and willistoni groups follows the same model proposed for the canonical subfamily of P elements, i.e., events of horizontal transfer between species of the saltans and willistoni groups.
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Acknowledgments
The authors wish to thank H. E. M. C. Bicudo, J. C. Silva, L. M. Almeida, L. Madi-Ravazzi, V. L. S. V. Gayeski, and W. Pinsker for providing us with strains of Drosophila. This research was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP—Brazil; research grant 03/12545-0 to C.M.A.C.) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq—Brazil). We also thank an anonymous reviewer for critical observations and valuable suggestions for the improvement of the manuscript.
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de Setta, N., Loreto, E.L.S. & Carareto, C.M.A. Is the Evolutionary History of the O-Type P Element in the saltans and willistoni Groups of Drosophila Similar to That of the Canonical P Element?. J Mol Evol 65, 715–724 (2007). https://doi.org/10.1007/s00239-007-9051-7
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DOI: https://doi.org/10.1007/s00239-007-9051-7