Abstract
Current models for the evolution of new gene functions after gene duplication presume that the duplication events themselves have no effect on fitness. But those duplications that result in new gene functions are likely to be positively selected from their inception. The evolution of new function may start with the amplification of an existing gene with some level of preadaptation for that function, followed by a period of competitive evolution among the gene copies, resulting in the preservation of the most effective variant and the 'pseudogenization' and eventual loss of the rest.
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Acknowledgements
Early discussions on the parallels between gene and organismal evolution with M. Medina prompted the development of this model. This manuscript was improved by comments from H. Ochman, U. Bergthorsson, R. Baker, J. Morgan, G. Moreno-Hagelsieb and E. Branscomb. The figure was designed with input from M. Posada-Buitrago, Y. Vallès, P. Dehal and E. Alm. I thank F. Kondrashov for constructive review of the manuscript. I also thank the US Department of Energy, Office of Biological and Environmental Research, and the Joint Genome Institute, Department of Evolutionary Genomics, for support during the writing of this paper.
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Francino, M. An adaptive radiation model for the origin of new gene functions. Nat Genet 37, 573–578 (2005). https://doi.org/10.1038/ng1579
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DOI: https://doi.org/10.1038/ng1579
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