Although parasite–host co-speciation is a long-held hypothesis, convincing evidence for long-term co-speciation remains elusive, largely because of small numbers of hosts and parasites studied and uncertainty over rates of evolutionary change1,2,3,4,5. Co-speciation is especially rare in RNA viruses, in which cross-species transfer is the dominant mode of evolution6,7,8,9. Simian foamy viruses (SFVs) are ubiquitous, non-pathogenic retroviruses that infect all primates10,11. Here we test the co-speciation hypothesis in SFVs and their primate hosts by comparing the phylogenies of SFV polymerase and mitochondrial cytochrome oxidase subunit II from African and Asian monkeys and apes. The phylogenetic trees were remarkably congruent in both branching order and divergence times, strongly supporting co-speciation. Molecular clock calibrations revealed an extremely low rate of SFV evolution, 1.7 × 10-8 substitutions per site per year, making it the slowest-evolving RNA virus documented so far. These results indicate that SFVs might have co-speciated with Old World primates for at least 30 million years, making them the oldest known vertebrate RNA viruses.
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We thank the veterinary staff at all zoological gardens and primate centres who kindly provided blood specimens from the primates living at their institutions; R. Heberle and P. Johnston for the SFV-infected baboon and orangutan isolates; A. Hussain and A. Wright for expert technical assistance; and A. Vandamme, C. Coulibaly, M. Peeters, F. Bibollet-Ruche, V. Hirsch, J. Allan, T. Butler and H. McClure for providing additional primate samples for this study.
The authors declare that they have no competing financial interests.
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Switzer, W., Salemi, M., Shanmugam, V. et al. Ancient co-speciation of simian foamy viruses and primates. Nature 434, 376–380 (2005). https://doi.org/10.1038/nature03341
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