Reconstructing the history of maize streak virus strain a dispersal to reveal diversification hot spots and its origin in southern Africa
Monjane, A. L., Harkins, G. W., Martin, D. P., Lemey, P., Lefeuvre, P., Shepherd, D. N., Oluwafemi, S., Simuyandi, M., Zinga, I., Komba, E. K., Lakoutene, D. P., Mandakombo, N., Mboukoulida, J., Semballa, S., Tagne, A., Tiendrébéogo, F., Erdmann, J. B., van Antwerpen, T., Owor, B. E., Flett, B., Ramusi, M., Windram, O. P., Syed, R., Lett, J. M., Briddon, R. W., Markham, P. G., Rybicki, E. P., & Varsani, A. (2011) Reconstructing the history of maize streak virus strain a dispersal to reveal diversification hot spots and its origin in southern Africa. Journal of Virology, 85(18), pp. 9623-9636.
Maize streak virus strain A (MSV-A), the causal agent of maize streak disease, is today one of the most serious biotic threats to African food security. Determining where MSV-A originated and how it spread transcontinentally could yield valuable insights into its historical emergence as a crop pathogen. Similarly, determining where the major extant MSV-A lineages arose could identify geographical hot spots of MSV evolution. Here, we use model-based phylogeographic analyses of 353 fully sequenced MSV-A isolates to reconstruct a plausible history of MSV-A movements over the past 150 years. We show that since the probable emergence of MSV-A in southern Africa around 1863, the virus spread transcontinentally at an average rate of 32.5 km/year (95% highest probability density interval, 15.6 to 51.6 km/year). Using distinctive patterns of nucleotide variation caused by 20 unique intra-MSV-A recombination events, we tentatively classified the MSV-A isolates into 24 easily discernible lineages. Despite many of these lineages displaying distinct geographical distributions, it is apparent that almost all have emerged within the past 4 decades from either southern or east-central Africa. Collectively, our results suggest that regular analysis of MSV-A genomes within these diversification hot spots could be used to monitor the emergence of future MSV-A lineages that could affect maize cultivation in Africa. © 2011, American Society for Microbiology.
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|Item Type:||Journal Article|
|Additional Information:||Cited By (since 1996): 6
Export Date: 12 November 2012
|Deposited On:||20 Nov 2012 02:46|
|Last Modified:||29 May 2013 16:54|
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