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Reconstructing the history of maize streak virus strain : a dispersal to reveal diversification hot spots and its origin in Southern Africa

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Monjane, Aderito L., Harkins, Gordon W., Martin, Darren P., Lemey, Phillipe, Lefeuvre, Pierre, Shepherd, Dionne N., Oluwafemi, Sunday, Simuyandi, Michelo, Zinga, Innocent, Komba, Ephrem K. et al.
(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, Vol.85 (No.18). pp. 9623-9636. doi:10.1128/JVI.00640-11

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Official URL: http://dx.doi.org/10.1128/JVI.00640-11

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Abstract

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.

Item Type: Journal Article
Subjects: Q Science > QR Microbiology > QR355 Virology
S Agriculture > SB Plant culture
Divisions: Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Library of Congress Subject Headings (LCSH): Corn -- Virus diseases, Wheat -- Virus diseases, Corn -- Diseases and pests -- Africa, Mosaic viruses, Gene expression, Phylogeography, Cicadulina
Journal or Publication Title: Journal of Virology
Publisher: American Society for Microbiology
ISSN: 0022-538X
Official Date: September 2011
Dates:
DateEvent
September 2011Published
Volume: Vol.85
Number: No.18
Page Range: pp. 9623-9636
DOI: 10.1128/JVI.00640-11
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: National Research Foundation (South Africa) (NRF) , University of Cape Town (UCT), Canon Collins Trust (CCT), Carnegie Corporation of New York , Wellcome Trust (London, England), Fonds voor Wetenschappelijk Onderzoek—Vlaanderen [Research Foundation—Flanders] (FWO), GIS Centre de Recherche et de Veille Sanitaire sur les Maladies Emergentes dans l'Ocean Indien (CRVOI), Réunion. Conseil régional
Grant number: PRAO/AIRD/CRVOI/08/03 (CRVOI)

Data sourced from Thomson Reuters' Web of Knowledge

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