Evolutionary time-scale of the begomoviruses : evidence from integrated sequences in the Nicotiana genome

Lefeuvre Pierre, Harkins Gordon William, Lett Jean-Michel, Briddon Rob W., Chase Mark W., Moury Benoit, Martin Darren Patrick. 2011. Evolutionary time-scale of the begomoviruses : evidence from integrated sequences in the Nicotiana genome. PloS One, 6 (5):e19193, 10 p.

Quartile : Q1, Sujet : BIOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Résumé : Despite having single stranded DNA genomes that are replicated by host DNA polymerases, viruses in the family Geminiviridae are apparently evolving as rapidly as some RNA viruses. The observed substitution rates of geminiviruses in the genera Begomovirus and Mastrevirus are so high that the entire family could conceivably have originated less than a million years ago (MYA). However, the existence of geminivirus related DNA (GRD) integrated within the genomes of various Nicotiana species suggests that the geminiviruses probably originated >10 MYA. Some have even suggested that a distinct New-World (NW) lineage of begomoviruses may have arisen following the separation by continental drift of African and American proto-begomoviruses ~110 MYA. We evaluate these various geminivirus origin hypotheses using Bayesian coalescent-based approaches to date firstly the Nicotiana GRD integration events, and then the divergence of the NW and Old-World (OW) begomoviruses. Besides rejecting the possibility of a<2 MYA OW-NW begomovirus split, we could also discount that it may have occurred concomitantly with the breakup of Gondwanaland 110 MYA. Although we could only confidently narrow the date of the split down to between 2 and 80 MYA, the most plausible (and best supported) date for the split is between 20 and 30 MYA - a time when global cooling ended the dispersal of temperate species between Asia and North America via the Beringian land bridge.

Mots-clés Agrovoc : Nicotiana, virus des végétaux, évolution, virologie, génétique, phylogénie, begomovirus

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Lefeuvre Pierre, CIRAD-BIOS-UMR PVBMT (REU)
• Harkins Gordon William, University of the Western Cape (ZAF)
• Lett Jean-Michel, CIRAD-BIOS-UMR PVBMT (REU)
• Briddon Rob W., National Institute for Biotechnology and Genetic Engineering (PAK)
• Chase Mark W., Royal Botanic Gardens (GBR)
• Moury Benoit, INRA (FRA)
• Martin Darren Patrick, Institute of Infectious Diseases and Molecular Medicine (ZAF)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/563006/)

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