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Evolutionary analysis of genetic variation observed in citrus tristeza virus (CTV) after host passage

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Summary.

We have studied the genetic variability in two genes (p18 and p20) from two groups of Citrus tristeza virus (CTV) isolates. One group (isolates T385, T317, T318, and T305) was derived from a Spanish source by successive host passages while the other (isolates T388 and T390) was obtained after aphid transmission from a Japanese source. A total of 274 sequences were obtained for gene p18 and 451 for p20. In the corresponding phylogenetic trees, sequences derived from the severe isolates (T318, T305, and T388) clustered together and separately from those derived from mild or moderate isolates (T385, T317, and T390), regardless of their geographic origin. Hierarchical analyses of molecular variance showed that up to 53% of the total genetic variability in p18 and up to 87% of the variation in p20 could be explained by differences in the pathogenicity features of the isolates. Neutrality tests revealed that different selection forces had been acting between isolates and between genes, with purifying selection being suggested for p18 from isolates T385 and T390 and for p20 from isolates T385, T317, and T388, and balancing selection for p18 from isolates T318, T305, and T388 and for p20 from isolates T318 and T390. Furthermore, several models of codon selection were observed, with purifying selection being the most notable one, compatible with low effective population size of the virus populations resulting from transmission bottlenecks. We found no evidence of recombination playing a significant role during p18 and p20 evolution in these isolates. These results suggest that hosts can be an important evolutionary factor for CTV isolates.

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Authors and Affiliations

  1. Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Universitat de València, Valencia, Spain

    V. Sentandreu, F. González-Candelas & A. Moya

  2. Departament de Biologia, Universitat de les Illes Balears, Palma de Mallorca, Spain

    J. A. Castro

  3. Departamento de Biotecnología, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Madrid, Spain

    M. A. Ayllón

  4. Instituto Valenciano de Investigaciones Agrarias, Moncada, Valencia, Spain

    L. Rubio, J. Guerri & P. Moreno

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  1. V. Sentandreu
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Sentandreu, V., Castro, J., Ayllón, M. et al. Evolutionary analysis of genetic variation observed in citrus tristeza virus (CTV) after host passage. Arch Virol 151, 875–894 (2006). https://doi.org/10.1007/s00705-005-0683-x

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