Molecular evidence for the evolution of ichnoviruses from ascoviruses by symbiogenesis |
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| Authors: | Yves Bigot Sylvie Samain Corinne Augé-Gouillou Brian A Federici |
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| Affiliation: | 1.GICC, UFR des Sciences & Techniques,Université Fran?ois Rabelais de Tours,Tours,FRANCE;2.CNRS, UMR 6239,UFR des Sciences & Techniques,Tours,France;3.CHRU de Tours, Bd Tonnelé,Tours,France;4.GENOSCOPE,Evry,France;5.Department of Entomology & Graduate Programs in Genetics, Microbiology, and Molecular Biology,University of California,Riverside,USA |
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| Abstract: | Background Female endoparasitic ichneumonid wasps inject virus-like particles into their caterpillar hosts to suppress immunity. These particles are classified as ichnovirus virions and resemble ascovirus virions, which are also transmitted by parasitic wasps and attack caterpillars. Ascoviruses replicate DNA and produce virions. Polydnavirus DNA consists of wasp DNA replicated by the wasp from its genome, which also directs particle synthesis. Structural similarities between ascovirus and ichnovirus particles and the biology of their transmission suggest that ichnoviruses evolved from ascoviruses, although molecular evidence for this hypothesis is lacking. |
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