title: Defective or effective? Mutualistic interactions between virus genotypes.
abstract: Defective viruses lack genes essential for survival but they can co-infect with complete virus genotypes and use gene products from the complete genotype for their replication and transmission. As such, they are detrimental to the fitness of complete genotypes. Here, we describe a mutualistic interaction between genotypes of an insect baculovirus (nucleopolyhedrovirus of Spodoptera frugiperda (Lepidoptera)) that increases the pathogenicity of the viral population. Mixtures of a complete genotype able to be transmitted orally and a deletion mutant unable to be transmitted orally resulted in a phenotype of increased pathogenicity. Because the infectiousness of mixed genotype infections was greater than that of single genotype infections, we predict that the transmissibility of mixed genotype occlusion bodies will be greater than that of any of their single genotype components. Such interactions will be subject to frequency-dependent selection and will influence the impact of these viruses on insect population dynamics and their efficacy as biological insecticides.
authors: Laboratoire de Patologie Comparée, UMR 5087, INRA-CNRS-Universitéde Montpellier II, 30380 Saint Christol-Lez-Ales, France.
authors: Miguel
authors: M
authors: López-Ferber
authors: Oihane
authors: O
authors: Simón
authors: Trevor
authors: T
authors: Williams
authors: Primitivo
authors: P
authors: Caballero
mesh_terms: D000818:Animals; D004262:DNA Restriction Enzymes; D003673:Defective Viruses / Q000235:genetics*; D004587:Electrophoresis, Agar Gel; D005838:Genotype; D017924:Nucleopolyhedroviruses / Q000235:genetics* / Q000472:pathogenicity*; D016133:Polymerase Chain Reaction; D012641:Selection, Genetic; D018411:Spodoptera / Q000821:virology; D013559:Symbiosis
chemical_list: D004262:DNA Restriction Enzymes