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Defective or effective? Mutualistic interactions between virus genotypes.

Miguel López-Ferber1, Oihane Simón, Trevor Williams

  • 1Laboratoire de Patologie Comparée, UMR 5087, INRA-CNRS-Universitéde Montpellier II, 30380 Saint Christol-Lez-Ales, France.

Proceedings. Biological Sciences
|November 14, 2003
PubMed
Summary

Defective insect viruses can partner with complete viruses, boosting the overall harm to pests. This viral cooperation enhances transmission and pathogenicity, impacting pest control strategies.

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Area of Science:

  • Virology
  • Insect Pathology
  • Molecular Biology

Background:

  • Defective viruses require complete genotypes for replication and transmission.
  • Defective viruses typically reduce the fitness of complete genotypes.
  • Interactions between viral genotypes can influence population dynamics.

Purpose of the Study:

  • To investigate the interaction between defective and complete baculovirus genotypes.
  • To determine if this interaction affects viral pathogenicity and transmission.
  • To explore the implications for biological insecticide efficacy.

Main Methods:

  • Co-infection experiments using a complete baculovirus and a deletion mutant.
  • Oral transmission assays.
  • Pathogenicity assessments of mixed and single genotype infections.

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Main Results:

  • Mixtures of complete and defective baculovirus genotypes exhibited increased pathogenicity.
  • Mixed genotype infections were more infectious than single genotype infections.
  • Predicted increased transmissibility of mixed genotype occlusion bodies.

Conclusions:

  • A mutualistic interaction exists between baculovirus genotypes, enhancing pathogenicity.
  • This interaction influences viral population dynamics and biological insecticide effectiveness.
  • Frequency-dependent selection will shape these interactions in natural populations.