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Sindbis virus mutants selected for rapid growth in cell culture display attenuated virulence in animals
Abstract:
Mutants of Sindbis virus were selected for rapid growth in baby hamster kidney (BHK) cell cultures and screened for attenuation of virulence in suckling mice. Comparisons among independently isolated virulent and attenuated strains, as well as a classical reversion analysis, showed that accelerated penetration of BHK cells was correlated with attenuation in vivo. Both phenotypic changes resulted from a reorganization of virion structure as detected by monoclonal antibodies. These results suggest that mutants selected for rapid growth in cell culture may be useful as attenuated vaccines and for studies of the molecular basis of virus pathogenesis.
Insights
Sindbis virus mutants grew faster in cell cultures and became less virulent in mice. This suggests rapid cell growth and altered virion structure could lead to effective attenuated vaccines.
Area of Science:
- Virology
- Molecular Biology
- Vaccine Development
Background:
- Sindbis virus is an important model pathogen.
- Understanding virus-host interactions is key to vaccine design.
Purpose of the Study:
- To investigate the relationship between Sindbis virus cell culture growth rate and virulence.
- To explore the potential of cell culture-adapted mutants as attenuated vaccines.
Main Methods:
- Selection of Sindbis virus mutants for enhanced growth in baby hamster kidney (BHK) cells.
- Virulence testing of selected mutants in suckling mice.
- Analysis of virion structure using monoclonal antibodies.
- Classical reversion analysis to confirm genetic linkage of traits.
Main Results:
- Mutants with accelerated BHK cell penetration exhibited reduced virulence in mice.
- Both rapid cell growth and attenuation were linked to a reorganized virion structure.
- Monoclonal antibody analysis revealed alterations in viral surface proteins.
Conclusions:
- Accelerated cell culture growth of Sindbis virus mutants correlates with in vivo attenuation.
- Reorganization of virion structure is a key factor in both enhanced cell growth and reduced virulence.
- Cell culture-adapted Sindbis virus mutants show promise as attenuated vaccines and tools for pathogenesis research.
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