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Therapeutic interfering particles exploiting viral replication and assembly mechanisms show promising performance: a
Farzad Fatehi1,2, Richard J Bingham1,2,3, Pierre-Philippe Dechant1,2,4
1York Cross-disciplinary Centre for Systems Analysis, University of York, York, YO10 5GE, UK.
Scientific Reports
|December 14, 2021
Summary
Therapeutic interfering RNAs (tiRNAs) can be designed to combat RNA viral infections. A small increase in tiRNA efficiency can lead to over 99% treatment efficacy against viruses like hepatitis C virus.
Area of Science:
- Virology
- Molecular Biology
- Drug Discovery
Background:
- Defective interfering particles (DIPs) are viral mutants that replicate at the expense of wild-type (WT) viruses.
- Therapeutic interfering particles (TIPs) mimic DIPs for antiviral strategies.
- Positive-sense single-stranded RNA viruses utilize packaging signals for assembly.
Purpose of the Study:
- To propose a design strategy for therapeutic interfering RNAs (tiRNAs) against RNA viruses.
- To evaluate the efficacy of tiRNAs in a hepatitis C virus (HCV) infection model.
Main Methods:
- Designed tiRNAs with optimized viral assembly signals and replication signals, lacking protein-coding regions.
- Utilized an intracellular HCV infection model to simulate competition between tiRNAs and WT virus for viral proteins.
- Assessed competition dynamics for capsid protein and polymerase.
Main Results:
- A small enhancement in tiRNA assembly and replication efficiency significantly impacted viral competition.
- Achieved over 99% treatment efficacy in the simulated HCV infection model.
- Demonstrated the potential of tiRNA design for effective antiviral therapy.
Conclusions:
- The proposed tiRNA design strategy is effective against RNA viruses.
- tiRNAs represent a promising therapeutic approach for viral infections.
- Optimized interference strategies can overcome viral replication challenges.
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