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Updated: Aug 23, 2025

Production of a SARS-CoV-2 Virus-Like-Particle System to Investigate Viral Life Cycles In Vitro
Published on: June 6, 2025
Evolution of naturally arising SARS-CoV-2 defective interfering particles
Samer Girgis1, Zaikun Xu2, Spyros Oikonomopoulos3
1Department of Biochemistry, McGill University, Montreal, QC, H3G 1Y6, Canada.
Defective interfering (DI) particles of SARS-CoV-2 were identified, losing most of their genome but still interfering with viral replication. These DI particles show potential as antiviral agents and gene delivery vehicles.
Area of Science:
- Virology
- Molecular Biology
- Antiviral Research
Background:
- Defective interfering (DI) particles are virus mutants dependent on a parent virus for replication and packaging.
- DI particles interfere with viral expansion, making them promising candidates for antiviral therapies.
- The emergence and characteristics of DI particles from SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2) are of significant interest.
Purpose of the Study:
- To characterize defective interfering (DI) particles that arise during serial passaging of SARS-CoV-2.
- To evaluate the potential of these DI particles as antiviral agents and gene delivery vehicles.
Main Methods:
- Serial passaging of SARS-CoV-2 at high multiplicity of infection to generate DI particles.
- Genomic characterization of prominent DI particles identified.
- Assessment of the interference capabilities of DI particles and their synthetic variants.
- Analysis of the Nsp1-10 fusion protein encoded by DI genomes for its effect on viral replication.
Main Results:
- Prominent DI particles lacking approximately 84% of the SARS-CoV-2 genome were identified.
- These DI particles demonstrated the ability to attenuate parental viral titers.
- Synthetic DI genomes also interfered with viral infection and showed potential as gene delivery vehicles.
- A fusion protein (Nsp1-10) encoded by the DI genomes was found to attenuate viral replication.
Conclusions:
- Naturally selected defective viral genomes (DI particles) of SARS-CoV-2 emerged and propagated stably in the presence of the parental virus.
- These characterized DI particles represent a promising avenue for developing novel antiviral strategies and conditional gene delivery systems.
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