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Rapid assessment of SARS-CoV-2-evolved variants using virus-like particles
Abdullah M Syed1,2, Taha Y Taha3, Takako Tabata3
1Gladstone Institute of Data Science and Biotechnology, San Francisco, CA, USA.
Science (New York, N.Y.)
|November 4, 2021
Summary
New research reveals that mutations in the nucleocapsid (N) protein, not just the spike (S) protein, significantly enhance severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant transmissibility. This finding offers new insights into viral evolution and spread.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Understanding severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant fitness is crucial for public health.
- Previous studies focused on spike (S) protein mutations using S-pseudotyped particles, limiting analysis of other viral components.
Purpose of the Study:
- To investigate the role of mutations in all structural proteins of SARS-CoV-2, beyond the spike protein, in enhancing viral fitness.
- To develop a novel platform for analyzing SARS-CoV-2 variants and their life cycle.
Main Methods:
- Development and utilization of SARS-CoV-2 virus-like particles (SC2-VLPs) capable of packaging and delivering exogenous transcripts.
- Analysis of mutations within all structural proteins, including the nucleocapsid (N) protein.
- Reverse genetics modeling to assess the impact of specific N mutations (S202R, R203M) on viral production.
Main Results:
- Four nucleocapsid (N) mutations universally found in transmissible variants independently increased messenger RNA delivery and expression approximately 10-fold.
- Specific mutations, serine-202→arginine (S202R) and arginine-203→methionine (R203M), each resulted in over 50 times more virus production in a reverse genetics model.
- SC2-VLPs facilitate rapid variant testing outside of high-containment biosafety level 3 settings.
Conclusions:
- Nucleocapsid (N) protein mutations and particle assembly are significant mechanisms contributing to the increased spread of SARS-CoV-2 variants.
- The SC2-VLP platform offers a valuable tool for studying viral variants and their evolution.
- Findings provide a more comprehensive understanding of SARS-CoV-2 variant fitness, including variants like B.1.617.2 (Delta).
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