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SARS-CoV-2 Variants and Their Relevant Mutational Profiles: Update Summer 2021
Mohammad Alkhatib1, Valentina Svicher1, Romina Salpini1
1Department of Experimental Medicine, University of Rome Tor Vergatagrid.6530.0, Rome, Italy.
Microbiology Spectrum
|November 17, 2021
Summary
This study defines the genetic signatures of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants, focusing on spike mutations that impact infectivity and antigenicity. Understanding these mutations is crucial for tracking viral evolution and vaccine efficacy.
Area of Science:
- Virology
- Genomics
- Molecular Biology
Background:
- The COVID-19 pandemic, caused by SARS-CoV-2, has seen continuous viral genetic diversification.
- Emergence of new variants necessitates clear definitions of their genetic signatures.
- Spike protein mutations are key drivers of SARS-CoV-2 infectivity and antigenicity.
Purpose of the Study:
- To provide a comprehensive analysis of mutational profiles for circulating SARS-CoV-2 variants.
- To identify specific genetic signatures, particularly in the spike protein, associated with clinical and diagnostic impacts.
- To map mutations onto the spike protein structure to understand their functional implications.
Main Methods:
- Analysis of SARS-CoV-2 variants and mutations from GISAID, Nextstrain, Outbreak.info, Pango, and Stanford databases.
- Retrieval and analysis of 1,223,338 high-quality full-length SARS-CoV-2 genome sequences from GISAID.
- Mapping of identified mutations onto the 3D structure of the SARS-CoV-2 spike protein.
Main Results:
- Detailed mutational profiles for key SARS-CoV-2 variants were established.
- Focus on spike mutations influencing viral infectivity and antigenicity.
- Identification of recurrent mutations in the spike protein linked to variants of concern (VOCs) and interest (VOIs).
Conclusions:
- The study provides a clear definition of genetic signatures characterizing circulating SARS-CoV-2 variants.
- Understanding these signatures is vital for tracking viral evolution and assessing vaccine and therapeutic efficacy.
- Highlights the importance of spike protein mutations and other protein alterations in SARS-CoV-2 diversification.
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