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SARS-CoV-2 one year on: evidence for ongoing viral adaptation
Thomas P Peacock1, Rebekah Penrice-Randal2, Julian A Hiscox2,3
1Department of Infectious Diseases, St Marys Medical School, Imperial College London, UK.
The Journal of General Virology
|April 15, 2021
Summary
The SARS-CoV-2 virus evolves through genetic mutations like SNPs and indels, leading to new variants. Some variants may impact transmissibility and pathogenicity, influencing the pandemic's future course.
Area of Science:
- Virology
- Genetics
- Epidemiology
Background:
- Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) originated from zoonotic spillover, causing COVID-19 with significant global mortality.
- Widespread circulation has led to the selection of SARS-CoV-2 variants, necessitating an understanding of viral evolution.
Purpose of the Study:
- To review the extent of genetic change in SARS-CoV-2, focusing on emerging variants of concern.
- To analyze the phenotypic consequences of viral evolution and their potential impact on the pandemic's future trajectory.
Main Methods:
- Review of current scientific literature on SARS-CoV-2 genetic variation.
- Analysis of sequencing data to identify predominant mutation types (SNPs, indels).
- Assessment of potential phenotypic impacts of identified mutations and variants.
Main Results:
- Genetic variation in SARS-CoV-2 is driven by polymerase errors, host RNA modification, and RNA synthesis mechanisms.
- While many mutations are neutral, a subset affects key viral traits like transmissibility, pathogenicity, host range, and antigenicity.
- Emerging variants of concern exhibit significant genetic changes with potential phenotypic consequences.
Conclusions:
- Understanding SARS-CoV-2 genetic evolution, including variants, is crucial for predicting and managing the pandemic.
- Viral evolution may alter disease dynamics, necessitating ongoing surveillance and research into viral traits.
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