SARS-CoV-2 Variant Characterization and Immunological Responses
Summary
The rapid emergence of SARS-CoV-2 variants has profoundly influenced our understanding of viral evolution and host immunity. Characterisation of these lineages integrates genomic surveillance to identify spike protein mutations, in vitro assays to assess infectivity and receptor binding, and structural studies elucidating conformational changes. Variants of concern, including Alpha, Beta, Delta and Omicron, exhibit distinct combinations of mutations within the receptor-binding domain, the N-terminal domain and other spike substructures that collectively modulate transmissibility, pathogenicity and antigenicity. Concurrently, immunological investigations have mapped humoral and cellular responses following natural infection or vaccination, revealing the kinetics of neutralising antibody titres, memory B cell persistence and T cell reactivity. Data show that successive variants accumulate antigenic changes that can diminish neutralisation potency of convalescent and vaccine-induced sera, while cross-reactive T cell epitopes remain largely conserved. Such insights underpin the adaptive strategies deployed worldwide, from booster immunisation campaigns to the design of next-generation vaccines tailored against emerging strains. This multidisciplinary framework of variant characterisation and immunoprofiling is pivotal for forecasting viral trajectories, refining therapeutic antibodies and safeguarding global health against further SARS-CoV-2 antigenic drift.
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SARS-CoV-2 Variant Characterization and Immunological Responses publication trend
The graph below shows the total number of articles in sars-cov-2 variant characterization and immunological responses across all publications each year (not limited to Nature Index journals).
Technical terms
Spike protein: Surface glycoprotein of SARS-CoV-2 responsible for receptor engagement and membrane fusion.
Receptor-binding domain (RBD): Subregion of the spike protein that directly interacts with the host ACE2 receptor.
Neutralising antibody: Antibody capable of blocking viral entry into host cells, thereby preventing infection.
Virus-like particles (VLPs): Non-infectious assemblies that mimic viral structure for studying entry and immune recognition.
Hybrid immunity: Combined immune protection resulting from both natural infection and vaccination.
References
- Omicron mutations enhance infectivity and reduce antibody neutralization of SARS-CoV-2 virus-like particles. Proceedings of the National Academy of Sciences of the United States of America (2022).
- Human serum from SARS-CoV-2-vaccinated and COVID-19 patients shows reduced binding to the RBD of SARS-CoV-2 Omicron variant. BMC Medicine (2022).
- Sub-optimal neutralisation of omicron (B.1.1.529) variant by antibodies induced by vaccine alone or SARS-CoV-2 Infection plus vaccine (hybrid immunity) post 6-months. EBioMedicine (2022).
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