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Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Cancer treatment vaccines are a rapidly evolving field that offers a promising approach to immunotherapy. Unlike traditional vaccines that prevent diseases, cancer treatment vaccines are designed to treat existing cancers by stimulating the immune system to recognize and attack cancer cells.
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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
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COVID-19 Variants and Vaccine Development.

Ziyao Zhao1, Sahra Bashiri1, Zyta M Ziora2

  • 1School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.

Viruses
|May 25, 2024
PubMed
Summary

This review covers severe acute respiratory syndrome 2 virus (SARS-CoV-2) vaccines and mutations. It details how SARS-CoV-2 mutations impact vaccine effectiveness and discusses global strategies to address these challenges.

Keywords:
COVID-19SARS-CoV-2mutationsvaccinationvaccine effectivenessvariants

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Area of Science:

  • Virology
  • Immunology
  • Public Health

Background:

  • The COVID-19 pandemic, caused by SARS-CoV-2, has led to significant global health challenges.
  • While therapeutic drugs exist, their efficacy is limited, making preventive vaccination the primary control strategy.
  • Current vaccines primarily target the SARS-CoV-2 spike protein, a critical component for viral entry.

Purpose of the Study:

  • To provide a comprehensive overview of SARS-CoV-2.
  • To summarize common SARS-CoV-2 mutations and their impact on viral properties, immune evasion, and vaccine efficacy.
  • To discuss global strategies for mitigating reduced vaccine effectiveness against emerging variants.

Main Methods:

  • Review of existing literature on SARS-CoV-2 virology, infection mechanisms, and host responses.
  • Analysis of common SARS-CoV-2 mutations and their effects on viral characteristics.
  • Examination of current vaccine designs and their susceptibility to viral mutations.
  • Discussion of global public health strategies for variant-driven vaccine efficacy challenges.

Main Results:

  • SARS-CoV-2 mutations, especially in the spike protein, can alter viral properties and lead to immune escape.
  • These mutations significantly compromise the effectiveness of existing vaccines.
  • The review highlights the dynamic interplay between viral evolution and vaccine-induced immunity.

Conclusions:

  • Understanding SARS-CoV-2 mutations is crucial for developing effective and durable vaccines.
  • Global collaboration and adaptive strategies are essential to combat the evolving threat of SARS-CoV-2 variants.
  • Continued research into vaccine design and variant surveillance is paramount for pandemic control.