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Related Concept Videos

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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Viral Mutations00:36

Viral Mutations

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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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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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Viral Recombination00:57

Viral Recombination

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Updated: Aug 16, 2025

Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
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Approaching Challenges Posed by SARS-CoV-2 Genetic Variants.

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This study highlights the significant impact and concerns of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its emerging variants. It emphasizes the critical need for ongoing research into viral evolution and public health strategies.

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Area of Science:

  • Virology
  • Infectious Diseases
  • Public Health

Background:

  • The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has underscored the importance of understanding viral evolution and transmission.
  • The emergence of SARS-CoV-2 variants presents ongoing challenges to public health interventions and vaccine efficacy.

Discussion:

  • This collection features a key 2021 article from *Pathogens* focusing on the impact and concerns surrounding SARS-CoV-2 and its variants.
  • The article underscores the dynamic nature of the virus and the necessity for continuous monitoring and adaptation of control measures.

Key Insights:

  • SARS-CoV-2 variants pose significant public health concerns due to potential changes in transmissibility, virulence, and immune evasion.
  • Understanding the molecular mechanisms driving variant emergence is crucial for developing effective countermeasures.

Outlook:

  • Continued research into SARS-CoV-2 variants is essential for informing future pandemic preparedness and response strategies.
  • International collaboration and data sharing are vital for tracking viral evolution and implementing timely interventions.