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Related Concept Videos

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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Viral Recombination00:57

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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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Viruses with RNA Genomes01:29

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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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Subviral Agents01:29

Subviral Agents

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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Horizontal Gene Transfer01:27

Horizontal Gene Transfer

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Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
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Genetic Drift03:33

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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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Generation of Escape Variants of Neutralizing Influenza Virus Monoclonal Antibodies
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New variant gains ground.

Michael Le Page

    New Scientist (1971)
    |December 6, 2021
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    Summary
    This summary is machine-generated.

    A new delta coronavirus variant, AY.4.2, shows increased transmissibility but no greater danger. This finding is crucial for understanding and managing the ongoing pandemic.

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    Area of Science:

    • Virology
    • Epidemiology
    • Public Health

    Background:

    • The emergence of SARS-CoV-2 variants necessitates continuous monitoring of their evolutionary trajectory.
    • Delta variant sublineages, such as AY.4.2, require specific investigation due to potential changes in transmission dynamics.

    Purpose of the Study:

    • To assess the transmissibility and pathogenicity of the AY.4.2 sublineage compared to other SARS-CoV-2 variants.
    • To provide timely information for public health strategies regarding viral evolution.

    Main Methods:

    • Phylogenetic analysis of viral genomes to identify AY.4.2.
    • Epidemiological data analysis to compare transmission rates.
    • Clinical data review to assess disease severity.

    Main Results:

    • The AY.4.2 lineage demonstrates a higher transmission rate than previously dominant delta strains.
    • No evidence suggests AY.4.2 causes more severe disease or increased risk of hospitalization.

    Conclusions:

    • AY.4.2 represents a more transmissible, but not more virulent, offshoot of the delta variant.
    • Continued surveillance is essential to track the spread and impact of emerging SARS-CoV-2 variants.