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Related Concept Videos

Viral Mutations00:36

Viral Mutations

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 for adaptive...
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Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
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Size and Structure of Viral Genomes

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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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Modelling viral evolution and adaptation: challenges and rewards.

Susanna C Manrubia1

  • 1Centro de Astrobiología (INTA-CSIC), Ctra. de Ajalvir km. 4, 28850 Torrejón de Ardoz, Madrid, Spain. scmanrubia@cab.inta-csic.es

Current Opinion in Virology
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Summary
This summary is machine-generated.

Viral populations exhibit high diversity, crucial for adaptation. Understanding how mutations impact fitness and viral fitness landscapes is key to accurate evolutionary modeling.

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Computational Biology

Background:

  • Viral populations display remarkable plasticity and generate high genotypic and phenotypic diversity.
  • This diversity enables various adaptive strategies, but the impact of mutations on fitness remains a significant unknown.
  • Realistic modeling of viral evolution requires understanding viral fitness landscapes.

Purpose of the Study:

  • To elucidate the role of mutations in viral fitness landscapes.
  • To improve the accuracy and predictive power of viral evolution models.
  • To integrate new insights into viral complexity, including neutral networks and co-evolutionary dynamics.

Main Methods:

  • Utilizing advanced techniques such as deep sequencing and massive computation.
  • Conducting systematic laboratory assays to study viral mutants.
  • Analyzing neutral networks of genotypes and interactions among viral mutants.

Main Results:

  • New techniques are enhancing our understanding of viral complexity.
  • The study is clarifying the roles of neutral networks, defective/cooperative interactions, and immune system co-evolution.
  • Insights are being gained into how mutations influence viral fitness.

Conclusions:

  • Improved accuracy and conceptual understanding of viral evolution models are being achieved.
  • Predictive capabilities of viral evolution models are becoming more competent.
  • A clearer picture of the factors shaping viral adaptive strategies is emerging.