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Related Concept Videos

Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Viral Mutations00:36

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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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The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Mutations01:39

Mutations

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Overview
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Epistasis Analysis01:09

Epistasis Analysis

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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Mutation and Epistasis in Influenza Virus Evolution.

Daniel M Lyons1, Adam S Lauring2,3,4

  • 1Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA. lyonsdm@med.umich.edu.

Viruses
|August 8, 2018
PubMed
Summary

Influenza viruses evolve rapidly due to mutation and reassortment, impacting vaccine efficacy and antiviral treatments. Understanding these evolutionary mechanisms, including epistasis, is crucial for public health strategies against influenza.

Keywords:
epistasisevolutioninfluenzamutationreassortment

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Public Health

Background:

  • Influenza viruses pose a significant global health threat due to their continuous evolution.
  • Rapid viral evolution leads to reduced vaccine effectiveness, drug resistance, and emergence of new strains.
  • Mutation and reassortment are key mechanisms driving influenza virus adaptability.

Purpose of the Study:

  • To review recent research on mutational effects in influenza viruses.
  • To explore the role of epistasis in influenza virus evolution.
  • To understand how these factors influence viral adaptability and constraints.

Main Methods:

  • Literature review of studies on influenza virus mutation.
  • Analysis of research focusing on epistatic interactions between viral mutations.
  • Synthesis of findings on the evolutionary dynamics of influenza.

Main Results:

  • Mutational effects and epistasis are fundamental to influenza virus adaptability.
  • These evolutionary forces also impose constraints on viral evolution.
  • Understanding these interactions is key to predicting viral behavior.

Conclusions:

  • Epistatic interactions significantly shape the evolutionary trajectory of influenza viruses.
  • The interplay between mutation and epistasis dictates viral adaptability and constraints.
  • Further research into these mechanisms is vital for influenza control and prevention.