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Related Concept Videos

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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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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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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Epistatically interacting substitutions are enriched during adaptive protein evolution.

Lizhi Ian Gong1, Jesse D Bloom1

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Summary
This summary is machine-generated.

Epistasis, or gene interaction, is more common during adaptation in human influenza evolution than in swine influenza. This suggests evolutionary forces influence the prevalence of epistasis.

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Area of Science:

  • Evolutionary biology
  • Molecular evolution
  • Genetics

Background:

  • Epistasis, the interaction between genes, is crucial in evolutionary processes.
  • Most studies on epistasis focus on adaptive evolution, leaving non-adaptive evolutionary patterns under-explored.
  • Understanding epistasis in different evolutionary contexts is key to a comprehensive view of evolution.

Purpose of the Study:

  • To investigate if epistasis patterns during adaptation are representative of broader evolutionary changes.
  • To compare epistasis in human influenza, which faces strong adaptive pressure, with swine influenza, which experiences less.
  • To determine the role of evolutionary forces in shaping epistasis.

Main Methods:

  • Comparative analysis of nucleoproteins from human and swine influenza.
  • Focus on mutations within immune epitopes targeted by human cytotoxic T lymphocytes.
  • Experimental validation of epistatically constrained mutations in influenza lineages.

Main Results:

  • Mutations in immune epitopes are fixed more frequently in human influenza than swine influenza.
  • Epistatically constrained mutations were found exclusively in the adaptively evolving human influenza lineage.
  • These constrained mutations occurred at sites enriched in epitopes within the human influenza nucleoprotein.

Conclusions:

  • Epistasis is significantly enriched during adaptive evolution.
  • The prevalence of epistasis is dependent on the specific evolutionary pressures acting on a lineage.
  • Findings highlight the context-dependent nature of epistasis in molecular evolution.