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Epistasis Analysis01:09

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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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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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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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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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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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Environment determines epistatic patterns for a ssDNA virus.

S Brian Caudle1, Craig R Miller, Darin R Rokyta

  • 1Department of Biological Science, Florida State University, Tallahassee, Florida 32306.

Genetics
|November 12, 2013
PubMed
Summary
This summary is machine-generated.

Epistasis, or gene interaction, patterns change with environment. A simple model explains these shifts by linking genotype to phenotype, showing how temperature affects mutation interactions in bacteriophage ID11.

Keywords:
bacteriophagebeneficial mutationepistasis

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Molecular biology

Background:

  • Epistatic interactions between mutations are complex and lack consistent patterns.
  • Environmental conditions can influence mutation effects and epistasis.
  • A model of additive phenotypes and nonlinear fitness mapping explained epistasis in bacteriophage ID11.

Purpose of the Study:

  • To investigate if a simple model could explain changes in epistatic patterns across different environments.
  • To determine how temperature affects epistatic interactions in bacteriophage ID11 mutations.

Main Methods:

  • Measured epistatic interactions of bacteriophage ID11 mutations at three temperatures (33°, 37°, and 41°C).
  • Assayed fitnesses to understand genotype-phenotype relationships under varying thermal conditions.
  • Compared an additive-phenotypes model with a model allowing temperature-dependent phenotypes.

Main Results:

  • Epistasis was present and negative across all tested temperatures, intensifying with increasing temperature.
  • An additive-phenotypes model explained observed patterns through changes in phenotype-fitness map parameters.
  • A model incorporating temperature-dependent phenotypes provided a significantly better explanation of the data.

Conclusions:

  • Complex epistasis patterns across environments can be explained by a simple genotype-phenotype relationship structure.
  • Environmental factors, like temperature, modulate epistatic interactions.
  • The study highlights the importance of considering environmental context in evolutionary genetics.