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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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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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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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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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Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
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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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Why epistasis is important for selection and adaptation.

Thomas F Hansen1

  • 1Department of Biology, University of Oslo, CEES, P.O. Box 1066, Blindern, N-0316 Oslo, Norway. Thomas.Hansen@bio.uio.no.

Evolution; International Journal of Organic Evolution
|December 5, 2013
PubMed
Summary
This summary is machine-generated.

Epistasis, or gene interaction, is crucial for evolution, contrary to the belief that only additive genetic variance matters. This study clarifies the significant, lasting role of gene interactions in adaptation and evolutionary dynamics.

Keywords:
Gene interactiongenotype-phenotype mapquantitative geneticsselection response

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Quantitative genetics

Background:

  • Mathematical evolution theory often uses a gene-by-gene perspective, neglecting gene interactions (epistasis).
  • Epistasis is recognized in specific evolutionary areas but largely absent from phenotypic adaptation accounts.
  • Quantitative genetics, despite acknowledging epistasis, largely considers it evolutionarily inert, focusing on additive genetic variance.

Purpose of the Study:

  • To challenge the consensus that epistasis is evolutionarily inert.
  • To demonstrate the significant role of gene interactions in evolutionary adaptation.
  • To correct conceptual misunderstandings regarding epistasis's impact on selection response.

Main Methods:

  • Theoretical analysis of evolutionary dynamics.
  • Re-evaluation of existing theoretical results on epistasis.
  • Conceptual clarification of gene interaction's role in selection response.

Main Results:

  • The perceived evolutionary inertness of epistasis stems from conceptual confusion.
  • Theoretical results suggesting epistasis's decay under relaxed selection are misleading.
  • Epistasis significantly influences selection response and adaptation.

Conclusions:

  • Epistasis plays a vital and permanent role in evolutionary adaptation.
  • The additive component of genetic variance is insufficient for predicting evolutionary dynamics.
  • A more comprehensive understanding of gene interactions is necessary for evolutionary theory.