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How genomic and developmental dynamics affect evolutionary processes.

G Dover1

  • 1Department of Genetics, University of Leicester, University Road, Leicester, LE1 7RH, UK.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|November 21, 2000
PubMed
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Evolutionary genetics needs to incorporate genomic turnover alongside natural selection and genetic drift. This approach better explains how genetic system changes drive the evolution of complex phenotypes.

Area of Science:

  • Evolutionary Biology
  • Genetics
  • Molecular Biology

Background:

  • Current evolutionary genetics primarily focuses on natural selection and neutral drift, often simplifying phenotypes to DNA variations.
  • This narrow focus overlooks the crucial role of internal and external forces in shaping phenotypic evolution.
  • A comprehensive evolutionary theory requires understanding how genetic systems contribute to phenotypic diversity.

Purpose of the Study:

  • To highlight the significance of genomic mechanisms, such as turnover, in driving phenotypic evolution.
  • To emphasize the interplay between genetic system complexity and evolutionary forces.
  • To propose a more holistic view of evolutionary genetics that includes genetic system dynamics.

Main Methods:

  • Analysis of genetic system properties: redundancy, modularity, and genomic turnover mechanisms (e.g., transposition, gene conversion).

Related Experiment Videos

  • Examination of how novel combinations of genetic modules, particularly in gene promoters, influence phenotype development.
  • Investigation of the coevolutionary dynamics between genomic turnover and natural selection.

    • Main Results:

    • Genetic systems exhibit redundancy, modularity, and are shaped by genomic turnover.
    • Turnover mechanisms, especially in gene promoters, significantly contribute to the construction and spread of novel module combinations, driving phenotypic evolution.
    • Increased complexity in genetic interaction networks arises from redundancy, turnover, and modularity.

    Conclusions:

    • Genomic turnover, acting on redundant and modular genetic systems, is a key driver of phenotypic evolution.
    • The interaction between genomic turnover and natural selection promotes molecular coevolution and the emergence of biological novelties.
    • A broader perspective encompassing genetic system dynamics is essential for a comprehensive theory of evolution.