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Related Experiment Videos

Natural selection and the molecular clock.

J H Gillespie1

  • 1Department of Genetics, University of California, Davis 95616.

Molecular Biology and Evolution
|March 1, 1986
PubMed
Summary

Protein evolution statistics align with natural selection models. This suggests that natural selection, not neutral drift, drives episodic bursts of genetic substitutions over time.

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Area of Science:

  • Evolutionary biology
  • Molecular evolution
  • Population genetics

Background:

  • The molecular clock hypothesis suggests relatively constant rates of molecular evolution.
  • Previous models often assumed a simple Poisson process for substitutions.
  • Understanding the dynamics of protein evolution is key to evolutionary studies.

Purpose of the Study:

  • To statistically analyze protein evolution patterns.
  • To test the compatibility of these patterns with natural selection models.
  • To propose a generalized model for molecular substitution processes.

Main Methods:

  • Statistical analysis of molecular clock data.
  • Modeling protein evolution with changing environments and epistasis.
  • Generalizing existing substitution process models.

Main Results:

  • Protein evolution exhibits episodic substitution patterns, not a simple Poisson process.
  • A natural selection model accurately replicates these episodic dynamics.
  • A new formula for correcting multiple substitutions was derived.

Conclusions:

  • Natural selection is a viable explanation for observed protein evolution dynamics.
  • Episodic substitution patterns are a hallmark of natural selection.
  • Neutral allele theory inadequately explains these evolutionary dynamics.

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