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Related Experiment Video

Updated: May 5, 2026

Identifying Protein-protein Interaction in Drosophila Adult Heads by Tandem Affinity Purification TAP
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Adaptive protein evolution in Drosophila.

Nick G C Smith1, Adam Eyre-Walker

  • 1Centre for the Study of Evolution and School of Biological Sciences, University of Sussex, Brighton BN1 9QG, UK.

Nature
|March 5, 2002
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Summary
This summary is machine-generated.

Natural selection significantly drives DNA evolution. Researchers estimate 45% of amino acid changes in Drosophila species result from adaptive evolution, with one such change occurring every 45 years.

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Area of Science:

  • Molecular Evolution
  • Population Genetics
  • Genomics

Background:

  • A long-standing debate in molecular evolution concerns the role of natural selection in DNA sequence evolution.
  • While adaptive evolution at the protein level is increasingly supported, its prevalence remains uncertain.

Purpose of the Study:

  • To develop a simple method for estimating the number of adaptive substitutions.
  • To quantify the prevalence of adaptive evolution at the DNA sequence level in specific species.

Main Methods:

  • Development of a novel statistical method to estimate adaptive substitutions.
  • Application of the method to DNA sequence data from Drosophila simulans and Drosophila yakuba.

Main Results:

  • An estimated 45% of all amino acid substitutions are fixed by natural selection.
  • An average of one adaptive substitution occurs approximately every 45 years in the studied Drosophila species.

Conclusions:

  • Natural selection plays a substantial role in driving molecular evolution at the DNA sequence level.
  • The findings provide quantitative estimates for the rate of adaptive evolution in these species.