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Related Concept Videos

Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

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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Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.

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Related Experiment Video

Updated: Jun 18, 2026

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
09:01

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

Published on: March 16, 2011

Exploring protein fitness landscapes by directed evolution.

Philip A Romero1, Frances H Arnold

  • 1Division of Chemistry and Chemical Engineering, 21041, California Institute of Technology, Pasadena, California 91125, USA. promero@caltech.edu

Nature Reviews. Molecular Cell Biology
|November 26, 2009
PubMed
Summary

Directed evolution uses mutation and selection to create novel proteins, offering insights into protein function and evolution. This powerful technique reveals how proteins adapt and how neutral mutations can enable future adaptations.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Protein sequence-function relationships remain largely unknown.
  • Directed evolution offers a method to overcome this knowledge gap.

Purpose of the Study:

  • To explore the utility of directed evolution in discovering new proteins.
  • To investigate protein adaptation and the role of neutral mutations.

Main Methods:

  • Iterative rounds of random mutagenesis.
  • Artificial selection for desired protein functions.
  • Analysis of evolutionary intermediates.

Main Results:

  • Successfully discovered new and useful proteins.
  • Demonstrated rapid protein evolution under selection.
  • Provided insights into sequence-function relationships.
  • Identified functionally neutral mutations that facilitate adaptation.

Conclusions:

  • Directed evolution is a powerful tool for protein engineering.
  • It offers a unique window into evolutionary processes.
  • Neutral mutations play a crucial role in enabling future adaptive evolution.