Summary
Iterative mutation and selection in the lab to improve enzymes, earning the 2018 Nobel Prize in Chemistry.
In depth
Frances Arnold used error-prone PCR and screening to evolve enzymes (subtilisin active in organic solvents), Nobel 2018. Phage display (Smith and Winter) evolves antibodies. Continuous methods like PACE speed it.
Libraries of variants are created by error-prone PCR or DNA shuffling, screened or selected for improved function and repeated. It mimics evolution on lab timescales.
Example: enzymes evolved for detergents work at low temperatures.
Directed evolution mimics natural selection in test tubes to improve proteins. Frances Arnold, who shared the 2018 Nobel Prize in Chemistry, mutated genes randomly (error-prone PCR or DNA shuffling), screened thousands of variants for improved function, and used the best as the starting point for the next round.
It requires no detailed knowledge of structure and has produced enzymes that work in heat, solvents or non-natural reactions, such as forming carbon-silicon bonds. Phage display, shared by Smith and Winter, evolves antibodies.
Example: improved enzymes in laundry detergents and biofuel production.
Remember: success depends on a good screen or selection, summed up as you get what you screen for.
Frequently asked questions
What is Directed Evolution?
Iterative mutation and selection in the lab to improve enzymes, earning the 2018 Nobel Prize in Chemistry.
Which area of biology covers Directed Evolution, and how advanced is it?
Directed Evolution is one of the 56 topics in Biotechnology & Genomics. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Protein Structure Prediction, Restriction Enzymes, Gene Cloning Workflow.
Can you give an example of Directed Evolution?
Evolved enzymes make pharmaceuticals more sustainably.
What should I learn before Directed Evolution?
Work through the Beginner topics in Biotechnology & Genomics first, such as Biotechnology, Genetic Engineering, Selective Breeding, then return to Directed Evolution. Advanced topics assume the Intermediate vocabulary.
What topics are related to Directed Evolution?
The closest topics to Directed Evolution are Protein Structure Prediction, Restriction Enzymes, Gene Cloning Workflow, Metabolic Pathway Engineering in Yeast. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Directed Evolution?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Directed Evolution. To practise the whole of Biotechnology & Genomics, use the Biotechnology & Genomics quiz.
How is Directed Evolution different from Protein Structure Prediction?
Directed Evolution: Iterative mutation and selection in the lab to improve enzymes, earning the 2018 Nobel Prize in Chemistry. Protein Structure Prediction: Deep-learning systems like AlphaFold predict 3D protein structures from amino acid sequences. Read both side by side and note what each one explains.
How should I study Directed Evolution step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Protein Structure Prediction and explain the difference aloud. Finally, take the Biotechnology & Genomics quiz and come back to this page for any question you miss.