Evidence map›Paper›PMID 19528653›Full record

ReviewProceedings of the National Academy of Sciences of the United States of America2009

In the light of directed evolution: pathways of adaptive protein evolution.

Jesse D Bloom, Frances H Arnold

Abstract readReview
In one paragraph

Review in Proceedings of the National Academy of Sciences of the United States of America, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 207 papers.

0numbers the graph read from it
0cells of the map it votes in
207citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

207 citing papers in PubMed.

  1. Review
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  6. Synthetic Biology Approaches to Enzymology in Food and Agriculture Systems.Journal of agricultural and food chemistry · 2026
    Review
  7. Review
  8. Article
  9. Review
  10. Article
  11. Article
  12. Review
  13. Article
  14. Directed evolution of a beta-lactamase samples a wide variety of conformational states.Protein science : a publication of the Protein Society · 2025
    Article
  15. bioRxiv : the preprint server for biology · 2025
    Article
  16. Directed evolution of hydrocarbon-producing enzymes.Biotechnology for biofuels and bioproducts · 2025
    Review
  17. Article
  18. Article
  19. Article
  20. Artificial Intelligence-Based Approaches for AAV Vector Engineering.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025
    Review

147 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors.

Jesse D BloomDivision of Biology, California Institute of Technology, Pasadena, CA 91125, USA.
Frances H Arnold

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Directed evolution is a widely-used engineering strategy for improving the stabilities or biochemical functions of proteins by repeated rounds of mutation and selection. These experiments offer empirical lessons about how proteins evolve in the face of clearly-defined laboratory selection pressures. Directed evolution has revealed that single amino acid mutations can enhance properties such as catalytic activity or stability and that adaptation can often occur through pathways consisting of sequential beneficial mutations. When there are no single mutations that improve a particular protein property experiments always find a wealth of mutations that are neutral with respect to the laboratory-defined measure of fitness. These neutral mutations can open new adaptive pathways by at least 2 different mechanisms. Functionally-neutral mutations can enhance a protein's stability, thereby increasing its tolerance for subsequent functionally beneficial but destabilizing mutations. They can also lead to changes in "promiscuous" functions that are not currently under selective pressure, but can subsequently become the starting points for the adaptive evolution of new functions. These lessons about the coupling between adaptive and neutral protein evolution in the laboratory offer insight into the evolution of proteins in nature.

Indexed as

Directed Molecular EvolutionEvolution, MolecularMutationProtein StabilityProteinsProteins

Identifiers

PMID19528653
PMCPMC2702793

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.