Evidence map›Paper›PMID 34083444›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2021

Coevolutionary phage training leads to greater bacterial suppression and delays the evolution of phage resistance.

Joshua M Borin, Sarit Avrani, Jeffrey E Barrick, Katherine L Petrie, Justin R Meyer

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 122 papers.

0numbers the graph read from it
0cells of the map it votes in
122citing 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

122 citing papers in PubMed.

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  16. Review
  17. Phase variation inEngineering microbiology · 2026
    Article
  18. Article
  19. Article
  20. Phage-Based Approaches to ChronicAntibiotics (Basel, Switzerland) · 2026
    Review

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

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

5 authors.

Joshua M BorinDivision of Biological Sciences, University of California San Diego, San Diego, CA 92093.ORCID 0000-0002-9086-3381
Sarit AvraniDepartment of Evolutionary and Environmental Biology and The Institute of Evolution, University of Haifa, 3498838 Haifa, Israel.ORCID 0000-0002-3622-6779
Jeffrey E BarrickDepartment of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712.ORCID 0000-0003-0888-7358
Katherine L PetrieDivision of Biological Sciences, University of California San Diego, San Diego, CA 92093.ORCID 0000-0001-6912-8289
Justin R MeyerDivision of Biological Sciences, University of California San Diego, San Diego, CA 92093; jrmeyer@ucsd.edu.ORCID 0000-0001-5566-8452

Funding

GENETIC MECHANISMS AND REGULATIONT32GM007240 · NIGMS · UNIVERSITY OF CALIFORNIA, SAN DIEGO · PI HAMPTON, RANDOLPH Y. · 1985 to 2019
$23.8M
Pathways in Biological Sciences Training ProgramT32GM133351 · NIGMS · UNIVERSITY OF CALIFORNIA, SAN DIEGO · PI Matthew Daugherty, Randolph Y. Hampton · 2020 to 2026
$9.9M
The biophysical basis of translational selectionR01GM088344 · NIGMS · UNIVERSITY OF TEXAS AT AUSTIN · PI BARRICK, JEFFREY EVAN, WILKE, CLAUS O · 2009 to 2023
$3.5M
NIGMS NIH HHS R01 GM088344NIGMS NIH HHS T32 GM007240NIGMS NIH HHS T32 GM133351
6 · The paper itself

Abstract

The evolution of antibiotic-resistant bacteria threatens to become the leading cause of worldwide mortality. This crisis has renewed interest in the practice of phage therapy. Yet, bacteria's capacity to evolve resistance may debilitate this therapy as well. To combat the evolution of phage resistance and improve treatment outcomes, many suggest leveraging phages' ability to counter resistance by evolving phages on target hosts before using them in therapy (phage training). We found that in vitro, λtrn, a phage trained for 28 d, suppressed bacteria ∼1,000-fold for three to eight times longer than its untrained ancestor. Prolonged suppression was due to a delay in the evolution of resistance caused by several factors. Mutations that confer resistance to λtrn are ∼100× less common, and while the target bacterium can evolve complete resistance to the untrained phage in a single step, multiple mutations are required to evolve complete resistance to λtrn. Mutations that confer resistance to λtrn are more costly than mutations for untrained phage resistance. Furthermore, when resistance does evolve, λtrn is better able to suppress these forms of resistance. One way that λtrn improved was through recombination with a gene in a defunct prophage in the host genome, which doubled phage fitness. This transfer of information from the host genome is an unexpected but highly efficient mode of training phage. Lastly, we found that many other independently trained λ phages were able to suppress bacterial populations, supporting the important role training could play during phage therapeutic development.

Indexed as

Host-Pathogen InteractionsMutationBacteriophage lambdaEscherichia colicoevolutionevolutionphage therapyphage trainingresistance

Identifiers

PMID34083444
PMCPMC8201913

What OpenQuestion holds

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Read underepoch 390

Registered trials

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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.