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Updated: Jul 28, 2025
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Detection of Horizontal Gene Transfer Mediated by Natural Conjugative Plasmids in E. coli
Published on: March 24, 2023
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Is cooperation favored by horizontal gene transfer?
Thomas W Scott1, Stuart A West1, Anna E Dewar1
1Department of Biology, University of Oxford, Oxford, United Kingdom.
Evolution Letters
|May 30, 2023
Summary
Horizontal gene transfer on plasmids can facilitate bacterial cooperation, but only when plasmids are rare. When common, plasmids reduce cooperation, leading to low overall plasmid-mediated cooperation.
Area of Science:
- Evolutionary biology
- Microbial genetics
- Theoretical ecology
Background:
- Horizontal gene transfer (HGT) via plasmids is a key mechanism in bacterial evolution.
- Plasmids are hypothesized to increase genetic relatedness, thereby promoting cooperation.
Purpose of the Study:
- To theoretically investigate the impact of HGT on the evolution of cooperation.
- To determine the relationship between plasmid frequency and bacterial cooperation.
Main Methods:
- Mathematical modeling of bacterial populations with plasmids.
- Analysis of genetic relatedness and cooperation dynamics under varying plasmid frequencies.
Main Results:
- HGT significantly increases genetic relatedness only when plasmids are rare.
- When plasmids are common, opportunities for HGT decrease, limiting relatedness and cooperation.
- Plasmids evolve towards being either rare and cooperative or common and noncooperative.
Conclusions:
- Plasmids do not consistently favor high levels of cooperation.
- The frequency of plasmids and their cooperative nature are inversely related.
- Overall plasmid-mediated cooperation is typically negligible or low.
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