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Experimental evolution of conflict mediation between genomes
1Section of Integrative Biology, Patterson Laboratories, University of Texas, 1 University Station C0930, Austin, TX 78712-0253, USA. jlsachs@berkeley.edu
Summary
Two bacteriophages evolved cooperation by packaging genomes together, preventing conflict. This led to genome reduction and obligate coexistence, mirroring natural evolutionary strategies.
Area of Science:
- Evolutionary biology
- Microbial genetics
- Systems biology
Background:
- Biological complexity arises from cooperation, but individual selection can favor selfishness, hindering cooperation.
- Understanding systems with both cooperation and conflict is challenging due to unpredictable evolutionary trajectories.
Purpose of the Study:
- To investigate the evolution of cooperation and conflict mediation in bacteriophages under experimental constraints.
- To determine if cooperation can evolve from a system with inherent conflict.
Main Methods:
- Experimental evolution of two bacteriophages (f1 and IKe) with a modified life cycle.
- Genomic analysis to identify evolutionary changes and mechanisms of cooperation.
Main Results:
- The two phages evolved a novel conflict mediation system, copackaging genomes into a single virion.
- This copackaging ensured cotransmission and significantly reduced within-host conflict.
- One phage (IKe) underwent extreme genome reduction, becoming dependent on the other (f1) for replication.
Conclusions:
- Cooperation can evolve through conflict mediation mechanisms, such as cotransmission and genome reduction.
- The observed evolution parallels natural systems involving symbionts and obligate coexistence.
- Experimental evolution provides insights into the emergence of cooperation in biological systems.