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Direct simulation of yeast 2-microns circle plasmid amplification
F D Russo1, I Scherson, J R Broach
1Department of Molecular Biology, Princeton University, NJ 08544.
Journal of Theoretical Biology
|April 7, 1992
Summary
The 2-microns circle plasmid in yeast amplifies through site-specific recombination. Computational simulations reveal this mechanism can generate at least six copies per plasmid each generation, with replication intermediates playing a key role.
Area of Science:
- Molecular Biology
- Yeast Genetics
- Computational Biology
Background:
- The 2-microns circle is a high-copy-number plasmid in Saccharomyces cerevisiae.
- This plasmid exhibits replicative amplification via site-specific recombination.
Purpose of the Study:
- To evaluate the adequacy of the recombination model for 2-microns circle amplification.
- To computationally simulate the plasmid amplification system.
Main Methods:
- Development of a direct computational simulation model.
- Simulation of the site-specific recombination and replication processes.
Main Results:
- The simulation supports the recombination model's ability to explain observed amplification rates.
- Theoretical calculations indicate a potential of at least six plasmid copies per generation.
- Unanticipated replication intermediates were identified as significant contributors to amplification.
Conclusions:
- The recombination model, augmented by replication intermediates, adequately explains 2-microns circle amplification.
- Computational simulation provides a powerful tool for studying plasmid dynamics.