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Maintenance of bacteriophage P1 plasmid
Journal of Virology
|September 1, 1977
Summary
Bacteriophage P1 mutants exhibit unstable lysogeny, leading to high nonlysogen segregation and cell filamentation. These findings suggest P1 encodes functions critical for its own stable maintenance and segregation.
Area of Science:
- Bacteriophage genetics
- Molecular biology
- Microbial genetics
Background:
- Bacteriophage P1 is a model system for studying lysogeny.
- Stable maintenance of the lysogenic state is crucial for phage survival.
Purpose of the Study:
- To characterize bacteriophage P1 mutants with defects in stable lysogeny.
- To investigate the genetic basis of prophage instability and its impact on host cell physiology.
Main Methods:
- Isolation and characterization of bacteriophage P1 mutants.
- Analysis of lysogenic segregation rates and host cell morphology.
- Genetic mapping and complementation studies, including recA and ant mutations.
Main Results:
- Three P1 mutants showed high rates of nonlysogen segregation (1-30% per division) and host cell elongation.
- Mutations were classified into two groups based on genetic location, recA lysogenization ability, and suppressibility by ant mutations.
- Mutants capable of lysogenizing recA bacteria still exhibited instability and partial cell division inhibition.
Conclusions:
- Plasmid-linked mutations can confer prophage instability in bacteriophage P1.
- These results imply that P1 encodes functions essential for its autonomy and segregation.
- The study highlights the genetic basis of prophage stability and its interaction with host cell division machinery.