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Rolling circle replicative structure of bacteriophage lambda DNA in a recombination deficient system
Molecular & General Genetics : MGG
|April 29, 1977
Summary
Late-stage bacteriophage lambda DNA replication can form rolling-circle structures. These structures arise independently of genetic recombination or replication round termination.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- Bacteriophage lambda DNA replication is a complex process.
- Rolling-circle replication is a known mechanism for DNA synthesis.
Purpose of the Study:
- To investigate the conditions under which rolling-circle replicating structures of lambda DNA are formed.
- To determine the necessity of genetic recombination and replication termination for rolling-circle formation.
Main Methods:
- Analysis of intracellular phage lambda DNA molecules.
- Observation of replication under wild-type and recombination-deficient conditions.
- Delayed initiation of lambda replication experiments.
Main Results:
- Rolling-circle replicating structures are detectable in both wild-type and recombination-deficient lambda infections.
- When replication initiation is delayed, rolling-circle structures dominate, even in the first round.
- Genetic recombination and replication termination are not required for rolling-circle formation.
Conclusions:
- Rolling-circle replication of lambda DNA can occur without genetic recombination.
- Replication termination is not a prerequisite for generating rolling-circle structures.
- These findings clarify the mechanisms of late-stage lambda DNA replication.