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R62, a naturally occurring hybrid R plasmid
Journal of Bacteriology
|July 1, 1974
Summary
The R62 plasmid, a unique deoxyribonucleic acid molecule, contains genetic sequences from both I and N groups. This study concludes R62 resulted from recombination between I and N group plasmids.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- R factors are plasmids conferring resistance to antibiotics.
- Plasmids are extrachromosomal DNA molecules that replicate independently.
- Plasmids are classified into groups based on their compatibility and replication origins.
Purpose of the Study:
- To characterize the R62 plasmid.
- To determine the genetic origin and composition of R62.
- To understand the genetic interactions between R62 and other plasmids.
Main Methods:
- Plasmid DNA extraction and analysis.
- Genetic characterization of R62.
- Compatibility testing with other plasmids.
Main Results:
- R62 is a single deoxyribonucleic acid molecule.
- R62 contains polynucleotide sequences typical of both I and N group plasmids.
- R62 determines I pili and belongs to the Ialpha compatibility group.
- R62 exhibits complex genetic reactions with N plasmids despite compatibility.
Conclusions:
- R62 is a hybrid plasmid formed by recombination.
- The genetic makeup of R62 suggests an illegitimate recombination event.
- R62 represents a novel combination of genetic elements from different plasmid groups.