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Marker rescue allows direct selection for recombinant plasmids in streptococci
Molecular & General Genetics : MGG
|January 1, 1982
Summary
Streptococcal plasmid derivatives efficiently rescue antibiotic resistance genes. Inserting DNA next to a resistance gene forces its co-rescue, enabling direct selection of recombinant plasmids.
Area of Science:
- Molecular Biology
- Microbiology
- Genetics
Background:
- Streptococcal plasmid vectors are crucial tools in molecular biology.
- Efficient methods for generating recombinant plasmids are essential for genetic manipulation.
Purpose of the Study:
- To develop a method for high-frequency selection of recombinant streptococcal plasmids.
- To utilize antibiotic resistance gene rescue for direct selection of engineered plasmids.
Main Methods:
- Construction of resident deletion derivatives (Ems or Cms) of the pGB301 streptococcal plasmid vector.
- Insertion of passenger DNA adjacent to specific antibiotic resistance determinants on pGB301.
- Selection for antibiotic resistance to identify plasmids containing inserted DNA.
Main Results:
- Deletion derivatives of pGB301 demonstrated high-frequency rescue of antibiotic resistance genes from linearized DNA.
- Insertion of passenger DNA forced the co-rescue of the inserted DNA along with the antibiotic resistance determinant.
- This strategy allowed for direct selection of recombinant plasmids carrying the passenger DNA.
Conclusions:
- The developed method provides a highly efficient system for generating and selecting recombinant streptococcal plasmids.
- This approach simplifies the process of genetic engineering in streptococci by enabling direct selection.
- The findings have implications for molecular cloning and genetic manipulation in various bacterial systems.