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Cloning DNA fragments between two adjacent/overlapping restriction sites using a "positive stuffer"
E Loukianov1, T Loukianova, M Periasamy
1Division of Cardiology, University of Cincinnati College of Medicine, OH 45267-0542, USA.
Biotechniques
|May 1, 1997
Summary
A novel intermediary plasmid simplifies directional cloning by overcoming restriction enzyme site issues. This method uses a selectable stuffer to ensure successful double digestion for complex DNA cloning applications.
Area of Science:
- Molecular Biology
- Recombinant DNA Technology
- Genetic Engineering
Background:
- Directional cloning often faces challenges with restriction enzyme digestion due to adjacent or overlapping recognition sites.
- Incomplete digestion of plasmids can occur when the second restriction enzyme cannot access its site because of insufficient double-stranded DNA.
Purpose of the Study:
- To present a user-friendly solution for common problems in directional cloning of DNA fragments into plasmids.
- To introduce an intermediary plasmid strategy that facilitates the use of restriction enzymes with adjacent or overlapping recognition sites.
Main Methods:
- Construction of an intermediary plasmid containing desired restriction sites separated by a positively selectable stuffer (neomycin resistance).
- Utilizing the intermediary plasmid to ensure efficient double digestion for subsequent cloning steps.
Main Results:
- The intermediary plasmid approach successfully overcomes issues with incomplete double digestion of plasmids.
- This method enables efficient directional cloning even when restriction enzyme choices are limited or vectors are complex.
Conclusions:
- The developed intermediary plasmid strategy provides a robust solution for challenging recombinant DNA cloning scenarios.
- This user-friendly approach enhances the efficiency and reliability of directional cloning, particularly in complex vector systems.