Convenient plasmid for extrachromosomal DNA recombination in mouse cells

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• DNA recombination assays are crucial for understanding genetic stability and diversity.
• Existing methods often suffer from high background noise, complicating analysis.
• Efficient tools are needed for studying complex recombination processes like V(D)J and homologous recombination.

Purpose of the Study:

• To develop a novel, convenient plasmid vector for DNA recombination assays.
• To enhance the efficiency and accuracy of detecting V(D)J and homologous recombination.
• To reduce background noise in recombination assays for clearer results.

Main Methods:

• Construction of the pMR1 plasmid featuring a double prokaryotic terminator and unique restriction sites.
• Adaptation of the pMR1 plasmid for V(D)J recombination and homologous recombination assays.
• Selection of bacterial cells containing recombined plasmid DNA on selective media (ampicillin and chloramphenicol).
• Detection of recombination events in a murine PreB cell line.

Main Results:

• The pMR1 plasmid demonstrated effective reduction of background noise due to its double prokaryotic terminator.
• Both V(D)J recombination and homologous recombination were successfully detected using the pMR1 vector.
• The assay allowed for clear selection of recombined clones on selective plates.

Conclusions:

• The pMR1 plasmid is a convenient and effective tool for analyzing homologous and non-homologous recombination.
• The double terminator significantly improves the signal-to-noise ratio in recombination assays.
• This vector facilitates the study of critical genetic recombination processes in cellular systems.