Cloning with tandem gene systems for high level gene expression.

Area of Science:

• Molecular Biology
• Genetic Engineering
• Biotechnology

Background:

• Traditional gene cloning into plasmids increases plasmid size proportionally to the number of gene copies.
• This size increase can complicate plasmid maintenance and transformation efficiency in genetic engineering.

Purpose of the Study:

• To develop a method for increasing gene copy number within plasmids.
• To minimize the overall size of engineered plasmids for improved utility.
• To explore applications in genetic engineering.

Main Methods:

• Constructed plasmids utilizing a polycistronic operon concept.
• Sandwiched multiple structural genes (human leukocyte interferon genes) between a single promoter and terminator.
• Incorporated individual ribosome binding sites for each gene within the polycistronic structure.

Main Results:

• Successfully created plasmids with 1 to 4 human leukocyte interferon genes.
• Demonstrated a method to increase gene copy number while reducing plasmid size compared to traditional cloning.
• The polycistronic approach saved space equivalent to multiple promoters and terminators.

Conclusions:

• The developed method effectively increases gene copy number and minimizes plasmid size.
• This strategy offers significant advantages for genetic engineering applications.
• The polycistronic gene expression system is a viable tool for efficient gene cloning.