A novel method to convert a DNA fragment inserted into a plasmid to an inverted repeat structure

Area of Science:

• Molecular Biology
• Gene Expression Regulation
• Biotechnology

Background:

• DNA vector-based RNA interference (RNAi) utilizes inverted repeat (IR) DNA to overexpress hairpin RNA, suppressing target gene expression.
• This method is crucial for characterizing gene function in cell culture models.

Purpose of the Study:

• To develop a new method for converting inserted DNA fragments (IDF) into IR structures within plasmid vectors.
• To establish efficient techniques for constructing long hairpin RNA (lhRNA) expression plasmids for gene silencing.

Main Methods:

• Utilized nicking endonucleases and BcaBEST DNA polymerase to convert IDFs into IR DNA.
• Involved plasmid linearization, hairpin-loop formation, nicking, strand displacement synthesis, and self-ligation.
• Developed a purification method for expression plasmids containing IR DNA.

Main Results:

• Successfully constructed IR DNA-containing expression plasmids that induce target-specific RNAi in silkworm cells.
• Demonstrated the efficacy of the novel method in generating functional lhRNA expression plasmids.
• Established a robust methodology for creating lhRNA expression libraries from cDNA libraries.

Conclusions:

• The developed methods provide efficient techniques for constructing lhRNA expression plasmids for gene silencing in silkworms and other organisms.
• Offers a foundational methodology for building lhRNA expression libraries from cDNA plasmid libraries.
• Facilitates advanced research in functional genomics and gene regulation.