A Quick Method to Synthesize Extrachromosomal Circular DNA In Vitro

Area of Science:

• Molecular Biology
• Genomics
• Biochemistry

Background:

• Extrachromosomal circular DNA (eccDNA) plays roles in genomic instability and biological regulation.
• Identifying eccDNA functions is challenging due to difficulties in synthesizing longer molecules.
• Current synthesis methods are often complex, lengthy, and expensive.

Purpose of the Study:

• To develop a novel, rapid, and efficient method for synthesizing extrachromosomal circular DNA (eccDNA).
• To overcome the limitations of existing eccDNA synthesis techniques, particularly for molecules over 1 kb.

Main Methods:

• Introduction of QuickLAMA (Ligase-Assisted Minicircle Accumulation), a PCR and ligation-based approach.
• Synthesis of three eccDNAs (up to 2.6 kb) from cancer tissue and PC3 cells.
• Validation via sequencing and restriction enzyme digestion to confirm successful circularization.

Main Results:

• QuickLAMA enables rapid synthesis of eccDNAs up to 2.6 kb.
• The method is highly efficient, cost-effective, time-efficient, and reproducible.
• Multiple eccDNAs can be synthesized and purified within a single day by a trained molecular biologist.

Conclusions:

• QuickLAMA offers a significant advancement for eccDNA synthesis, overcoming length and complexity barriers.
• The method's ease of standardization and high-throughput potential can accelerate eccDNA research.
• This technique may facilitate the clinical translation of eccDNA discoveries.