Competitive priming PCR: a versatile method to generate cohesive terminus.

Area of Science:

• Molecular Biology
• Biotechnology
• Genomics

Background:

• Post-genomic research requires detailed protein function analysis, often necessitating expression vector construction.
• Traditional DNA recombination methods using PCR, digestion, and ligation have limitations, including restriction enzyme dependency and undesired base additions.

Purpose of the Study:

• To introduce a novel PCR-based gene synthesis method, competitive priming PCR (CP-PCR), for efficient expression vector assembly.
• To demonstrate the feasibility of CP-PCR for directed cloning with minimal or no digestion steps.

Main Methods:

• Competitive priming PCR (CP-PCR) was employed using specifically designed competitive sense primers for target sequence amplification.
• PCR products underwent single digestion (PstI) and ligation with a linearized vector (pCMV-BD).
• Reconstructed plasmids were validated by sequencing, and fusion protein expression was confirmed via western blot.

Main Results:

• CP-PCR efficiently assembled a plasmid expressing a fusion protein (fibrinogen alpha chain and galactose transcription factor binding domain).
• The method demonstrated precision and convenience comparable to traditional techniques.
• CP-PCR enables the generation of cohesive termini suitable for recombination, potentially achieving "seamless" DNA assembly.

Conclusions:

• CP-PCR offers a versatile and efficient strategy for DNA recombination and expression vector construction.
• This method overcomes limitations of traditional approaches, allowing for greater flexibility in cloning strategies.
• CP-PCR facilitates streamlined gene cloning and protein expression, advancing functional genomics research.