Polymerase Chain Reaction (PCR)

Polymerase Chain Reaction (PCR) is a molecular biology technique that amplifies specific DNA sequences exponentially, enabling detection and analysis of minute genetic material quantities with exceptional precision. This revolutionary method, invented in 1983 and awarded the Nobel Prize in Chemistry, has become an indispensable tool across biopharmaceutical development, quality control, and diagnostic applications.

PCR operates through repeated cycles of heating and cooling that denature DNA strands, allow primers to bind target sequences, and enable DNA polymerase enzymes to synthesise new complementary strands, generating millions of copies from a single DNA molecule. Variations including quantitative PCR, reverse transcription PCR, and digital PCR provide increasingly sophisticated capabilities for measuring gene expression, detecting pathogens, and identifying genetic mutations. The biopharmaceutical industry relies extensively on PCR throughout product lifecycles, with manufacturers employing PCR-based assays to verify cell line identity, detect adventitious agents in biologics production, and monitor viral clearance during purification. Advanced PCR platforms offer automation, miniaturisation, and multiplexing capabilities enhancing throughput while reducing costs, ensuring this foundational technology continues driving innovation.