Choosing the right PCR method for your experiment

In this Mol Bio Minutes mini-episode of Speaking of Mol Bio, Dr. Andrea Hunger walks listeners through the practical differences between three core PCR approaches: endpoint PCR, quantitative PCR (qPCR), and digital PCR. Drawing on her experience in both academic research and industry, she explains how each technique provides different types of information and why choosing the right one depends on the biological question being asked.

Endpoint PCR is the simplest method and is ideal for basic presence-or-absence questions such as confirming cloning success or genotyping samples. While fast and accessible, it does not provide quantitative information. For experiments requiring measurement of gene expression levels or comparisons between samples, qPCR offers a powerful solution by monitoring amplification in real time and using Ct values and standard curves to estimate starting concentrations.

Hunger then discusses digital PCR, a newer technology that partitions samples into many micro-reactions to enable highly precise, absolute quantification of nucleic acids. Because it counts positive and negative partitions directly, digital PCR is especially valuable for detecting rare mutations, low-abundance targets, and applications like liquid biopsy analysis. Ultimately, she emphasizes that these PCR approaches are complementary tools, and the best experimental strategy is to choose the method that provides the level of information required for the next step in a research workflow.

Helpful resource links mentioned in this episode:

• Access educational eBook covering all three types of PCR and their use in gene expression analysis.
• Watch a video on when to choose digital vs. real-time PCR.
• Use the PCR primer design tool from Thermo Fisher.
• Access Harvard’s PrimerBank, a public resource of PCR primers.

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