Polymerase chain reaction (PCR) is a molecular biology technique used to amplify specific DNA sequences through repeated cycles of denaturation, primer annealing, and extension by a thermostable DNA polymerase. The technology enables sensitive detection, cloning, and analysis of genetic material from diverse samples. Conventional PCR typically provides endpoint amplification and product visualization by gel electrophoresis. Quantitative PCR (qPCR) incorporates fluorescent detection to monitor amplification in real time and quantify target DNA or RNA levels. Digital PCR partitions reactions into thousands of individual assays to enable absolute quantification of nucleic acids with high precision and sensitivity compared with traditional PCR methods.
Quantitative PCR (qPCR) is a type of PCR that allows the user to monitor DNA quantity in real time. To do so, qPCR uses a comparative approach, providing quantitative measurements relative to another target, often a reference gene of stable expression. qPCR is often called real-time PCR, and thus it can be confused with RT-PCR. It is important to note that RT-PCR should only be used for reverse transcription PCR, and the term RT-qPCR indicates reverse transcription qPCR (the most common type of qPCR, as it can be used to measure changes in gene expression).
Digital PCR (dPCR) is a powerful, highly sensitive technique that partitions samples into thousands of tiny reactions to deliver precise, absolute quantification of nucleic acids. This resource covers dPCR basics, compares its advantages over qPCR, and showcases its diverse applications in research and diagnostics. The number one cause of dPCR experiment failure is poor assay design, which makes careful planning essential. So an overview of platform choices, workflow optimization tips, and data analysis best practices are also provided to help you generate reliable, reproducible measurements to advance your research.