Related Experiment Video
Updated: Jun 28, 2026

09:00
Polymerase Chain Reaction: Basic Protocol Plus Troubleshooting and Optimization Strategies
Published on: May 22, 2012
Principles and applications of polymerase chain reaction: basic science for the practicing physician
Faoud T Ishmael1, Cristiana Stellato
1Division of Allergy and Clinical Immunology, Johns Hopkins University, Baltimore, Maryland 21224, USA.
Summary
Polymerase chain reaction (PCR) technology revolutionizes DNA amplification for biomedical research and disease diagnostics. Real-time PCR further enhances gene expression analysis, becoming essential in labs.
Area of Science:
- Molecular Biology
- Medical Diagnostics
Background:
- Polymerase chain reaction (PCR) is a pivotal technology for DNA amplification.
- Its applications span basic biomedical research and clinical diagnostics.
Purpose of the Study:
- To review the technology of polymerase chain reaction (PCR).
- To explore its applications in diagnostic medicine and biomedical research.
Main Methods:
- Literature review of English-language articles from 1985-2007.
- Keywords: polymerase chain reaction, real-time polymerase chain reaction, and applications.
Main Results:
- PCR enables rapid, accurate DNA amplification for gene cloning and manipulation.
- Facilitates diagnosis of genetic, infectious, and oncologic diseases.
- Real-time PCR advances quantification of DNA amplification and gene expression analysis.
Conclusions:
- PCR and real-time PCR have transformed basic science and diagnostic medicine.
- These techniques are indispensable tools in research and clinical laboratories.
More Related Videos
Related Concept Videos
PCR
Overview
PCR - Polymerase Chain Reaction
Overview
Real Time RT-PCR
Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...
The real-time quantification of the number of amplified products is...
Proofreading
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Proofreading
Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
DNA Isolation
DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...

