Pcr Validation
Pcr Validation - Related Videos
09:57
Development and Validation of a Quantitative PCR Method for Equid Herpesvirus-2 Diagnostics in Respiratory Fluids
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Cited by 11 •
2016
Here, we present a protocol for the development and validation of a quantitative PCR method used for the detection and quantification of EHV-2 DNA in equine respiratory fluids. The EHV-2 qRT-PCR validation protocol involves a three-part procedure: development, characterization of qRT-PCR assay alone, and characterization of the whole analytical method.
01:29
Reliability and Validity
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2020
Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways. Unfortunately, being consistent in measurement does not necessarily mean that you have measured something correctly. To illustrate this concept, consider a kitchen...
08:51
Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
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Cited by 9 •
2016
Here, ribosomal spacer PCR (RS-PCR) is used together with a miniaturized electrophoresis system as a fast and high resolution method for genotyping S. aureus at moderate costs allowing a high throughput.
03:41
Agarose Gel Electrophoresis of DNA Amplicons Post PCR: A Method to Analyze Products of Multiplex PCR and Evaluate PCR Reaction Success
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2025
In this video, we demonstrate the separation of bacterial PCR-amplified DNA using agarose gel electrophoresis. Agarose gel functions as a molecular sieve, enabling the negatively-charged DNA to migrate based upon their size under an applied electric field.
13:27
PCR: The Polymerase Chain Reaction
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2023
The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling – cyles of temperature changes at fixed time intervals. Using a thermostable DNA polymerase, PCR can create numerous copies of DNA from DNA building blocks called dNTPs. There are three steps in PCR: denaturation, annealing, and elongation. Denaturation is the first step in the cycle and causes the DNA to melt by disrupting hydrogen bonds between the bases resulting in single-stranded DNA. Annealing...
FAQs
Specificity testing asks whether the amplification signal comes from the intended amplicon rather than nonspecific products. Positive controls show that the reaction can detect the target, while negative controls help reveal contamination or signal generated without the target. This distinction matters because an apparently strong result can still be misleading if the assay amplifies unintended nucleic acid.
These measures describe different aspects of assay performance. Efficiency indicates how effectively the reaction amplifies its target, sensitivity reflects its ability to detect the target, and reproducibility shows whether comparable results occur across replicate reactions. Examining them together helps determine whether a PCR assay produces dependable signals rather than results that vary because of limited detection or inconsistent amplification.
Quantitative PCR validation adds standard curves and melting-curve analysis to the broader assessment. A standard curve supports evaluation of the relationship between target quantity and measured amplification, while melting-curve analysis helps examine whether the reaction produced the expected amplification behavior. These checks strengthen interpretation when the assay is used to quantify nucleic acid rather than simply detect it.
A basic validation workflow includes appropriate positive and negative controls, replicate reactions, and performance checks for specificity, efficiency, sensitivity, and reproducibility. Quantitative assays additionally use standard curves and melting-curve analysis. Reviewing these results together can expose contamination, nonspecific products, or inconsistent amplification before the assay is applied to biological samples or used for downstream interpretation.
Validated PCR assays support several biological applications, including pathogen detection, genotyping, gene expression analysis, cloning, and diagnostic research. The relevant performance emphasis may differ by purpose: detection requires confidence that the target is recognized, whereas quantitative work also requires dependable measurement. Validation therefore provides a basis for choosing the assay for a particular experimental or research context.
Researchers should consider whether controls behaved appropriately and whether specificity, efficiency, sensitivity, and reproducibility met the needs of the intended application. Signals associated with nonspecific products, contamination, or inconsistent replicate results weaken confidence in the biological interpretation. A satisfactory validation profile supports using the observed amplification for downstream conclusions, such as identifying a pathogen or comparing gene expression.