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Multiplex PCR

Multiplex PCR is a modification of PCR that uses multiple pairs of primers in a single PCR mixture; the primer pairs being specific to different DNA sequences. By targeting multiple genes at once, a single PCR can provide the information that otherwise would require several times the amount of reagents and take longer to perform.
Molecular Diagnostics
Edited by: Jim Huggett and Justin O'Grady
The application of molecular technology in clinical diagnosis in two key diagnostic areas: cancer and infectious diseases.
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Real-Time PCR
Edited by: Nick A. Saunders and Martin A. Lee
Provides both the novice and experienced user with an invaluable reference to a wide-range of real-time PCR technologies and applications and supplies detailed technical insights into the underlying principles, methods and practice of real-time PCR.
"an invaluable reference" (Doodys); "wide range of real time PCR technologies" (Food Sci Technol Abs) read more ...

The Multiplex PCR Technique

Whereas standard PCR usually uses one pair of primers to amplify a specific sequence, multiplex PCR allows the simultaneous amplification of more than one target sequence in a single reaction by using a set of primers (Rodríguez-Lázaro and Hernández 2013). This saves considerable time and effort, and decreases the number of reactions that need to be performed to detect the desired targets in the sample. The presence of many PCR primers in a single tube can cause some problems, such as the increased formation of misprimed PCR products, ‘primer dimers' , and the amplification discrimination of longer DNA fragments. For multiplex PCR, primers should be chosen with similar annealing temperatures. The lengths of amplified products should be similar; as large differences in the lengths of the target DNAs may favour the amplification of shorter targets over the longer ones, which results in differential yields of amplified products.

Rodríguez-Lázaro, D. and Hernández, M. (2013). Introduction to the Real-time PCR In Real-Time PCR in Food Science: Current Technology and Applications. D. Rodriguez-Lazaro, ed. (Norfolk, UK: Caister Academic Press). ISBN: 978-1-908230-15-7.