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8 - The road from qualitative to quantitative assay: What is next?

Published online by Cambridge University Press:  25 January 2011

By
Michael W. Pfaffl
Edited by
Stephen A. Bustin
Stephen A. Bustin
Affiliation:
Queen Mary University of London
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Summary

The PCR is widely used in many applications throughout the world. It has its secure place in the history of molecular biology as one of the most revolutionary methods ever. The principles of PCR are clear, but how can the reaction procedure be optimized to bring out the best in each assay? What is the status quo and what is next? Where are there areas for improvement?

INTRODUCTION

PCR is defined as a relatively simple heat-stable Taq polymerase–based technique, invented by Kary B. Mullis and coworkers, who were awarded the Nobel Prize for chemistry in 1993 for this discovery. However, this terrain is contested, and many other scientists were instrumental in making PCR work in all kinds of deoxyribonucleic acid (DNA), ribonucleic acid (RNA), and protein (immuno quantitative PCR [qPCR])–based applications. Reverse transcription (RT) followed by PCR represents a powerful tool for messenger RNA (mRNA) quantification. Nowadays, real-time RT–PCR is widely and increasingly used because of its high sensitivity, good reproducibility, and wide dynamic quantification range. Today, quantitative real-time RT–PCR (qRT–PCR) represents the most sensitive method for the detection and quantification of gene expression levels. It has its tremendous advantages in elucidating small changes in mRNA expression levels in samples with low RNA concentrations, from limited tissue samples and in single cell analysis. Sensitivity and reproducibility is a particular requirement of expression profiling, which focuses on the fully quantitative approach for mRNA quantification, rather than simply qualitative analysis.

Type
Chapter
Information
The PCR Revolution
Basic Technologies and Applications
 , pp. 110 - 128
Publisher: Cambridge University Press
Print publication year: 2009

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