Book contents
- Frontmatter
- Contents
- List of contributors
- Foreword by Sidney Altman
- Foreword by Victor R. Ambros
- Introduction
- I Discovery of microRNAs in various organisms
- II MicroRNA functions and RNAi-mediated pathways
- III Computational biology of microRNAs
- IV Detection and quantitation of microRNAs
- 17 Detection and analysis of microRNAs using LNA (locked nucleic acid)-modified probes
- 18 Detection and quantitation of microRNAs using the RNA Invader® assay
- 19 A single molecule method to quantify miRNA gene expression
- 20 Real-time quantification of microRNAs by TaqMan® assays
- 21 Real-time quantification of miRNAs and mRNAs employing universal reverse transcription
- V MicroRNAs in disease biology
- VI MicroRNAs in stem cell development
- Index
- Plate section
- References
21 - Real-time quantification of miRNAs and mRNAs employing universal reverse transcription
from IV - Detection and quantitation of microRNAs
Published online by Cambridge University Press: 22 August 2009
- Frontmatter
- Contents
- List of contributors
- Foreword by Sidney Altman
- Foreword by Victor R. Ambros
- Introduction
- I Discovery of microRNAs in various organisms
- II MicroRNA functions and RNAi-mediated pathways
- III Computational biology of microRNAs
- IV Detection and quantitation of microRNAs
- 17 Detection and analysis of microRNAs using LNA (locked nucleic acid)-modified probes
- 18 Detection and quantitation of microRNAs using the RNA Invader® assay
- 19 A single molecule method to quantify miRNA gene expression
- 20 Real-time quantification of microRNAs by TaqMan® assays
- 21 Real-time quantification of miRNAs and mRNAs employing universal reverse transcription
- V MicroRNAs in disease biology
- VI MicroRNAs in stem cell development
- Index
- Plate section
- References
Summary
Introduction
MicroRNAs have been identified as a new level of eukaryotic gene regulation. These endogenous ∼22 nucleotide (nt) sequences are variably expressed in a manner that is specific to cell types, developmental stages and diseases (such as cancer). Because of their small size and variable expression levels, detection and quantification is technically challenging; various techniques have been developed to address these issues. We have modified a technique originally designed to specifically amplify mRNA and exclude pseudogene co-amplification to the real-time quantification of miRNAs. The modified technique involves the enzymatic addition of a polyA tail and the sequential hybridization of a universal RT-primer followed by reverse transcription. Transcript-specific forward primers can then be used to amplify a number of miRNAs as well as mRNA, from the same sample. We have used this technique to quantify relative miRNA expression using GAPDH mRNA as an internal standard. Relative quantification against a ubiquitously expressed miRNA, or multiplexing, is also possible, as all miRNAs in a sample are reverse transcribed. In addition, the relative quantification of both a miRNA and its predicted mRNA target can be assessed in the same sample. This allows identification of miRNA/mRNA interaction that results in cleavage or degradation of the target. The method is straightforward, needs no RNA size fractionation and involves routine enzymatic manipulations.
- Type
- Chapter
- Information
- MicroRNAsFrom Basic Science to Disease Biology, pp. 283 - 292Publisher: Cambridge University PressPrint publication year: 2007
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