Global amplification of mRNA by template-switching PCR: linearity and application to microarray analysis

L Petalidis, S Bhattacharyya, G A Morris, V P Collins, T C Freeman, P A Lyons

Research output: Contribution to journalArticlepeer-review

Abstract

Conventional approaches to target labelling for expression microarray analysis typically require relatively large amounts of total RNA, a serious limitation when the sample available is small. Here we explore the cycle-dependent amplification characteristics of Template-Switching PCR and validate its use for microarray target labelling. TS-PCR identifies up to 80% of the differentially expressed genes identified by direct labelling using 30-fold less input RNA for the amplification, with the equivalent of 1000-fold less starting material being used for each hybridisation. Moreover, the sensitivity of microarray experiments is increased considerably, allowing the identification of differentially expressed transcripts below the level of detection using targets prepared by direct labelling. We have also validated the fidelity of amplification and show that the amplified material faithfully represents the starting mRNA population. This method outperforms conventional labelling strategies, not only in terms of sensitivity and the identification of differentially expressed genes, but it is also faster and less labour intensive than other amplification protocols.
Original languageEnglish
Pages (from-to)e142
JournalNucleic Acids Research
Volume31
Issue number22
DOIs
Publication statusPublished - 15 Nov 2003

Keywords

  • DNA, Complementary
  • Oligonucleotide Array Sequence Analysis
  • RNA, Messenger
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sensitivity and Specificity
  • Templates, Genetic

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