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Open Access Highly Accessed Research article

Improved RNA quality and TaqMan® Pre-amplification method (PreAmp) to enhance expression analysis from formalin fixed paraffin embedded (FFPE) materials

Jinghuan Li1, Paul Smyth1, Susanne Cahill1, Karen Denning1, Richard Flavin1, Sinead Aherne1, Marco Pirotta2, Simone M Guenther2, John J O'Leary1 and Orla Sheils1*

Author Affiliations

1 Deptment of Histopathology, University of Dublin, Trinity College, Dublin, Ireland

2 Applied Biosystems, Foster City, CA, USA

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BMC Biotechnology 2008, 8:10  doi:10.1186/1472-6750-8-10

Published: 6 February 2008

Abstract

Background

Archival formalin-fixed paraffin-embedded (FFPE) tissues represent an abundant source of clinical specimens; however their use is limited in applications involving analysis of gene expression due to RNA degradation and modification during fixation and processing. This study improved the quality of RNA extracted from FFPE by introducing a heating step into the selected extraction protocols. Further, it evaluated a novel pre-amplification system (PreAmp) designed to enhance expression analysis from tissue samples using assays with a range of amplicon size (62–164 bp).

Results

Results from the Bioanalyzer and TaqMan® data showed improvement of RNA quality extracted using the modified protocols from FFPE. Incubation at 70°C for 20 minutes was determined to be the best condition of those tested to disrupt cross-links while not compromising RNA integrity. TaqMan® detection was influenced by master mix, amplicon size and the incorporation of a pre-amplification step. TaqMan® PreAmp consistently achieved decreased CT values in both snap frozen and FFPE aliquots compared with no pre-amplification.

Conclusion

Modification to extraction protocols has facilitated procurement of RNA that may be successfully amplified using QRT-PCR. TaqMan® PreAmp system is a robust and practical solution to limited quantities of RNA from FFPE extracts.