Evaluation and validation of total RNA extraction methods for microRNA expression analyses in formalin-fixed, paraffin-embedded tissues.

The Journal of Molecular Diagnostics : JMD
Martina DoleshalAnna E Szafranska

Abstract

Histopathology archives of well-annotated formalin-fixed, paraffin-embedded (FFPE) tissue specimens are valuable resources for retrospective studies of human diseases. Since recovery of quality intact mRNA compatible with molecular techniques is often difficult due to degradation, we evaluated microRNA (miRNA), a novel class of small RNA molecules with growing therapeutic and diagnostic potential, as an alternative analyte for gene expression studies of FFPE samples. Analyzing total RNA yield, miRNA recovery, and robustness of real-time polymerase chain reaction for miRNA, mRNA, and rRNA species, we compared the performance of commercially available RNA isolation kits and identified a preferred methodology. We further implemented modifications to increase tissue throughput and incorporate a quantitative Armored RNA process control to monitor RNA recovery efficiency. The optimized process was tested for reproducibility as well as interoperator and interday variability, and was validated with a set of 30 clinical samples. In addition, we demonstrated that, independent of FFPE block age and RNA quality, miRNAs generate quantitative reverse transcription-polymerase chain reaction signals that are more robust and better correlate wi...Continue Reading

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