Related Experiment Video
Updated: Jun 4, 2026
Retrospective MicroRNA Sequencing: Complementary DNA Library Preparation Protocol Using Formalin-fixed Paraffin-embedded RNA Specimens
Published on: May 5, 2018
MicroRNA isolation from formalin-fixed, paraffin-embedded tissues
1University of Pennsylvania School of Medicine, Philadelphia, PA, USA.
Abstract:
MicroRNAs (miRNAs) are small (19-23nt), highly conserved noncoding RNAs that posttranscriptionally regulate target gene expression. Altered expression of miRNAs has been demonstrated in many different human diseases, including cancer. The large archives of formalin-fixed, paraffin-embedded (FFPE) tissue specimens with clinical follow-up information that exist are a highly valuable source of tissue to study human diseases. However, RNA in the FFPE tissue is fragmented and may be chemically modified. In this study, we prepared miRNA preserving total RNA from matched pairs of FFPE and respective fresh-frozen clinical samples, and used that in microarray experiments to compare miRNA expression profiles between FFPE and fresh-frozen tissue from the same tissue samples. We demonstrate that miRNA expression profile from FFPE tissues closely resembles that from fresh tissues. These results underscore the suitability of FFPE tissues as appropriate resources for miRNA expression analyses.
Insights
Formalin-fixed, paraffin-embedded (FFPE) tissues are suitable for microRNA (miRNA) expression analysis. miRNA profiles from FFPE samples closely match those from fresh-frozen tissues, validating FFPE utility.
Area of Science:
- Molecular Biology
- Genomics
- Biotechnology
Background:
- MicroRNAs (miRNAs) are crucial noncoding RNAs regulating gene expression.
- Aberrant miRNA expression is linked to various human diseases, including cancer.
- Formalin-fixed, paraffin-embedded (FFPE) tissues are abundant but RNA quality is a concern.
Purpose of the Study:
- To assess the suitability of FFPE tissues for miRNA expression profiling.
- To compare miRNA expression profiles between FFPE and fresh-frozen tissues.
- To validate FFPE tissues as a resource for miRNA research.
Main Methods:
- RNA extraction from matched FFPE and fresh-frozen clinical tissue samples.
- Microarray analysis to compare miRNA expression profiles.
- Comparative analysis of miRNA expression data.
Main Results:
- miRNA expression profiles from FFPE tissues closely resemble those from fresh-frozen tissues.
- High correlation observed between miRNA expression in FFPE and fresh samples.
- FFPE tissues yield reliable miRNA expression data.
Conclusions:
- FFPE tissues are a valuable and appropriate resource for miRNA expression analyses.
- The study validates the use of archived FFPE samples for miRNA research.
- Findings support the utility of FFPE tissues in disease-related miRNA studies.
