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Updated: May 1, 2026
Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
Published on: September 18, 2020
Validation of DNA methylation profiling in formalin-fixed paraffin-embedded samples using the Infinium
Sebastián Moran1, Miguel Vizoso1, Anna Martinez-Cardús1
1Cancer Epigenetics and Biology Program (PEBC); Bellvitge Biomedical Research Institute (IDIBELL); Barcelona, Catalonia, Spain.
Abstract:
A formalin-fixed paraffin-embedded (FFPE) sample usually yields highly degraded DNA, which limits the use of techniques requiring high-quality DNA, such as Infinium Methylation microarrays. To overcome this restriction, we have applied an FFPE restoration procedure consisting of DNA repair and ligation processes in a set of paired fresh-frozen (FF) and FFPE samples. We validated the FFPE results in comparison with matched FF samples, enabling us to use FFPE samples on the Infinium HumanMethylation450 Methylation array.
Insights
Restoring degraded DNA from formalin-fixed paraffin-embedded (FFPE) samples enables their use with Infinium Methylation arrays. This DNA repair and ligation method validates FFPE data against fresh-frozen samples.
Area of Science:
- Molecular Biology
- Genomics
- Epigenetics
Background:
- Formalin-fixed paraffin-embedded (FFPE) samples often contain highly degraded DNA.
- Degraded DNA quality restricts the application of sensitive molecular techniques like Infinium Methylation microarrays.
Purpose of the Study:
- To develop and validate a DNA restoration procedure for FFPE samples.
- To enable the use of FFPE samples for Infinium HumanMethylation450 BeadChip analysis.
Main Methods:
- An FFPE DNA restoration protocol involving DNA repair and ligation was applied.
- Paired fresh-frozen (FF) and FFPE samples were analyzed.
- FFPE sample results were validated against matched FF samples.
Main Results:
- The FFPE restoration procedure successfully improved DNA quality.
- Methylation data from restored FFPE samples were comparable to matched FF samples.
- The Infinium HumanMethylation450 BeadChip assay could be reliably performed on restored FFPE DNA.
Conclusions:
- DNA restoration is effective for analyzing FFPE samples using methylation arrays.
- This method expands the utility of archived FFPE tissues for epigenetic studies.
- FFPE samples can be a valuable resource for high-throughput methylation analysis with appropriate processing.
