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Updated: Jul 5, 2026
13:32
DNA Extraction from Paraffin Embedded Material for Genetic and Epigenetic Analyses
Published on: March 26, 2011
Preparation of DNA from fixed, paraffin-embedded tissue
1righam and Women's Hospital, Boston, Massachusetts, USA.
Current Protocols in Human Genetics
|April 23, 2008
Summary
Purifying DNA from fixed, paraffin-embedded tissue (PET) is challenging but feasible for polymerase chain reaction (PCR) amplification. Two protocols, a rapid basic method and a more thorough alternate method, are presented for DNA extraction from PET.
Area of Science:
- Biochemistry
- Molecular Biology
- Histology
Background:
- DNA extraction from formalin-fixed, paraffin-embedded tissue (FFPE) is crucial for molecular analyses.
- Standard DNA purification methods often struggle with FFPE samples due to cross-linking and embedding media.
- The resulting DNA is typically fragmented and may contain inhibitors.
Purpose of the Study:
- To present optimized protocols for DNA purification from fixed, paraffin-embedded tissue (PET).
- To enable the amplification of short DNA fragments from PET using the polymerase chain reaction (PCR).
- To provide reliable methods for researchers working with archival tissue samples.
Main Methods:
- A Basic Protocol involving minimal steps for rapid DNA purification from PET.
- An Alternate Protocol with additional xylene and phenol/chloroform extractions for challenging samples.
- DNA purification focused on removing paraffin, proteins, and potential inhibitors.
Main Results:
- The Basic Protocol offers a fast method with reduced contamination risk.
- The Alternate Protocol provides a more robust purification, suitable for suboptimal fixation or when the Basic Protocol fails.
- Purified DNA is suitable for PCR amplification of short DNA regions, but not typically for Southern blot analysis.
Conclusions:
- Effective DNA purification from PET is achievable using the described protocols.
- The choice between Basic and Alternate Protocols depends on tissue quality and initial results.
- These methods enhance the utility of FFPE tissues for molecular research, particularly PCR-based assays.
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