An efficient procedure for the recovery of DNA from formalin-fixed paraffin-embedded tissue sections

Area of Science:

• Molecular Biology
• Genomics
• Biochemistry

Background:

• Retrieving DNA from formalin-fixed paraffin-embedded (FFPE) tissues is crucial for molecular diagnostics but often yields low-quality and insufficient DNA.
• Existing DNA extraction methods from FFPE tissues require significant improvements for efficiency and reliability.

Purpose of the Study:

• To establish an optimized and efficient method for DNA purification from FFPE specimens.
• To enhance DNA yield and quality for improved downstream molecular analyses, including next-generation sequencing.

Main Methods:

• Optimized incubation temperature, time, and tris(hydroxymethyl)aminomethane (Tris) concentration for reverse-crosslinking.
• Developed a novel method named
• Highly concentrated Tris-mediated DNA extraction
• (HiTE).

Main Results:

• HiTE yielded three times more DNA per tissue slice compared to a representative commercial kit.
• HiTE-extracted DNA resulted in a three-fold increase in sequencing library yield, with higher reproducibility and longer insert sizes.
• Sequencing reads from HiTE-extracted DNA showed even coverage across the reference genome.

Conclusions:

• The HiTE method provides a highly efficient and practical approach for DNA extraction from FFPE tissues.
• HiTE-extracted DNA is suitable for various downstream applications, including whole-genome and targeted gene panel sequencing.
• This optimized method addresses the limitations of current FFPE DNA extraction techniques, facilitating advanced molecular diagnostics.