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        DNA Extraction from Archival Formalin-fixed, Paraffin-embedded Tissue Sections

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        DNA Extraction from Archival Formalin-fixed, Paraffin-embedded Tissue Sections

        Author: Shi et al.
        Source: Contributed by APostodoc
        Abstract: Describes two methods of extracting DNA from archived, paraffin-embedded sections. One is the standard non-heating enzymatic digestion method; the other is heating method based on the principles of the antigen retrieval technique, which yields better DNA quantity.

         

        Section 1. Non-heating DNA Extraction Protocol

        1. Cut paraffin block at 10 µm and collected in an autoclaved plastic microtube (1.5 ml).
        2. Add 1 ml xylene to the microtube containing tissue sections for 30 min for two changes,
        3. Add 100% and 75% ethanol for 30 min with two changes
        4. Wash with PBS for 15 min with two changes
        5. Add 500 µl of lysis buffer (proteinase K 20 mg/ml, 50 µl, 1 M Tris-HCl solution 10 µl, 0.5 M EDTA 2 µl, 10% SDS 100 µl, and distilled water 838 ml)
        6. Incubated at 52° C overnight until all tissue fragments were dissolved completely
        7. Add 500 µl phenol:chloroform:isopropanol alcohol at 25:24:1 to the de-waxed tissue
        8. Mix by vortex
        9. Centrifugation at RT, 12,000 x g for 10 min
        10. Transfer the supernatant fluid to an autoclaved microtube using a 100-µl pipette
        11. Add one volume of chloroform to the supernatant, mixed by vortexing
        12. Centrifuged at 12,000 x g for 5 min.
        13. Carefully remove the upper aqueous supernatant to another fresh microtube
        14. Adding 0.1 volume of 3 M sodium acetate to the new tube
        15. Mix by vortexing
        16. Add 1 volume of isopropanol, and incubate at -20C overnight.
        17. The precipitated DNA was centrifuged at 12,000 x g at 4C.
        18. Discard the supernatant fluid and wash once with 75% ethanol.
        19. Collect the extracted DNA after further centrifugation.
        20. Dissolve the final yield of DNA in 50 µl distilled water after drying completely in a hood.

         

         

         

        Section 2. Heating Protocol for DNA Extraction

         

        Overview

        Materials and Reagents

        Procedure

         

         

        Reference

        Shi et al, Journal of Histochemistry and Cytochemistry, Vol. 50, 1005-1011, August 2002.

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