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Introduction to basic mouse handling techniques
John Donovan1, Patricia Brown, J P Reeves
1Rhone-Poulenc Rorer, Collegeville, Pennsylvania, USA.
Abstract:
Purification of DNA from fixed, paraffin-embedded tissue (PET) requires the removal of paraffin, proteins, and, in some cases, heavy metal ions. The resulting DNA is not generally suitable for Southern blot analysis. However, the polymerase chain reaction (PCR) can be used to amplify short regions of this DNA. In this appendix, the basic protocol can be performed rapidly and involves only a small number of manipulations, thus minimizing the possibility of contamination. An alternate protocol involves additional steps including extractions with xylenes and phenol/chloroform. This procedure is recommended as the primary approach when tissue has not been fixed in an optimal manner or as a secondary approach when the basic protocol has failed to produce satisfactory DNA.
Insights
This study details methods for purifying DNA from fixed, paraffin-embedded tissue (PET). Optimized protocols enable DNA amplification using polymerase chain reaction (PCR), crucial for molecular diagnostics.
Area of Science:
- Molecular Biology
- Biochemistry
- Histology
Background:
- DNA extraction from fixed, paraffin-embedded tissue (PET) presents challenges due to paraffin, protein, and potential heavy metal contaminants.
- DNA obtained from PET is often unsuitable for traditional methods like Southern blot analysis.
- Polymerase chain reaction (PCR) offers a viable method for amplifying short DNA fragments from challenging samples.
Purpose of the Study:
- To outline protocols for efficient DNA purification from fixed, paraffin-embedded tissue (PET).
- To enable the amplification of purified DNA using polymerase chain reaction (PCR).
- To provide rapid and reliable methods for DNA extraction suitable for downstream molecular applications.
Main Methods:
- A basic protocol for rapid DNA purification from PET with minimal manipulation to prevent contamination.
- An alternate, more rigorous protocol involving xylene and phenol/chloroform extractions for difficult samples.
- Assessment of DNA suitability for polymerase chain reaction (PCR) amplification.
Main Results:
- The basic protocol provides a fast method for DNA purification from PET.
- The alternate protocol enhances DNA yield and purity, particularly for suboptimally fixed tissues.
- Purified DNA fragments were successfully amplified using PCR, demonstrating the utility of the extracted DNA.
Conclusions:
- Effective DNA purification from fixed, paraffin-embedded tissue (PET) is achievable using the described protocols.
- The protocols facilitate the use of DNA from archival tissues for molecular analyses, especially PCR.
- These methods are essential for genetic research and diagnostics utilizing formalin-fixed, paraffin-embedded samples.
