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Methacarn fixation for genomic DNA analysis in microdissected, paraffin-embedded tissue specimens
Chikako Uneyama1, Makoto Shibutani, Naoya Masutomi
1Division of Pathology, National Institute of Health Sciences, Setagaya-ku, Tokyo, Japan.
Summary
Methacarn fixative enables versatile genomic DNA analysis from microdissected paraffin-embedded tissues (PET). This method allows extensive DNA amplification, even from single cells, outperforming traditional formalin fixation.
Area of Science:
- Molecular Biology
- Genomics
- Histology
Background:
- Methacarn is a versatile fixative for RNA and protein analysis in microdissected paraffin-embedded tissue (PET).
- Its efficacy for genomic DNA analysis in such specimens requires further investigation.
Purpose of the Study:
- To evaluate methacarn's performance for genomic DNA analysis in microdissected rat tissues.
- To compare methacarn with formalin for DNA analysis in PET specimens.
Main Methods:
- DNA extraction from 1 mm³ microdissected rat cerebral cortex sections (10 µm thick).
- Nested PCR and single-step PCR for DNA amplification.
- Analysis of DNA amplification from single cells and small cell populations (10-270 cells).
- Assessment of DNA quality and yield after various staining procedures (cresyl violet, hematoxylin and eosin, immunostaining).
Main Results:
- Extensive DNA portions (up to 2.8 kb) were amplified using nested PCR.
- A 522-bp fragment was amplified from single Purkinje cells (20% success rate).
- Minimal cell requirement was 10-20 cells for hippocampal neurons.
- Hematoxylin and eosin staining allowed 522-bp amplification from 150-270 cells.
- Immunostaining reduced DNA yield but allowed 184-bp fragment amplification from 150-270 cells.
Conclusions:
- Methacarn demonstrates superior performance for genomic DNA analysis in microdissected PET specimens compared to formalin.
- Methacarn-fixed tissues support robust DNA amplification across various staining protocols, including single-cell analysis.