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Variability in beta-globin and HPV DNA amplification by PCR from fixed tissues
J S Park1, J F Leake, B K Sharma
1Department of Gynecology and Obstetrics, Johns Hopkins Medical Institutions, Baltimore, Maryland.
Summary
Paraffin-embedded tissue fixation impacts polymerase chain reaction (PCR) success for beta-globin and human papillomaviruses (HPV) DNA amplification. Buffered formalin and Bouin's solution offer high amplification rates, crucial for archival research.
Area of Science:
- Molecular Biology
- Histopathology
- Genetics
Background:
- Paraffin embedding is a common method for preserving biological tissues.
- Polymerase chain reaction (PCR) is widely used for DNA amplification in molecular diagnostics and research.
- The efficacy of PCR can be influenced by tissue fixation and storage conditions.
Purpose of the Study:
- To evaluate the impact of different fixatives on DNA amplification of beta-globin and human papillomaviruses (HPV) from paraffin-embedded tissues.
- To assess the influence of storage duration on DNA amplification from archival specimens.
- To determine optimal conditions for molecular analysis of historical tissue samples.
Main Methods:
- Paraffin-embedded tissues from various sources, treated with different fixatives, were analyzed.
- Beta-globin and HPV DNA amplification were performed using polymerase chain reaction (PCR).
- Amplification efficiency was assessed based on fixative type, storage time, and target DNA sequence size.
Main Results:
- High beta-globin amplification rates (87%-93%) were achieved with buffered formalin, Bouin's, and Hartmann's solutions.
- Low beta-globin amplification rates were observed with Hollande's solution (7%) and Hartmann's solution with eosin (33%).
- HPV was detected in 17% of globin-negative and 43% of globin-positive tissues; HPV-16 amplification was more efficient with smaller DNA targets.
Conclusions:
- Fixative type significantly affects DNA amplification efficiency in paraffin-embedded tissues.
- Storage duration did not negatively impact beta-globin amplification rates in archival tissues.
- Optimizing amplification conditions is essential for reliable molecular studies on archival material, considering fixative variability and other factors.