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Multi-colour brightfield in situ hybridisation on tissue sections
A H Hopman1, S Claessen, E J Speel
1Department of Molecular Cell Biology and Genetics, University Maastricht, The Netherlands. Hopman@molcelb.unimaas.nl
Histochemistry and Cell Biology
|December 5, 1997
Summary
This study presents a novel brightfield microscopy method for detecting multiple DNA targets simultaneously in cells and tissues using enzyme cytochemistry. The optimized technique enhances accuracy and stability for in situ hybridization applications.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Simultaneous detection of multiple DNA targets is crucial for understanding complex biological processes.
- Existing enzyme cytochemistry methods for multiple DNA target detection face limitations in stability and accuracy, especially in tissue sections.
Purpose of the Study:
- To develop and optimize a brightfield microscopical method for simultaneous detection of multiple DNA target sequences.
- To improve the stability and contrast of enzyme precipitates for accurate in situ hybridization (ISH) in both cell and tissue preparations.
Main Methods:
- Simultaneous hybridization of chromosome-specific DNA probes labeled with biotin, digoxigenin, or fluorescein.
- Enzyme cytochemistry using horseradish peroxidase (PO) and alkaline phosphatase (APase) reactions with specific substrates (DAB, FR, TMB, NF).
- Optimization of enzyme precipitate stability and reaction sequences for triple-color detection in cell and tissue preparations, including protein embedding and modified washing steps.
Main Results:
- Successful triple-color detection (brown, red, green) of DNA targets in single cell preparations using PO/DAB, APase/FR, and PO/TMB.
- Adaptations for tissue sections included replacing APase/FR with APase/NF and modifying PO/TMB detection and antibody application order.
- The optimized method yielded stable, well-contrasting precipitates, enabling direct mounting and optional protein layer embedding for enhanced stability.
Conclusions:
- The developed brightfield microscopical method provides accurate and stable detection of multiple DNA targets in various biological preparations.
- The optimized protocol overcomes limitations of previous methods, offering improved efficiency and reliability for complex in situ hybridization applications.