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Optimization of Fast-FISH for alpha-satellite DNA probes
1Institute of Applied Physics, University of Heidelberg, Germany.
Journal of Biochemical and Biophysical Methods
|October 15, 1996
Summary
Fast-fluorescence in situ hybridization (Fast-FISH) offers efficient quantitative microscopy by reducing chemical agents and washing steps. Optimized conditions clearly distinguish major and minor binding sites for chromosome-specific DNA probes.
Area of Science:
- Molecular Biology
- Cytogenetics
- Microscopy
Background:
- Fast-fluorescence in situ hybridization (Fast-FISH) is suitable for quantitative microscopy of repetitive DNA.
- Omitting denaturing chemicals shortens hybridization time and reduces washing steps.
Purpose of the Study:
- Optimize Fast-FISH renaturation conditions for reproducibility.
- Determine optimal hybridization parameters for chromosome 1 and X alpha-satellite probes.
Main Methods:
- Utilized a programmable thermal-cycler for thermal de- and renaturation.
- Applied quantitative fluorescence microscopy to assess binding sites.
- Tested two commercially available alpha-satellite DNA probes.
Main Results:
- Optimized conditions for Boehringer chromosome-1 probe: 72°C for 60 min.
- Optimized conditions for Oncor chromosome-X probe: 74°C for 60 min.
- Clearly discriminated major from minor binding sites in metaphase and interphase cells.
Conclusions:
- Optimized Fast-FISH provides reproducible and clear discrimination of DNA binding sites.
- Established specific hybridization parameters for chromosome 1 and X probes.
- Fast-FISH is a valuable tool for quantitative analysis of repetitive DNA sequences.