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A modified fluorescence in situ hybridization (FISH) technique
A S Multani1, V L Hopwood, S Pathak
1Department of Cell Biology, University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.
Abstract:
We have modified and shortened the routine fluorescence in situ hybridization (FISH) technique by using microwave or formalin pretreatment for artificially aging and microwave heating only for dehydrating the regular chromosome preparations. The all-human telomere probe (Oncor, Inc., Gaithersburg, MD) was used on murine K-1735 clone X-21 melanoma cells for this purpose. The intensity of signals obtained by our modified technique(s) was comparable to that obtained by the routine procedure. However, pretreatment of slides with hydrogen peroxide (H2O2) completely obliterates the FISH signals.
Insights
We modified the fluorescence in situ hybridization (FISH) technique using microwave or formalin pretreatment, achieving comparable signal intensity to the routine method. Hydrogen peroxide pretreatment, however, completely eliminated FISH signals.
Area of Science:
- Molecular Biology
- Cytogenetics
- Biotechnology
Background:
- Fluorescence in situ hybridization (FISH) is a crucial technique for detecting specific DNA sequences in chromosomes.
- Traditional FISH protocols can be time-consuming and require optimization for specific applications.
- Accelerating FISH procedures is desirable for increased throughput in research and diagnostics.
Purpose of the Study:
- To modify and shorten the standard fluorescence in situ hybridization (FISH) technique.
- To evaluate the efficacy of microwave and formalin pretreatment for chromosome preparation.
- To assess the impact of hydrogen peroxide pretreatment on FISH signal intensity.
Main Methods:
- Modified the routine FISH technique using microwave or formalin pretreatment for artificial aging.
- Employed microwave heating solely for dehydration of chromosome preparations.
- Utilized an all-human telomere probe on murine K-1735 melanoma cells.
- Investigated the effect of hydrogen peroxide (H2O2) pretreatment on FISH signals.
Main Results:
- The modified FISH technique, employing microwave or formalin pretreatment, yielded signal intensities comparable to the routine procedure.
- Microwave heating for dehydration effectively replaced standard dehydration steps.
- Pretreatment with hydrogen peroxide (H2O2) completely abolished FISH signals, indicating its detrimental effect.
Conclusions:
- Shortened FISH protocols using microwave or formalin pretreatment are effective and maintain signal quality.
- Hydrogen peroxide pretreatment is incompatible with this modified FISH technique and should be avoided.
- These modifications offer a faster and potentially more efficient approach to FISH analysis.