Fluorescence in situ hybridization (FISH) technique for the micronucleus test

Area of Science:

• Cytogenetics
• Molecular Biology
• Genetics

Background:

• Molecular cytogenetic techniques have advanced rapidly.
• Fluorescence in situ hybridization (FISH) is a key molecular cytogenetic method.
• FISH detects specific chromosomal rearrangements in various specimen types.

Purpose of the Study:

• To describe the fluorescence in situ hybridization (FISH) methodology.
• To detail the use of FISH with centromeric probes for human cells.
• To combine FISH with the cytokinesis-block micronucleus assay for mutagen discrimination.

Main Methods:

• Utilizing fluorescently labeled DNA probes complementary to specific chromosomal regions.
• Visualizing hybridized probes via fluorescence microscopy in interphase nuclei and metaphase chromosomes.
• Integrating FISH with the cytokinesis-block micronucleus assay.

Main Results:

• The described FISH methodology allows for the detection of specific chromosomal rearrangements.
• The combined FISH and cytokinesis-block micronucleus assay effectively discriminates between mutagens.
• The method differentiates between clastogens (inducing DNA breakage) and aneugens (inducing chromosome loss).

Conclusions:

• The described FISH methodology is a valuable tool in molecular cytogenetics.
• This technique aids in understanding mutagenic mechanisms.
• The FISH-based assay provides a robust method for genotoxicity testing.