Multicolor 3D fluorescence in situ hybridization for imaging interphase chromosomes

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Fluorescence in situ hybridization (FISH) is crucial for chromosome analysis and DNA segment localization.
• 3D-FISH, combined with 3D microscopy, analyzes spatial DNA arrangement within nuclei.
• New confocal microscopes allow multicolor 3D-FISH for simultaneous multi-target visualization.

Purpose of the Study:

• To provide protocols for multicolor 3D-FISH using complex DNA probe sets.
• To detail 3D-FISH applications on cultured cells and tissue sections.
• To present protocols for 3D immuno-FISH.

Main Methods:

• Preparation of complex DNA-probe sets for up to six fluorochromes.
• Application of 3D-FISH on cultured mammalian cells (suspension and adherent).
• Adaptation of 3D-FISH for tissue sections and 3D immuno-FISH.

Main Results:

• Enables simultaneous delineation of numerous labeled nuclear targets.
• Facilitates analysis of spatial interrelationships between DNA sequences in individual nuclei.
• Achieves high probe accessibility while preserving nuclear structure.

Conclusions:

• Multicolor 3D-FISH offers advanced capabilities for nuclear spatial organization studies.
• Protocols are optimized for probe quality, fixation, and cell pretreatment.
• This technique enhances understanding of nuclear architecture and DNA sequence organization.