Protocol for chromosome-specific probe construction using PRINS, micromanipulation and DOP-PCR techniques.

Area of Science:

• Molecular Cytogenetics
• Genetics
• Biotechnology

Background:

• Chromosome-specific probes are essential tools in molecular cytogenetics.
• Existing methods for probe generation can be complex or lack reproducibility.
• Developing efficient and reliable protocols for probe construction is crucial for advancing cytogenetic research.

Purpose of the Study:

• To establish a reproducible protocol for generating chromosome-specific probes.
• To combine primer in situ amplification (PRINS), micromanipulation, and degenerate oligonucleotide-primed PCR (DOP-PCR) for probe construction.
• To validate the utility of the generated probes in fluorescent in situ hybridization (FISH).

Main Methods:

• Human lymphocyte cultures were used to obtain metaphase chromosomes.
• Primer in situ amplification (PRINS) was employed for chromosome amplification.
• Subcentromeric fragments of the X chromosome were microdissected using micromanipulation.
• Degenerate oligonucleotide-primed PCR (DOP-PCR) was used to amplify microdissected fragments.
• Probes were labeled with tetramethyl-rhodamine-5-dUTP for visualization.

Main Results:

• A novel, reproducible protocol for constructing chromosome-specific probes was successfully developed.
• The generated X chromosome probes effectively hybridized to target regions.
• Fluorescent in situ hybridization (FISH) revealed distinct signals: one red spot in male X chromosomes and two in female X chromosomes, including interphase nuclei.

Conclusions:

• The integrated PRINS, micromanipulation, and DOP-PCR method provides a robust approach for generating chromosome-specific probes.
• This protocol enables precise targeting and visualization of specific chromosomal regions, such as the X chromosome.
• The developed probes are effective for cytogenetic analysis, aiding in the identification of chromosomal differences between sexes.