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Rapid and Efficient FISH using Pre-Labeled Oligomer Probes.

Nomar Espinosa Waminal1,2, Remnyl Joyce Pellerin1, Nam-Soo Kim3

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We developed a rapid Fluorescence in situ hybridization (FISH) technique using pre-labeled oligonucleotide probes (PLOPs). This simplified method significantly reduces hybridization time for DNA element visualization in genomes.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cytogenetics

Background:

  • Fluorescence in situ hybridization (FISH) is crucial for visualizing DNA distribution within genomes.
  • Traditional FISH methods are time-consuming, often requiring 1-2 days for completion.
  • There is a need for faster, more efficient FISH techniques for routine genomic analysis.

Purpose of the Study:

  • To develop and validate a simplified, rapid FISH technique using pre-labeled oligonucleotide probes (PLOPs).
  • To assess the efficiency and applicability of PLOP-FISH for various genomic targets, including rDNA, telomeres, and specific tandem repeats.
  • To reduce the FISH hybridization time significantly compared to conventional methods.

Main Methods:

  • Development of 18 pre-labeled oligonucleotide probes (PLOPs) targeting 45S and 5S rDNA, Arabidopsis-type telomeres, and Panax ginseng-specific tandem repeats.
  • Application of PLOPs in a streamlined FISH protocol.
  • Simultaneous visualization of multiple target loci using differentially labeled PLOPs.

Main Results:

  • Successful application of 16 rDNA PLOPs universally in plants and animals.
  • Demonstrated utility of telomere PLOPs in plants with Arabidopsis-type telomeres.
  • Developed a P. ginseng-specific PLOP for distinguishing species.
  • Reduced FISH hybridization time from approximately 16 hours to just 5 minutes.
  • Achieved simultaneous visualization of different target loci.

Conclusions:

  • PLOP-FISH is an efficient, reliable, and rapid method for genomic DNA element visualization.
  • This technique is ideal for routine analysis, particularly for newly sequenced genomes.
  • PLOP-FISH facilitates the analysis of universal targets (rDNA, telomeres) and specific targets (novel tandem repeats).