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Related Experiment Videos

DNA fiber-FISH staining mechanism.

F M van de Rijke1, R J Florijn, H J Tanke

  • 1Departments of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|May 23, 2000
PubMed
Summary

Discontinuous signals in Fiber-FISH, a DNA mapping technique, result from DNA loss and renaturation. FISH sensitivity depends on hybridization efficiency, not probe signal amplification.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cytogenetics

Background:

  • Fluorescence in situ hybridization to DNA fibers (Fiber-FISH) is a high-resolution physical DNA mapping technique.
  • Fiber-FISH is increasingly used for studying pathological gene rearrangements.

Purpose of the Study:

  • To investigate the causes of discontinuous signal patterns observed in Fiber-FISH.
  • To understand the factors influencing FISH probe signal distribution and sensitivity.

Main Methods:

  • Utilized a novel cisplatin-based chemical labeling method to create intact biotin-labeled cosmid target DNA molecules.
  • Monitored cosmid target DNA fate during denaturation and hybridization using immunofluorescence.
  • Analyzed FISH probe signal distribution using digoxigenin-labeled cosmid DNA in a different color.

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Main Results:

  • Probe signals were found to be a subset of the remaining target signals after denaturation and hybridization.
  • Discontinuity in Fiber-FISH signals is primarily attributed to target DNA loss and limited accessibility from in situ renaturation and attachment.
  • FISH sensitivity is dictated by hybridization efficiency rather than the capacity to generate signal from small probes.

Conclusions:

  • The study elucidates the mechanisms behind discontinuous signals in Fiber-FISH.
  • Identifies DNA loss and renaturation as key factors affecting signal integrity.
  • Establishes hybridization efficiency as the critical determinant of FISH sensitivity.