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Related Experiment Videos

DNA staining for fluorescence and laser confocal microscopy

T Suzuki1, K Fujikura, T Higashiyama

  • 1Department of Cell Biology, Gunma University, Japan.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|January 1, 1997
PubMed
Summary

SYBR Green I and TO-PRO-3 are best for nuclear DNA staining, showing minimal cytoplasmic RNA co-staining. TOTO-3 and TO-PRO-3 offer superior far-red fluorescence for advanced microscopy applications.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Microscopy Techniques

Background:

  • Accurate nuclear DNA staining is crucial for various biological studies.
  • Several nucleic acid binding fluorescent dyes exist, but their specificity and performance vary.
  • Understanding dye characteristics is essential for optimal experimental design.

Purpose of the Study:

  • To evaluate five fluorescent dyes (propidium iodide, SYBR Green I, YO-PRO-1, TOTO-3, TO-PRO-3) for nuclear DNA staining.
  • To determine optimal dye concentrations, assess RNA co-staining, and compare bleaching speeds.
  • To identify the best dyes for specific microscopy techniques and labeling combinations.

Main Methods:

  • Utilized fluorescence and laser confocal microscopy to visualize DNA staining.

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  • Examined five nucleic acid binding fluorescent dyes: propidium iodide, SYBR Green I, YO-PRO-1, TOTO-3, and TO-PRO-3.
  • Performed RNAse treatment to differentiate DNA and RNA staining; assessed bleaching speeds and performance with fluorescence-labeled antibodies.

    • Main Results:

    • SYBR Green I and TO-PRO-3 demonstrated preferential nuclear DNA staining with minimal cytoplasmic RNA co-staining.
    • Propidium iodide, YO-PRO-1, and TOTO-3 showed co-staining of cytoplasmic RNA, which was eliminated by RNAse treatment.
    • TOTO-3 and TO-PRO-3 provided far-red fluorescence under red excitation and were optimal for Kr/Ar-laser illumination with fluorescein and rhodamine immunolabeling.

    Conclusions:

    • SYBR Green I and TO-PRO-3 are highly specific for nuclear DNA staining.
    • TOTO-3 and TO-PRO-3 are superior choices for nuclear DNA staining in advanced microscopy, especially when combined with other fluorophores.
    • These findings aid researchers in selecting appropriate fluorescent dyes for precise cellular imaging.