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Oligomeric fluorescent labels for DNA.

Andrea Cuppoletti1, Younjin Cho, Jin-Seong Park

  • 1Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.

Bioconjugate Chemistry
|May 19, 2005
PubMed
Summary

Researchers explored novel DNA fluorescent labels with multiple fluorophores. Some oligomeric labels, like pyrene, showed enhanced brightness and large Stokes shifts, outperforming commercial fluorescein labels.

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Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Materials Science

Background:

  • Developing fluorescent labels with large Stokes shifts and high emission intensity is crucial for advanced biological imaging and diagnostics.
  • Traditional fluorescent probes, such as fluorescein, often suffer from self-quenching and limited spectral properties when multiply substituted.

Purpose of the Study:

  • To investigate a novel strategy for creating DNA fluorescent labels by incorporating multiple fluorophores at adjacent positions on a DNA probe.
  • To evaluate the photophysical properties of oligomeric labels based on terphenyl, pyrene, and terthiophene, comparing them to commercial fluorescein.

Main Methods:

  • Synthesized C-glycoside DNA probes with hydrocarbon and heterocycle fluorophores (terphenyl, pyrene, terthiophene) replacing the DNA base at C-1 of deoxyribose.

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  • Incorporated up to five fluorophore units into oligomeric labels.
  • Examined the absorption and emission spectra, quantum yield, and Stokes shifts of the synthesized probes and a commercial fluorescein-dU nucleotide.

    • Main Results:

    • Fluorescein exhibited significant self-quenching and a small, constant Stokes shift with increasing substitution.
    • Pyrene-based oligomers showed increased quantum yield and efficient long-wavelength emission with Stokes shifts exceeding 130 nm.
    • Terphenyl oligomers displayed red-shifted absorption and emission, with brightness increasing with monomer count.
    • Terthiophene oligomers presented a combination of self-quenching and increasing Stokes shifts.

    Conclusions:

    • Oligomeric fluorescent labels, particularly those based on pyrene and terphenyl, offer superior photophysical properties compared to conventional fluorescein labels.
    • The strategy of incorporating multiple fluorophores at adjacent positions enables the development of novel DNA probes with tunable large Stokes shifts and enhanced brightness.
    • These findings open avenues for designing advanced fluorescent probes for sensitive and specific molecular detection in biological systems.