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Related Experiment Videos

Four base recognition by triplex-forming oligonucleotides at physiological pH.

David A Rusling1, Vicki E C Powers, Rohan T Ranasinghe

  • 1School of Biological Sciences, University of Southampton Bassett Crescent East, Southampton SO16 7PX, UK.

Nucleic Acids Research
|May 25, 2005
PubMed
Summary
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Researchers developed synthetic nucleotides for triple helix formation, enabling recognition of all four DNA base pairs at physiological pH. This breakthrough advances DNA recognition and triplex stability studies.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Chemistry

Background:

  • DNA base pair recognition is fundamental to molecular biology.
  • Triple helix formation offers a specific mechanism for DNA targeting.
  • Developing synthetic nucleotides enhances the capabilities of DNA-based technologies.

Purpose of the Study:

  • To create synthetic nucleotides capable of forming triple helices at physiological pH.
  • To achieve recognition of all four standard DNA base pairs (A, T, G, C) within a triplex structure.
  • To evaluate the stability and selectivity of these novel triplexes.

Main Methods:

  • Design and synthesis of four distinct triplex-forming oligonucleotides (TFOs) with unique synthetic nucleotides.
  • Utilizing fluorescence melting and DNase I footprinting assays to confirm triplex formation.

Related Experiment Videos

  • Testing TFOs on a 19-mer oligopurine sequence with interruptions.

    • Main Results:

    • Successful formation of DNA triple helices at physiological pH (7.0) using TFOs with synthetic nucleotides.
    • Specific synthetic nucleotides demonstrated high affinity and selectivity for AT, GC, CG, and TA base pairs.
    • Complexes remained stable at pH 7.0, with some nucleotides showing tolerance to single base pair changes.

    Conclusions:

    • Synthetic nucleotides can enable robust triple helix formation at physiological pH.
    • These novel nucleotides expand the potential for sequence-specific DNA targeting and manipulation.
    • The developed system offers improved stability and selectivity for DNA recognition applications.