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Related Experiment Videos

DNA triple-helix formation at physiologic pH and temperature.

J C Hanvey1, E M Williams, J M Besterman

  • 1Department of Cell Biology, Glaxo Research Institute, Research Triangle Park, North Carolina.

Antisense Research and Development
|January 1, 1991
PubMed
Summary

Triple helix formation using oligonucleotides can site-specifically regulate gene expression. This study demonstrates triplex formation occurs under physiological conditions (pH 7.5, 37°C), influenced by oligomer length, spermine, and salt concentrations.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Oligonucleotides forming triple helices with DNA offer a method for site-specific gene regulation.
  • Homopyrimidine triplexes typically require acidic pH and low temperatures, with limited data at physiological conditions.

Purpose of the Study:

  • To investigate triplex formation by homopyrimidine oligonucleotides at pH 7.5 and 37°C.
  • To determine the effects of oligomer length, spermine, and salt concentration on triplex stability and formation.

Main Methods:

  • Formation of triple helices using a 30-mer oligonucleotide (T and 5-methyl C) with a target DNA duplex.
  • Assessing triplex formation under varying conditions: temperature, oligomer length, spermine concentration, and KCl concentration.

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Main Results:

  • A 30-mer oligonucleotide formed a triplex with its target duplex at pH 7.5 and 37°C, with slow association (approx. 1 hour).
  • Triplex formation was dependent on oligomer length (25-mer and 30-mer effective at 37°C) and temperature.
  • Increased spermine concentration enhanced triplex formation, while high KCl concentrations inhibited it, an effect counteracted by higher spermine levels.

Conclusions:

  • Triple helix formation is feasible under physiological conditions (pH 7.5, 37°C).
  • Oligonucleotide length, spermine, and ionic strength are critical factors influencing triplex formation.
  • Competing interactions affect the efficiency of triple helix formation in vivo.