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Targeting duplex DNA with chimeric α,β-triplex-forming oligonucleotides.

N A Kolganova1, A K Shchyolkina, A V Chudinov

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, Moscow, 119991, Russia.

Nucleic Acids Research
|May 30, 2012
PubMed
Summary
This summary is machine-generated.

Synthetic biology tools enable chimeric triplex-forming oligonucleotides (TFOs) to recognize double-stranded DNA. These novel TFOs can identify base pair inversions, overcoming limitations of polypurine sequences.

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Area of Science:

  • Synthetic biology
  • Molecular biology
  • Biochemistry

Background:

  • Triplex-directed DNA recognition is typically restricted to polypurine sequences.
  • This limitation hinders the application of DNA triplexes in various biological contexts.
  • Synthetic biology offers tools to engineer novel DNA-binding molecules.

Purpose of the Study:

  • To design and characterize chimeric α,β-triplex-forming oligonucleotides (TFOs).
  • To investigate the DNA recognition capabilities of these chimeric TFOs.
  • To explore the potential of chimeric TFOs in targeting double-stranded DNA, including base pair inversions.

Main Methods:

  • Design of short chimeric α,β-TFOs.
  • Hybridization studies with fluorescently labeled duplex hairpins.
  • Native gel electrophoresis, on-array thermal denaturation, and fluorescence-quenching experiments.
  • Circular Dichroism (CD) spectroscopy.
  • EcoRI endonuclease protection assay.

Main Results:

  • Chimeric TFOs recognize double-stranded DNA through a combination of reversed Hoogsteen and non-canonical hydrogen bonding.
  • Chimeric TFOs form highly stable α,β-triplexes in the presence of magnesium ions.
  • CD spectra indicate anti-parallel purine triplex formation with GA or GT third strands.
  • Chimeric TFOs successfully demonstrated targeting of double-stranded DNA in an endonuclease protection assay.
  • First-time report of chimeric TFOs recognizing base pair inversions in a DNA duplex.

Conclusions:

  • Chimeric α,β-TFOs represent a significant advancement in synthetic biology for DNA recognition.
  • These novel oligonucleotides overcome previous sequence limitations, enabling broader applications.
  • The ability to recognize base pair inversions opens new avenues for targeted DNA manipulation and diagnostics.