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Related Experiment Video

Updated: Jul 1, 2026

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
09:04

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Published on: September 21, 2017

Sequence specific fluorescence detection of double strand DNA.

Victor C Rucker1, Shane Foister, Christian Melander

  • 1The Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Journal of the American Chemical Society
|January 30, 2003
PubMed
Summary

New hairpin polyamides with tetramethyl rhodamine (TMR) act as fluorescent sensors for specific DNA sequences. These sensors detect DNA without denaturation, enabling efficient screening of DNA-protein interactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Fluorescent detection of specific DNA sequences is crucial for human genetics.
  • Existing methods may require DNA denaturation.
  • Novel sensors are needed for homogeneous DNA detection.

Purpose of the Study:

  • To synthesize and characterize novel polyamide-fluorophore conjugates for DNA detection.
  • To evaluate the fluorescence response of these conjugates in the presence of specific DNA sequences.
  • To assess the specificity of different polyamide ring pairs for DNA minor groove recognition.

Main Methods:

  • Synthesis of hairpin polyamides functionalized with tetramethyl rhodamine (TMR).
  • Fluorescence spectroscopy to measure TMR emission in the presence and absence of duplex DNA.
  • Comparative analysis of fluorescence signals with matched and mismatched DNA sequences.
  • Systematic screening of polyamide ring pair specificities for all 16 possible DNA base pairs.

Main Results:

  • Polyamide-TMR conjugates exhibited significantly increased fluorescence upon binding to target DNA sequences.
  • The fluorescence enhancement was greater for matched DNA compared to mismatched DNA.
  • A ranking of specificity was established for Py/Py, Im/Py, and Im/Im polyamide ring pairs.
  • The Im/Im ring pair demonstrated favorable energetics for recognizing the T.G base pair in the DNA minor groove.

Conclusions:

  • Polyamide-fluorophore conjugates represent a new class of sensors for specific DNA sequence detection without denaturation.
  • This fluorescence-based method allows for parallel screening of DNA-minor groove interactions, including non-Watson-Crick base pairs.
  • The Im/Im polyamide ring pair shows high specificity for the T.G base pair, offering potential for targeted genetic analysis.