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Updated: Feb 8, 2026

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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TAMRA-polypyrrole for A/T sequence visualization on DNA molecules.

Seonghyun Lee1, Yusuke Kawamoto2, Thangavel Vaijayanthi2

  • 1Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Seoul 04107, Republic of Korea.

Nucleic Acids Research
|June 23, 2018
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Summary

Researchers developed TAMRA-polypyrrole, a novel reagent for visualizing DNA sequences by targeting adenine and thymine base pairs. This method enables accurate DNA sequencing and identification of genomic fragments without damaging the DNA molecule.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Sequence-specific DNA binding reagents are crucial for visualizing genetic information on large DNA molecules.
  • Existing methods using intercalating dyes can cause photocleavage and structural deformation of DNA.

Purpose of the Study:

  • To synthesize and evaluate a novel TAMRA-linked polypyrrole for visualizing adenine and thymine (A/T) base pairs in DNA.
  • To demonstrate the utility of this reagent for DNA sequencing and identification of genomic fragments.

Main Methods:

  • Synthesis of TAMRA-linked polypyrrole, a novel fluorophore-linked DNA binding reagent.
  • Staining of large DNA molecules and polytene chromosomes with TAMRA-polypyrrole.
  • Generation of fluorescent intensity profiles based on A/T frequency.
  • Computer-aided analysis comparing intensity profiles with genome sequences.
  • Identification of genomic DNA fragments from Escherichia coli.

Main Results:

  • TAMRA-polypyrrole successfully visualized A/T base pair distribution, generating characteristic sequence composition patterns.
  • Computer analysis of intensity profiles enabled DNA sequence determination from visualized DNA molecules.
  • The reagent demonstrated advantages for single DNA molecule detection, avoiding photocleavage and structural deformation.
  • Genomic DNA fragments from Escherichia coli were identified by aligning TAMRA-polypyrrole-generated A/T frequency maps.
  • Distinct band and interband patterns were observed in polytene chromosomal DNA due to preferential AT binding.

Conclusions:

  • TAMRA-polypyrrole is an effective reagent for sequence-specific DNA visualization and analysis.
  • This method offers a robust and non-destructive approach for DNA sequencing and fragment identification.
  • The reagent's ability to bind AT base pairs provides insights into DNA structure and composition.