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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
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Selective detection and quantification of modified DNA with solid-state nanopores.

Autumn T Carlsen1, Osama K Zahid, Jan A Ruzicka

  • 1Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest University School of Medicine , Winston Salem, North Carolina 27101, United States.

Nano Letters
|May 14, 2014
PubMed
Summary

This study introduces a novel solid-state nanopore assay for precise detection and measurement of modified DNA. The method uses streptavidin-tagged DNA, enabling accurate quantification of modified oligonucleotides within complex mixtures.

Keywords:
DNADNA modificationsSolid-state nanoporesproteinsquantificationsingle-molecule

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Nanotechnology

Background:

  • Accurate detection of modified DNA is crucial for various biological and medical applications.
  • Existing methods for DNA modification analysis can be complex and lack specificity.
  • Nanopore technology offers a promising platform for single-molecule analysis.

Purpose of the Study:

  • To develop a robust solid-state nanopore assay for discriminating and quantifying modified DNA.
  • To utilize high-affinity protein tags for specific DNA complex formation.
  • To establish a correlation between translocation events and DNA concentration.

Main Methods:

  • Employing solid-state nanopores for single-molecule analysis.
  • Utilizing streptavidin as a high-affinity tag for biotinylated DNA.
  • Measuring the rate of protein-DNA complex translocation through nanopores.
  • Quantifying modified oligonucleotides against a background of unmodified DNA.

Main Results:

  • Demonstrated unambiguous discrimination between modified and unmodified DNA.
  • Established a direct correlation between translocation event rates and protein-DNA complex concentration.
  • Successfully quantified modified oligonucleotides in solution with high selectivity.

Conclusions:

  • The developed nanopore assay provides a sensitive and selective method for modified DNA analysis.
  • This technique enables accurate quantification of specific DNA modifications.
  • The assay has potential applications in diagnostics and molecular biology research.