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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
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Distinguishing single- and double-stranded nucleic acid molecules using solid-state nanopores.

Gary M Skinner1, Michiel van den Hout, Onno Broekmans

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

Nano Letters
|June 23, 2009
PubMed
Summary

Solid-state nanopores can distinguish between single- and double-stranded RNA and separate RNA homopolymers. This advancement enhances prospects for nanopore-based DNA and RNA mapping technologies.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Solid-state nanopores are emerging tools for analyzing biopolymer structures like DNA and RNA.
  • Current methods for nucleic acid analysis can be time-consuming or require extensive sample preparation.

Purpose of the Study:

  • To investigate the translocation of RNA molecules through solid-state nanopores.
  • To determine if nanopore blockade currents can differentiate between various RNA structures and compositions.
  • To assess the potential of nanopore technology for rapid nucleic acid identification and mapping.

Main Methods:

  • Translocation of double-stranded RNA and single-stranded homopolymers (poly(A), poly(U), poly(C)) through solid-state nanopores.
  • Measurement of differential blockade currents for translocating RNA molecules.
  • Application of high voltages (approx. 600 mV) to induce entropic stretching of RNA molecules.

Main Results:

  • Successfully translocated RNA molecules through solid-state nanopores.
  • Demonstrated discrimination between single- and double-stranded nucleic acid molecules based on blockade currents.
  • Achieved separation of purine-based homopolymers from pyrimidine-based homopolymers.
  • Observed sensitivity to subtle differences in polymer structure.

Conclusions:

  • Solid-state nanopore technology can rapidly differentiate between RNA structural forms (single- vs. double-stranded).
  • Nanopore analysis allows for the classification of RNA homopolymers based on base composition.
  • High-voltage-induced entropic stretching enhances molecule identification.
  • This technique significantly improves the potential for nanopore devices in DNA and RNA structural mapping.