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Single Molecule DNA Resensing Using a Two-Pore Device.

Yuning Zhang1, Xu Liu2, Yanan Zhao2

  • 1Department of Physics, McGill University, Montreal, QC, H3A 2T8, Canada.

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|October 19, 2018
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Summary
This summary is machine-generated.

This study introduces a novel nanofluidic device for sensing single DNA molecules. The device enables precise measurement of molecular movement and recapture using two nanopores, advancing DNA analysis.

Keywords:
DNAnanoporesolid state nanoporetwo-pore

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Area of Science:

  • Nanotechnology
  • Molecular Biology
  • Biophysics

Background:

  • Single-molecule detection is crucial for understanding biological processes.
  • Existing methods face challenges in precise control and repeated analysis of molecules.
  • Nanopore technology offers a promising platform for molecular sensing.

Purpose of the Study:

  • To develop a nanofluidic device for independent sensing and resensing of single DNA molecules.
  • To enable controlled assessment of molecular time of flight and selective molecule recapture.
  • To acquire correlated translocation signatures for enhanced molecular analysis.

Main Methods:

  • Integration of a nitride membrane with microchannels in borosilicate glass.
  • Fabrication of two nanopores with sub-micrometer spacing.
  • Independent control of voltage and ionic current measurement at each nanopore.

Main Results:

  • Demonstrated independent sensing and resensing of single DNA molecules.
  • Achieved controlled molecular time-of-flight assessment and voltage-tuned molecule recapture.
  • Reported the rare simultaneous capture of a single DNA chain threading through both nanopores.
  • Acquired two correlated translocation signatures for each analyzed molecule.

Conclusions:

  • The developed nanofluidic device allows for unprecedented control and detailed analysis of single DNA molecules.
  • This technology opens new avenues for high-resolution molecular studies and diagnostics.
  • The ability to recapture and re-sense molecules enhances data reliability and analytical depth.