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Detection of structured single-strand DNA via solid-state nanopore.

Shao-Chuang Liu1, Qiao Li1, Yi-Lun Ying1

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Solid-state nanopores enable detailed single-molecule analysis of C-rich quadruplex DNA. Choosing the right nanopore size is crucial for observing structural dynamics and DNA translocation behaviors.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Nanopore technology, combined with electrophoresis, offers sensitive single-molecule detection capabilities.
  • C-rich sequences can form G-quadruplex structures, which are important in biological processes but challenging to study at the single-molecule level.

Purpose of the Study:

  • To investigate the structural dynamics of single-stranded C-rich quadruplex DNA using solid-state nanopores.
  • To explore how nanopore dimensions influence the translocation and structural behavior of quadruplex DNA.

Main Methods:

  • Fabrication of solid-state nanopores with precisely controlled diameters.
  • Single-molecule analysis of C-rich quadruplex DNA translocation through nanopores of varying sizes.
  • Utilizing electrophoresis to drive and detect molecule movement.

Main Results:

  • DNA molecules translocated rapidly through nanopores larger than the quadruplex structure.
  • In smaller nanopores, DNA molecules either returned to solution or unzipped their quadruplex structure before passing through.
  • Demonstrated the critical role of nanopore size in resolving DNA structural features.

Conclusions:

  • Solid-state nanopores are effective tools for studying the structural dynamics of quadruplex DNA.
  • The choice of nanopore sensing interface is vital for obtaining detailed single-molecule information.
  • This approach holds significant potential for advancing the understanding of DNA structure-function relationships.