Reverse DNA translocation through a solid-state nanopore by magnetic tweezers

Area of Science:

• Nanotechnology
• Molecular Biology
• Biotechnology

Background:

• Voltage-driven DNA translocation through nanopores is crucial for molecular biology and biotechnology.
• Standard methods using electric fields offer poor control over DNA motion due to fast translocation speeds.

Purpose of the Study:

• To introduce and demonstrate a novel 'reverse DNA translocation' technique for controlled DNA movement through nanopores.
• To overcome the limitations of speed and control in conventional voltage-driven DNA translocation.

Main Methods:

• Utilized magnetic tweezers to create a magnetic-field gradient for mechanical pulling of DNA.
• Employed a magnetic bead attached to DNA for controlled translocation through a solid-state nanopore.
• Integrated simultaneous ionic current measurements with the translocation process.

Main Results:

• Successfully demonstrated reverse DNA translocation of DNA through a solid-state nanopore.
• Achieved mechanical control over DNA motion, overcoming the fast, uncontrollable nature of voltage-driven methods.
• Confirmed compatibility with ionic current measurements and potential for multi-nanopore applications.

Conclusions:

• Reverse DNA translocation offers a mechanically controlled alternative to voltage-driven DNA nanopore experiments.
• This technique enhances precision and control, opening avenues for large-scale applications in DNA analysis and manipulation.
• The method is suitable for integration with existing nanopore sensing platforms.