How capture affects polymer translocation in a solitary nanopore

Area of Science:

• Nanotechnology
• Biophysics
• Computational Biology

Background:

• High-fidelity DNA capture is crucial for nanopore translocation.
• Understanding DNA-polymer dynamics within nanopores is essential for sequencing applications.

Purpose of the Study:

• To investigate DNA capture and translocation through solid-state nanopores using Brownian dynamics simulations.
• To analyze the influence of electric fields and DNA properties on translocation efficiency.
• To explore methods for enhancing DNA translocation for genomic applications.

Main Methods:

• Brownian dynamics simulations of a model DNA polymer translocating through a solid-state nanopore.
• Analysis of DNA conformations and capture statistics at different stages.
• Investigation of electric field gradients and DNA flexibility effects.

Main Results:

• Capture time distribution follows a Poisson process and depends on the initial DNA position.
• Electric field gradients promote translocation, even after failed attempts.
• DNA flexibility influences hairpin-loop capture versus single-file translocation.
• A charged tag at the 5' end enhances multi-scan rates and unidirectional translocation.

Conclusions:

• Simulation results provide insights into experimentally observed DNA folding during nanopore translocation.
• The study differentiates translocation dynamics based on DNA folding.
• A charged tag offers a promising strategy to improve DNA translocation for genomic barcoding and sequencing.