Convex lens-induced nanoscale templating.

Area of Science:

• Biophysics
• Nanotechnology
• Molecular Biology

Background:

• Conventional nanofluidic devices often require complex fabrication, such as direct bonding, and high pressures or electric fields for sample loading.
• Manipulating and trapping single DNA molecules in nanoscale environments is crucial for various biological analyses.

Purpose of the Study:

• To introduce a novel platform, convex lens-induced nanoscale templating (CLINT), for dynamic manipulation and trapping of single DNA molecules.
• To demonstrate CLINT's ability to create tunable nanofluidic devices from macroscale flow cells without permanent bonding.

Main Methods:

• CLINT utilizes the curvature of a convex lens to deform a coverslip over a substrate with nanotopography, creating an adjustable nanoscale gap.
• The platform facilitates DNA molecule confinement within embedded nanostructures like nanogrooves and nanopits.
• Sample loading is simplified as DNA is driven into the topography from above, avoiding high pressures or electric fields.

Main Results:

• CLINT successfully confined DNA to nanogrooves and nanopits, enabling DNA nanochannel-based stretching, denaturation mapping, and single-molecule trapping.
• High DNA stretching (90%) was achieved in sub-30-nm nanochannels using biologically relevant ionic strengths, consistent with theoretical predictions.
• Genomic features were mapped using denaturation analysis within the CLINT platform.

Conclusions:

• CLINT offers a versatile, accessible, and dynamic approach to nanofluidic device fabrication and single-molecule manipulation.
• The platform simplifies DNA loading and enables advanced analyses such as high-resolution stretching and genomic mapping.
• CLINT represents a significant advancement for single-molecule studies in biophysics and nanotechnology.