Aptamer Display on Diverse DNA Polyhedron Supports

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Molecular Biology

Background:

• DNA aptamers are crucial for molecular recognition in biomedicine.
• Nucleic acid nanostructures offer novel platforms for diagnostic tools.
• Plasmodium falciparum lactate dehydrogenase (PfLDH) is a key biomarker for malaria detection.

Purpose of the Study:

• To investigate DNA polyhedra shapes and sizes for optimal aptamer display.
• To enhance the sensitivity of an aptamer-based malaria detection assay.
• To compare aptamer display on nanostructures versus aptamer alone.

Main Methods:

• Synthesized various DNA polyhedra (tetrahedron, pyramids, prisms).
• Immobilized a PfLDH-binding aptamer onto these nanostructures.
• Evaluated assay sensitivity using the Aptamer-Tethered Enzyme Capture (APTEC) method.
• Compared performance based on nanostructure shape, size, and display height.

Main Results:

• Optimized DNA nanostructures improved aptamer assay sensitivity up to sixfold.
• Tetrahedron shapes with multiple basal contacts were superior to complex structures.
• Display height had minimal impact on assay efficacy.
• Nanostructure-supported aptamer display enhanced PfLDH detection.

Conclusions:

• Displaying aptamers on optimized DNA nanostructures significantly boosts malaria biomarker detection sensitivity.
• DNA nanostructure polyhedron supports are promising for developing sensitive aptamer-mediated diagnostic assays.
• This approach holds potential for improving malaria diagnosis and other applications.