Nucleic Acid Amphiphile Nanostructures for Drug Delivery
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Solution Overview
Problem
There is a need for 3-dimensional structures with nano-scale features, such as nanotubes and twisted nanotapes, based on nucleic acid amphiphiles that can be used for therapeutic agent delivery, targeting biological molecules, or as templates for material design, which existing methods have not been able to achieve with similar complexity and functionality.
Innovation Solution
The development of nucleic acid amphiphiles comprising a hydrophilic polynucleotide headgroup covalently bonded to a hydrophobic tail, with a spacer or linker, that self-assemble into nanostructures like nanotubes and twisted nanotapes without requiring stringent annealing conditions or base pairing predictions, allowing for the formation of complex shapes like helical nanotubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional base pairing methods are used to create DNA nanostructures, then predictable assembly and structural uniformity are achieved, but the process requires stringent annealing conditions and complex base pairing prediction software
Solution Approach 1:
The patent introduces a hydrophobic tail as an intermediary element that mediates the assembly process. Instead of relying on complex base pairing interactions between multiple DNA strands, the hydrophobic tail provides a simple, universal driving force for assembly. The amphiphilic structure (hydrophobic tail + hydrophilic DNA headgroup) acts as a mediator that translates simple hydrophobic interactions into organized nanostructure formation, eliminating the need for complex prediction software and stringent annealing conditions while maintaining assembly reliability
2Ease of manufacture
If amphiphilic molecules are used to form DNA nanostructures, then spontaneous assembly without stringent annealing conditions is achieved, but structures with complex 3-dimensional shapes like nanotubes and twisted nanotapes have not been realized
Solution Approach 1:
The patent applies local quality by designing DNA headgroups with specific local sequences that can form particular secondary structures (hairpins, bulges, G-quadruplexes) at defined positions. These localized structural features, when combined with the amphiphilic assembly, drive the formation of complex global shapes like nanotubes and twisted nanotapes. The local sequence design acts as a template that directs the overall 3-dimensional morphology while maintaining the simplicity of spontaneous amphiphilic assembly
Solution Approach 2:
The patent creates composite amphiphilic molecules combining hydrophobic tails with functional DNA headgroups that can form specific secondary structures. This composite design allows the molecule to exhibit both the spontaneous assembly properties of amphiphiles and the structural complexity of base-pairing DNA structures. The hybrid nature of these composite molecules enables the formation of diverse 3-dimensional shapes including nanotubes, twisted nanotapes, and other complex morphologies that were previously unattainable with simple amphiphilic assembly
3Ease of operation
If ssDNA sequences are covalently linked with hydrophobic tails to form amphiphiles, then base pairing is not required for nanostructure formation and ssDNA remains available for functionalization, but the ability to create highly complex structures like DNA origami and tile assemblies is limited
Solution Approach 1:
The patent segments the DNA headgroup into functional modules: a core region that forms the amphiphilic assembly and terminal regions that contain ssDNA overhangs or hairpin structures. This segmentation allows the core to drive spontaneous amphiphilic assembly while the terminal segments retain base pairing capability for functionalization. The modular design enables complex structures to be built by combining simpler amphiphilic units with specific functional endgroups, achieving structural complexity without sacrificing functional availability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the rapid formation of complex nanostructures like nanotubes and twisted nanotapes, which can be used for targeted drug delivery and material design, demonstrating versatility in DNA nanostructure assembly beyond traditional base pairing methods.
Implementation Method 1
The amphiphilic nature of the conjugate induces spontaneous assembly of the molecules when added to an aqueous environment, with the hydrophobic tails preferring to sequester themselves into a hydrophobic domain
Implementation Method 2
nucleic acid amphiphiles comprising a hydrophilic polynucleotide headgroup covalently bonded to a hydrophobic tail, with a spacer or linker, that self-assemble into nanostructures like nanotubes and twisted nanotapes
Data Source
AI summary
Provided herein are nucleic acid amphiphiles and nanostructures such as nanotubes twisted nanotapes and helical nanotapes that comprise the amphiphiles as well as methods to deliver therapeutic agents with the nanostructures.