DNA Taggant Authentication Assay Using Toehold Strand Displacement
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Solution Overview
Problem
Existing anti-counterfeiting technologies for high-value products are vulnerable to loss, damage, and easy duplication, especially for small, flexible, or numerous items, and require laboratory equipment for verification, limiting their applicability.
Innovation Solution
An authentication assay using embedded DNA taggants that utilize toehold-mediated strand-displacement reactions, enabling rapid verification with a simple equipment, producing a unique fluorescent pattern through fluorophore-labeled DNA taggants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing anti-counterfeiting technologies are used, then product authenticity can be indicated, but the technologies are vulnerable to loss, damage, and easy duplication
Solution Approach 1:
The patent changes the physical and chemical parameters of the authentication system by using DNA molecules with specific sequences that can undergo strand displacement reactions. The DNA taggants contain unique sequences that complementarily bind to reporter oligonucleotides, creating a chemically stable authentication mechanism that is resistant to environmental factors and difficult to replicate without knowing the specific DNA sequences.
2Reliability
If existing authentication methods are used, then product authenticity can be verified, but laboratory equipment is required, limiting applicability
Solution Approach 1:
The patent replaces complex mechanical laboratory equipment with a simple optical detection system. The DNA strand displacement reaction produces a fluorescent signal that can be detected by basic optical instruments or even visual inspection, eliminating the need for sophisticated laboratory machinery while maintaining authentication reliability.
Solution Approach 2:
The authentication system is designed to be self-contained, with the DNA taggants embedded in the product and the verification process occurring through spontaneous chemical reactions. The system performs its own authentication function without requiring external laboratory infrastructure, making it accessible in field conditions.
3Ease of operation
If DNA taggants are used for authentication, then verification can be performed with simple equipment, but the system requires specific chemical reactions and conditions
Solution Approach 1:
The patent performs preliminary actions by pre-synthesizing the DNA taggants with specific sequences and embedding them in the product during manufacturing. The reporter oligonucleotides are also pre-prepared and attached to the substrate. This preliminary preparation ensures that when verification is needed, only a simple mixing and incubation step is required, eliminating the need for complex chemical preparation at the point of use.
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
Provides a reliable, inexpensive, and efficient method to authenticate products quickly and easily, resistant to mimicry, without the need for large equipment or laboratory space, and allows encoding additional product information.
Implementation Method 1
The at least one DNA taggant may include a fluorophore molecule configured to emit light upon excitation. Excitation of the fluorophore molecule attached to the DNA taggant may produce a pattern of emitted light at one or more assay locations.
Implementation Method 2
The system is driven by toehold-mediated strand-displacement reactions where matching oligonucleotide sequences drive the generation of a fluorescent signal through the potential energy of base pairing.
Data Source
Figure 1A~1C
Figure 2
Figure 3~5
AI summary
An authentication assay using embedded deoxyribonucleic acid (DNA) taggants includes a substrate and a sample of an authenticity label collected from a product. The substrate has a plurality of assay locations, each of which includes a reporter oligonucleotide bound to the substrate. The reporter oligonucleotide includes a first region with a single-stranded toehold sequence, a second region with a universal sequence, and a third region with a unique sequence, the second and third regions being prehybridized with a complementary strand. The sample includes at least one fluorophore-labeled DNA taggant complementary to the first and second regions of the reporter oligonucleotide. Incubation of the substrate with the sample results in a toehold-mediated DNA strand displacement reaction that exchanges the complementary strand for the fluorophore-labeled DNA taggant. Excitation of the fluorophore molecule attached to the DNA taggant produces a pattern of light emitted at one or more assay locations.