Microarray Bead Encoding via Particle Number Ratios
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Solution Overview
Problem
Current bead microarray technologies face challenges in accurately encoding and decoding individual beads to determine the identity of the biomolecules they carry, relying on physical tags which are complex, costly, and can interfere with analyte binding and readout, with existing libraries limited to around 500 tags and requiring cumbersome tag creation processes.
Innovation Solution
A method involving the deposition of particles on a microarray with unique particle number ratios and binding sites for specific target analytes, allowing for the determination of target analytes by analyzing changes in detectable signals without the need for physical tags, using a combination of particle subsets with known ratios and binding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical tags are used to encode individual beads in bead microarrays, then bead identification is enabled, but the system complexity increases, manufacturing cost increases, and tag interference with analyte binding occurs
Solution Approach 1:
The invention extracts and eliminates the physical tag component from the bead encoding system. Instead of using fluorescent tags or other physical identifiers attached to beads, the system uses the beads' inherent properties (size, shape, material composition) combined with spatial positioning information to achieve identification. This removes the harmful tags while preserving the identification function.
Solution Approach 2:
The invention creates a digital copy or representation of bead identity through imaging and data processing. Rather than physically tagging beads, the system captures images of beads, extracts features from these images, and creates a digital encoding scheme that maps bead positions and characteristics to specific analyte identities. This virtual encoding eliminates physical tags while maintaining identification capability.
2Measurement precision
If physical tags are used for bead encoding, then bead identity can be determined, but manufacturing cost increases and tag creation becomes cumbersome
Solution Approach 1:
The invention removes the tag creation process entirely from the manufacturing workflow. By using untaged beads with inherent distinguishing features and spatial encoding, the system eliminates the cumbersome steps of tag synthesis, attachment, and quality control, dramatically simplifying manufacturing while maintaining bead identity determination capability.
Solution Approach 2:
The invention uses simple, inexpensive bead materials without expensive fluorescent tags or complex identifiers. The encoding is achieved through low-cost spatial arrangement and basic imaging, making the system economically viable and suitable for high-throughput applications where cost efficiency is critical.
3Measurement precision
If physical tags are used for encoding, then bead identification is possible, but tag interference with analyte binding and readout occurs
Solution Approach 1:
The invention extracts and removes the interfering tag components from the bead structure. By using beads without attached fluorescent tags, antibodies, or other interfering molecules, the system eliminates sources of non-specific binding, background noise, and interference with analyte detection while preserving the ability to identify beads through their physical characteristics and spatial positions.
4Ease of manufacture
If traditional spotting technology is used to deposit biomolecules, then microarrays can be fabricated, but precision is poor and reproducibility is low
Solution Approach 1:
The invention replaces the mechanical spotting process with a bead-based system where pre-formed microbeads containing biomolecules are deposited onto the array. This substitution of the deposition mechanism eliminates the precision and reproducibility issues inherent in mechanical spotting while maintaining ease of manufacturing through standardized bead production and simplified deposition protocols.
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
Enables accurate and efficient identification of target analytes without physical tags, reducing manufacturing complexity and cost, while maintaining high multiplexing capabilities and avoiding tag-related interference, allowing for the detection of multiple analytes with a single deposition step.
Implementation Method 1
The first particle subset has at least one binding site configured to bind with a first one of the target analytes and the second particle subset has at least one binding site configured to bind with a second, different one of the target analytes
Data Source
AI summary
A method for determining a presence or absence of one or more target analytes in a sample includes contacting the sample with an array of particles comprising at least first and second particle subsets disposed therein with a known particle number ratio with respect to each other. The first particle subset has at least one binding site configured to bind with a first target analyte and the second particle subset has at least one binding site configured to bind with a second, different target analyte. Changes are detected in a detectable signal emitted by the particles after contacting the sample with the array. A number of the particles that emit the change in the detectable signal are counted and this number is compared to the known particle number ratio of the subsets so as to determine the presence or absence of the one or more of the target analytes.