DNA-Barcode Antibody Isotype Detection for Sensitive Multiplex Assays
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Solution Overview
Problem
Current diagnostic methods for detecting specific antibody isotypes, particularly in the context of allergic responses, autoimmune diseases, and inflammation, are not sensitive, specific, and cost-effective, often requiring large sample volumes and suffering from interference by abundant proteins.
Innovation Solution
The use of antigen-DNA and antibody-binding agent-DNA conjugates with DNA barcodes allows for the detection of specific antibody isotypes through nucleic acid-based methods like PCR or microarray analysis, enabling multiplex detection and quantitation of disease-relevant antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional protein-based detection methods are used, then the detection can be performed with simple equipment, but the sensitivity is insufficient due to the low concentration of IgE compared to abundant interfering proteins
Solution Approach 1:
The patent replaces protein-based detection methods with nucleic acid-based detection. Specifically, it uses DNA-conjugated secondary antibodies and DNA-conjugated antigens with unique DNA barcodes that can be detected and quantified through PCR amplification. This substitution of detection mechanism eliminates the interference from abundant proteins because the detection target is now DNA rather than protein, allowing sensitive detection of low-concentration IgE antibodies.
Solution Approach 2:
The patent introduces DNA barcodes as an intermediary between the antibody-antigen interaction and the detection step. The DNA-conjugated secondary antibodies and DNA-conjugated antigens carry unique DNA sequences that serve as detectable intermediaries. These DNA intermediaries can be amplified and detected with high sensitivity through PCR, bypassing the limitations of direct protein detection and eliminating interference from other serum proteins.
2Measurement precision
If multiple antibody isotypes are detected using separate assays, then each isotype can be detected with high specificity, but the complexity and cost of the diagnostic workflow increases
Solution Approach 1:
The patent creates a universal detection platform that can simultaneously detect multiple antibody isotypes (IgE, IgM, IgG, IgA, IgD) in a single assay. Each isotype-specific antibody is detected using DNA-conjugated secondary antibodies with unique DNA barcodes. All these different antibody-isotype complexes share the same detection mechanism: PCR amplification of their respective DNA barcodes. This universal approach allows multiplex detection without requiring separate assays for each isotype, reducing overall complexity while maintaining isotype-specific accuracy.
Solution Approach 2:
The patent segments the detection signal into unique DNA barcodes for each antibody-isotype combination. Each DNA-conjugated secondary antibody carries a specific barcode sequence that corresponds to its target isotype. During PCR detection, these segmented barcode signals can be individually amplified and quantified, allowing simultaneous detection of multiple isotypes in a single reaction mixture. This segmentation of detection signals enables multiplexing while maintaining the ability to distinguish and quantify each isotype separately.
3Quantity of substance
If large volumes of serum are used for detection, then sufficient analyte is available for analysis, but the cost and sample consumption increase
Solution Approach 1:
The patent performs preliminary concentration of the DNA barcode signals through PCR amplification before detection. The DNA-conjugated secondary antibodies and DNA-conjugated antigens are present in the sample at low concentrations, but their DNA barcodes can be exponentially amplified through PCR. This preliminary amplification action allows detection of trace amounts of antibodies from small sample volumes, eliminating the need to use large serum volumes to obtain sufficient analyte for analysis.
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 provides sensitive, reliable, and cost-effective detection of antibodies, allowing for better disease management by identifying and quantifying isotypes such as IgE, IgM, IgG, IgA, and IgD, with applications in diagnosing conditions like HIV infection and monitoring allergic responses.
Implementation Method 1
the antigen binds to the target antibody isotype in the sample, if present, and the antibody-binding agent specifically binds to the target antibody isotype resulting in formation of a complex
Implementation Method 2
connecting the first DNA molecule to the second DNA molecule in the complex, wherein the first portion of the barcode and the second portion of the barcode are joined to form a complete barcode
Implementation Method 3
detecting the complete barcode as an indication of the presence of the target antibody isotype in the sample
Data Source
AI summary
Methods and reagents for multiplex detection of antibodies are disclosed. In particular, the invention relates to multiplex detection of antibodies using antigen-DNA and antibody-binding agent-DNA conjugates carrying DNA barcodes for identifying and quantitating disease-relevant antibody isotypes, such as those involved in allergic responses, autoimmune diseases, infections, and inflammation.