Encoded Bead Multiplex Assays for Genomic Gain Loss Detection
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Solution Overview
Problem
Current multiplex assays for detecting genomic DNA face challenges such as bead networking and performance issues, particularly when using BAC DNA as probe material, which limits their effectiveness in accurately detecting chromosomal gains and losses.
Innovation Solution
The method involves using encoded particle sets with amplicons that represent entire template DNA sequences, hybridized with both sample and reference DNA, allowing for the detection of specific hybridization signals and comparison to identify differences, thereby overcoming the limitations of existing assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BAC DNA is used as probe material in multiplex assays, then the ability to detect chromosomal gains and losses is improved, but bead networking and assay performance problems occur
Solution Approach 1:
The patent segments the BAC DNA probe material into multiple smaller amplicons (500-1200 nucleotides each) that are individually attached to different encoded particles. This segmentation prevents bead networking while maintaining the ability to detect entire chromosomal regions through collective hybridization of multiple amplicons, thus resolving the contradiction between detection accuracy and assay stability
Solution Approach 2:
The patent creates multiple copies of genomic regions by amplifying BAC DNA into numerous smaller amplicons that are distributed across different encoded particles. Each particle carries a copy of a specific genomic region, and collectively they represent the entire target sequence. This copying approach eliminates bead networking issues while preserving detection capability through redundant representation of target sequences
2Measurement precision
If multiple encoded particle sets are used to represent entire template DNA sequences, then the coverage and accuracy of genomic detection is improved, but the complexity of the assay increases
Solution Approach 1:
The patent uses a universal encoding scheme where all encoded particles, regardless of which specific genomic region they represent, share common structural features and can be processed through the same hybridization and detection workflow. The encoded particles are universally compatible with the assay system, allowing multiple particle sets to be handled as a unified system rather than separate complex procedures, thus managing complexity while maintaining detection accuracy
Solution Approach 2:
The patent creates equipotential conditions by ensuring all encoded particles have equivalent hybridization capabilities and detection properties. Each particle set is designed with comparable amplicon lengths (500-1200 nucleotides) and attachment densities, allowing uniform hybridization kinetics and signal detection across all particles. This equipotential design simplifies data analysis and interpretation while maintaining comprehensive genomic coverage
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 accurate detection of genomic DNA differences, including chromosomal gains and losses, without the issues of bead networking, providing a robust and effective method for genetic analysis.
Implementation Method 1
The amplicons of the first encoded particle set are hybridized with detectably labeled sample DNA and with detectably labeled reference DNA
Data Source
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AI summary
Encoded bead multiplex assays for chromosomal gains and losses are provided that provide the benefits of complex, large template DNA sources, such as BAC DNA, as the probe material without bead networking or other assay performance problems. Reagents for assaying DNA are described herein which include a plurality of encoded particles having attached amplicons amplified from a template DNA sequence. Each individual attached amplicon includes a nucleic acid sequence identical to a random portion of the template DNA sequence, wherein the amplicons together represent substantially the entire template DNA and wherein the nucleic acid sequence identical to a random portion of the template DNA sequence of each individual amplicon is shorter than the entire template DNA.