Multiplex Nucleic Acid Detection via Magnetic Bead Substitution
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Solution Overview
Problem
Current digital PCR methods have limited multiplex capability due to the optical resolution limitations of available fluorescent dyes, which restricts the simultaneous analysis of multiple nucleic acid sequences and hampers applications such as multiplex nucleic acid analysis and clinical diagnostics.
Innovation Solution
A method involving immobilized analyte molecules with identity sequence tags, hybridization of labeled probes, ligation, and sequential paired-probe ligation to determine identity codes, allowing for the analysis of multiple target nucleic acid sequences by generating and spatially separating clonal amplicons, and using a system with a flow cell for temperature control and magnetic separation for multiplex analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fluorescent dyes are used for detection in digital PCR, then detection capability is provided, but optical resolution limitations restrict multiplex capability
Solution Approach 1:
The patent replaces the optical detection system (fluorescent dyes with limited resolution) with a magnetic detection system. Magnetic beads with magnetic labels are used instead of fluorescent dyes, allowing detection through magnetic properties rather than optical properties. This substitution eliminates the optical resolution limitation and enables higher multiplex capability, as magnetic detection can distinguish multiple targets simultaneously without the same physical constraints as optical methods.
2Productivity
If multiple nucleic acid sequences are analyzed simultaneously, then productivity is improved, but detection accuracy may be compromised due to optical limitations
Solution Approach 1:
The patent replaces optical detection with magnetic detection to maintain both high productivity and high measurement precision. By using magnetic beads with different magnetic properties for different nucleic acid targets, the system can simultaneously analyze multiple sequences while accurately distinguishing each target through magnetic signal differentiation, avoiding the trade-off between multiplex capability and detection accuracy inherent in optical systems.
Solution Approach 2:
The patent changes the detection parameter from optical properties (fluorescence) to magnetic properties. This parameter change allows for improved multiplex capability because magnetic detection can resolve multiple signals simultaneously without the optical resolution constraints that limit fluorescent-based digital PCR. The magnetic labels on beads provide distinct magnetic signatures that enable accurate simultaneous detection of multiple nucleic acid sequences.
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 simultaneous analysis of multiple target nucleic acid sequences with improved multiplex capability, enhancing applications like non-invasive cancer detection and clinical diagnostics by accurately determining sequence status and quantifying nucleic acid sequences.
Implementation Method 1
a magnetic unit that applies a magnetic field through the heat conducting layer
Implementation Method 2
hybridizing a pair of labeled IS probes (LISPs) from a specified pool of LISP probes with the IS tags at base interrogation positions
Implementation Method 3
ligating the pair of juxtaposed LISPs with a DNA ligase
Data Source
AI summary
A method of quantifying multiple target nucleic acid sequences in a sample includes generating from a sample at least a plurality of first template molecules and at least a plurality of second template molecules. At least part of said first and at least part of said second template molecules are randomly distributed into individual reaction sites. A cluster of nucleic acid amplicons of said first template molecule and at least a cluster of nucleic acid amplicons of said second template molecule are generated by clonal amplification or replication. The ID codes of all said nucleic acid amplicon clusters are identified. The quantity of at least said first and second target nucleic acid sequences in said sample is quantified by statistical analysis of respective positive numbers of identified unique ID codes of first and second target nucleic acid sequences.