Actuatable Micropost Arrays for High-Plex Isothermal Amplification
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Solution Overview
Problem
Current nucleic acid amplification technologies face challenges in achieving fast, highly multiplexed, cost-effective, and point-of-care compatible diagnostics for infectious diseases, particularly in differentiating quarantine-requiring and non-quarantine-requiring infections, with existing methods suffering from primer interference, space requirements, and efficiency drops in solid-phase PCR.
Innovation Solution
A microfluidic device with a reaction chamber featuring actuatable microposts and capture probe arrays, integrated with isothermal amplification reagents, enhances fluid mixing and hybridization through magnetic, thermal, or sonic actuation, allowing for high-plex nucleic acid amplification in a compact format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spatial encoding using multi-pot design is used to achieve robust high-plex INAA, then primer interference is reduced, but the physical space required increases significantly and sample volume per reaction well decreases
Solution Approach 1:
The patent transitions from spatial multiplexing across multiple separate reaction chambers (2D/3D space) to temporal multiplexing within a single chamber using sequential primer activation (time dimension). This allows high-plex detection without proportionally increasing physical device area, as all multiplexed targets are processed in one confined reaction space through time-separated amplification cycles.
Solution Approach 2:
The system dynamically activates different primer sets at different time points during the isothermal amplification process. By controlling primer addition sequences and timing, the system enables multiple targets to be amplified sequentially in the same reaction chamber, transforming a static single-target assay into a dynamic multi-target assay without requiring multiple static reaction spaces.
2Reliability
If spatial encoding using multi-pot design is used to achieve robust high-plex INAA, then primer interference is reduced, but the detection limit deteriorates due to divided sample volumes
Solution Approach 1:
The patent merges all multiplexed target amplifications into a single reaction chamber rather than dividing the sample across multiple chambers. This consolidation ensures that the entire sample volume is available for each amplification target, maintaining high analytical sensitivity and detection limits even when detecting multiple pathogens simultaneously, unlike multi-pot designs where sample is partitioned.
Solution Approach 2:
The system employs periodic activation of different primer sets at specific time intervals during the amplification process. This temporal sequencing allows each target to receive adequate amplification resources from the full sample volume while preventing primer interference through time-separated activation, thereby maintaining both detection sensitivity and amplification robustness.
3Device complexity
If solid-phase PCR with immobilized primers is used, then one-pot reaction is achieved, but amplification efficiency drops significantly compared to solution-phase
Solution Approach 1:
The patent implements periodic addition of primers at specific time points during the isothermal amplification process rather than having them all present from the start. This temporal control allows primers to be activated when conditions are optimal, preventing premature binding or interference while maintaining high amplification efficiency, thus achieving both simple one-pot setup and high productivity.
Solution Approach 2:
The system changes the temporal parameters of primer availability by introducing primers at different time points during amplification. This dynamic parameter control optimizes the concentration and timing of primer-substrate interactions, maintaining high amplification efficiency comparable to solution-phase methods while retaining the simplified solid-phase one-pot format.
4Adaptability or versatility
If primer optimization is performed to achieve two-to-three target multiplexing in one-pot INAA, then modest multiplexing is possible, but significant optimization effort and cost are required
Solution Approach 1:
The patent uses sequential primer activation where different primer sets are introduced at different time points during the amplification process. This temporal separation inherently prevents primer-cross reactivity and interference, eliminating the need for extensive primer sequence optimization and concentration balancing that would otherwise be required for multiplexed assays, thereby reducing assay complexity while enabling high multiplexing.
Solution Approach 2:
The system performs preliminary temporal separation of primer activation, establishing a time-based hierarchy for primer introduction. By pre-planning the sequence and timing of primer addition before the assay runs, the system eliminates the need for complex iterative optimization of primer combinations, as the temporal structure itself prevents interference from the outset.
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
The system enables rapid, sensitive, and highly multiplexed nucleic acid amplification, supporting simultaneous detection of multiple pathogens with improved efficiency and reduced space requirements, suitable for point-of-care applications.
Implementation Method 1
utilizing magnetic, thermal, or sonic forces for actuation
Implementation Method 2
utilizing magnetic, thermal, or sonic forces for actuation
Implementation Method 3
utilizing magnetic, thermal, or sonic forces for actuation
Implementation Method 4
incorporating a capture probe array and isothermal amplification reagents
Data Source
AI summary
The invention provides a system and methods of multiplexed, solid-phase isothermal nucleic acid amplification. In various aspects, the invention uses a microfluidic device that includes a field of actuatable microposts in a reaction (or assay) chamber to enhance fluid flow, mixing, and hybridization/capture efficiency in a solid-phase capture assay. In various other aspects, the invention uses oligonucleotide primers immobilized in a field of actuatable microposts in a reaction chamber of a microfluidics device for capture and amplification of target-specific nucleic acids in a sample fluid. The invention provides methods of producing a micropost field (array) on a substrate for printing of a capture array (e.g., an array of primer spots). The invention also provides methods of printing an array of capture spots (e.g., primer spots) on the substrate surface of a micropost field.