Temporal Contrast Pixel Arrays for Real-Time Nucleic Acid Sequencing
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Solution Overview
Problem
Current DNA sequencing techniques are inefficient, costly, and error-prone due to their reliance on stepwise processes, expensive sensors, and time-consuming image analysis, limiting sequencing length and introducing high error rates.
Innovation Solution
An event-based imaging technique using Temporal Contrast Pixel Arrays (TCPAs) and Address Event Representation (AER) for real-time detection of nucleic acid sequencing, allowing independent detection of each nucleotide incorporation and reducing the need for cycling through chemistries and wash steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stepwise sequencing processes with predetermined cycles are used, then coordination for multiple targets is achieved, but sequencing speed is limited and time is consumed
Solution Approach 1:
The patent employs periodic action by implementing cyclic sequencing reactions where reagents are repeatedly added and removed in standardized cycles. Each cycle includes adding sequencing reagents, incubating, washing away unincorporated reagents, and imaging, which repeats multiple times to sequence the entire DNA strand. This periodic methodology enables systematic progression through the sequencing process while maintaining coordination across multiple targets.
Solution Approach 2:
The patent applies preliminary action through library preparation steps performed before actual sequencing, including DNA fragmentation, end repair, adapter ligation, and amplification. These preparatory actions ensure that DNA libraries are properly formatted and ready for sequencing, allowing the main sequencing process to proceed efficiently without interruptions for sample preparation during the actual sequencing runs.
2Reliability
If conventional sensors and image analysis methods are used, then detection of nucleic acids is achieved, but costs are high and error rates are high
Solution Approach 1:
The patent replaces complex mechanical imaging systems with a simpler optical detection approach. Instead of using expensive conventional sensors that require complex image analysis algorithms, the invention uses fluorescently labeled nucleotides that emit light upon incorporation, which can be detected by simpler optical detectors. This substitution reduces both device complexity and associated costs while maintaining or improving detection accuracy.
Solution Approach 2:
The patent employs color changes through fluorescent labeling of nucleotides with different fluorophores that emit distinct colors or wavelengths when excited. Each nucleotide type (A, C, G, T) is labeled with a unique fluorescent marker, allowing simultaneous detection of multiple nucleotide incorporations through their characteristic emission colors. This optical signaling method simplifies detection compared to conventional sensors while reducing error rates through precise spectral discrimination.
3Loss of substance
If conventional sequencing methods with multiple reagent introductions are used, then complete sequencing coverage is achieved, but reagent volumes are large and waste is generated
Solution Approach 1:
The patent applies merging by combining multiple sequencing cycles into a single continuous imaging process. Instead of performing separate imaging steps for each nucleotide type with intermediate washing steps, the system uses four different fluorescently labeled nucleotides that can all be present simultaneously in the reaction mixture. The imaging system detects which fluorophore is incorporated at each position, allowing all four nucleotide types to be sequenced in parallel within a single reaction well, thereby reducing reagent consumption and waste while maintaining complete sequencing 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 enhances sequencing speed and reduces costs by enabling real-time, cost-effective detection of nucleic acids with reduced data processing and error rates, using a one-pot chemistry design that minimizes reagent volume and waste.
Implementation Method 1
detect changes in the emissions of indicator molecules that are bound to target molecules of interest
Data Source
AI summary
Real-time sequencing of single nucleic acids, using event-based detection for uniformly high signal-to-noise ratios and streamlined data outputs. Methods and devices for using temporal contrast pixel arrays (TCPA) to detect indicator molecules bound to targets, such as nucleic acids, enabling real-time, asynchronous sequencing. Instruments, consumable kits and devices, and point-of-care devices for performing these methods and displaying the results on mobile devices.