Nanopore Sequencing via Electrical Signal Detection
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Solution Overview
Problem
Current DNA sequencing technologies face limitations in speed, accuracy, and cost due to reliance on optical detection methods, which are inadequate for rapid and efficient determination of nucleic acid sequences, especially for de novo assembly of human genomes, and struggle with short read lengths and sensitivity.
Innovation Solution
The use of electrical signal detection in nanopores or fluidic channels with multiple sensing electrodes to determine the length and sequence of biomolecules by monitoring changes in electrical properties as they traverse the channel, allowing for accurate sequencing without relying on time and position correlations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical detection methods are used for DNA sequencing, then sequence information can be obtained, but sequencing speed is slow and read lengths are short
Solution Approach 1:
The patent replaces optical detection methods with electrical detection using nanopores and sensing electrodes. Instead of using light to detect nucleic acid sequences, the invention uses electrical signals generated when biomolecules traverse through nanopores or fluidic channels, enabling faster sequencing while maintaining or improving accuracy through direct electrical measurement of molecular properties
Solution Approach 2:
The invention changes the detection parameter from optical properties to electrical properties. By measuring electrical conductivity, capacitance, or other electrical parameters as biomolecules pass through sensing regions, the system achieves both high-speed operation and accurate sequence determination, overcoming the speed-precision tradeoff inherent in optical methods
2Productivity
If optical detection is used, then sequencing can be performed, but cost is high and efficiency is low
Solution Approach 1:
The patent substitutes complex optical detection systems with simpler electrical detection using nanopores and electrodes. This replacement reduces device complexity while dramatically improving productivity, as electrical measurements can be performed rapidly and in parallel across multiple channels without the cumbersome optical infrastructure required by traditional sequencing methods
3Measurement precision
If time and position correlations are used for sequencing, then sequence information can be derived, but accuracy is limited by timing precision
Solution Approach 1:
The invention replaces time-based positional encoding with direct electrical property measurement. Instead of inferring sequence from timing correlations that are limited by measurement precision, the system directly measures electrical properties (conductivity, capacitance) that inherently encode molecular identity, eliminating time correlation dependency and achieving superior accuracy
Solution Approach 2:
The patent introduces electrical fields and sensing electrodes as intermediaries between the biomolecule and detection system. These intermediaries enable direct measurement of molecular properties through electrical interactions, providing more precise and reliable sequence information compared to indirect time-based optical detection methods
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 method enables highly accurate and efficient DNA sequencing with long read lengths, overcoming the limitations of optical detection by providing rapid and precise determination of nucleic acid sequences, suitable for de novo genome assembly and improving sequencing speed and sensitivity.
Implementation Method 1
detecting electrical signals arising from a target biomolecule as the target biomolecule traverses a nanopore or fluidic channel
Implementation Method 2
an electrophoretic force for translocation of the target biomolecule from the first fluid chamber to the second fluid chamber
Data Source
AI summary
Devices and methods for detecting the length of analytes and/or sequencing analytes are provided in which two or more electrical signals are obtained as an analyte traverses a nanopore or fluidic channel. Detection of the relative position of probes hybridized to a biomolecule and/or the length of the analyte (e.g., a biomolecule) rely on detection events to determine a distance associated with the biomolecule. Multiple signals may be obtained (e.g., as functions of time) corresponding to a plurality of detector volumes at known locations along a fluidic channel through which the biomolecule passes, and the distances may be determined from the multiple signals.