Magnetic Sensor Arrays for Nucleic Acid Sequencing
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Solution Overview
Problem
Current nucleic acid sequencing technologies face limitations in throughput and cost due to resolution constraints of fluorescence microscopy and CMOS imagers, requiring large and expensive optical systems for high-power lasers and high-precision optics.
Innovation Solution
The use of magnetic sensor arrays with magnetically-labeled nucleotide precursors and miniaturized magnetic field sensors to detect nanoscale magnetic nanoparticles, eliminating the need for high-power lasers and high-resolution optics, and enabling inward scaling of sequencing systems by a factor of approximately 100.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence signal detection is used to sequence DNA, then base detection can be achieved, but large-area flow cells, high-precision free-space imaging optics, and expensive high-power lasers are required
Solution Approach 1:
The patent replaces the optical detection system (fluorescence microscopy, lasers, imaging optics) with a magnetic detection system using magnetically-labeled nucleotides and magnetic sensors. This substitution eliminates the need for complex optical components while maintaining the ability to detect incorporated bases during sequencing by synthesis
Solution Approach 2:
The invention changes the detection parameter from optical fluorescence signals to magnetic field signals. By labeling nucleotides with magnetic particles instead of fluorescent dyes and detecting them with magnetic sensors, the system achieves base detection without requiring high-power lasers and high-precision optics
2Productivity
If inward scaling is used to reduce the size of individual DNA testing sites, then the number of sequenced DNA strands increases, but the Rayleigh criterion limits the minimum distance between two sequenced DNA strands to approximately 400 nm
Solution Approach 1:
The patent replaces optical imaging with magnetic sensing, which is not constrained by the Rayleigh criterion. Magnetic sensors can detect magnetic labels at much smaller distances, enabling DNA strands to be positioned closer together (beyond the 400 nm optical resolution limit) while maintaining detectable signal separation
Solution Approach 2:
The invention transitions from optical detection in three-dimensional space to magnetic field detection that can operate at nanoscale distances. This dimensional transition allows for higher density packing of DNA strands in the flow cell without compromising the ability to distinguish between adjacent labels
3Productivity
If outward scaling is used to increase the size and number of flow-cells, then sequencing throughput increases, but the cost of reagents and the price of the sequencing system increase due to additional high-power lasers and high-precision nano-positioners
Solution Approach 1:
The patent replaces expensive optical components (high-power lasers, high-precision nano-positioners, free-space imaging optics) with magnetic sensing components. This substitution maintains the ability to sequence millions of clusters in parallel while eliminating the need for costly optical infrastructure
Solution Approach 2:
The magnetic sensor array can detect multiple magnetic labels simultaneously without requiring additional optical resources. A single magnetic detection system can handle multiple flow-cells or larger flow-cell areas without proportionally increasing cost, as the magnetic sensors do not require high-power lasers or precision positioning mechanisms
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 significantly increases sequencing throughput while reducing costs, providing a higher signal-to-noise ratio and allowing for more dense multiplexing without the need for expensive optical components.
Implementation Method 1
magnetic sensor arrays with magnetically-labeled nucleotide precursors and miniaturized magnetic field sensors to detect nanoscale magnetic nanoparticles
Data Source
AI summary
Methods of detecting molecules using an apparatus comprising a plurality of magnetic sensors are disclosed. A method may include binding a first molecule to a proximal wall of a fluid chamber of the apparatus, and adding, to the fluid chamber, a magnetically-labeled molecule comprising a cleavable magnetic label, wherein the magnetically-labeled molecule is configured to bind to or be incorporated by the first molecule. The method may use at least one address line and at least one selector element of the apparatus to detect a characteristic of at least a portion of the plurality of magnetic sensors, wherein the characteristic indicates whether the magnetically-labeled molecule has bound to or been incorporated by the first molecule.