STO Sensor Arrays for High-Density Magnetic DNA Sequencing
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Solution Overview
Problem
Current nucleic acid sequencing systems face limitations in throughput and cost due to the need for large flow cells, high-precision optics, and expensive lasers, with the Rayleigh criterion constraining the minimum distance between DNA strands, making it difficult to increase sequencing density and efficiency.
Innovation Solution
The use of spin torque oscillators (STOs) and magnetic nanoparticles (MNPs) to detect nucleic acids, allowing for the identification of molecules by detecting changes in magnetization oscillations in response to magnetic fields, enabling more efficient and cost-effective sequencing without the need for high-power lasers or complex optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence signal detection is used for nucleic acid sequencing, then base detection can be achieved, but large-area flow cells, high-precision optics, and expensive high-power lasers are required
Solution Approach 1:
The patent replaces the optical detection system with a magnetic detection system. Instead of using fluorescence signals that require complex optics and lasers, the invention uses magnetic nanoparticles attached to nucleic acids that can be detected by magnetic sensors (such as GMR or TMR sensors). This substitution eliminates the need for high-power lasers, high-precision free-space imaging optics, and large-area flow cells, while maintaining the capability to detect and identify nucleic acid bases.
2Productivity
If the density of DNA testing sites is increased to achieve inward scaling, then sequencing throughput increases, but the Rayleigh criterion constrains the minimum distance between DNA strands
Solution Approach 1:
The patent replaces optical detection with magnetic detection, which has fundamentally different resolution characteristics. Magnetic sensors can detect the magnetic field of individual magnetic nanoparticles with high sensitivity, enabling denser packing of DNA testing sites without the Rayleigh criterion limitation that constrains optical systems. This allows inward scaling to continue beyond the ~400 nm minimum distance constraint of optical systems.
Solution Approach 2:
The invention changes the detection parameter from optical fluorescence signals to magnetic field signals. By attaching magnetic nanoparticles to nucleic acids and detecting their magnetic fields using highly sensitive magnetic sensors, the system achieves superior spatial resolution that enables higher density of testing sites, thereby increasing sequencing throughput without being constrained by optical diffraction limits.
3Measurement precision
If high-power lasers are used to generate sufficient fluorescence signals, then base detection sensitivity is improved, but system cost increases
Solution Approach 1:
The patent substitutes expensive high-power lasers and complex optical systems with relatively inexpensive magnetic sensors. The magnetic detection system uses sensors such as giant magnetoresistance (GMR) or tunnel magnetoresistance (TMR) sensors that can detect the magnetic fields of nanoparticles without requiring high-power lasers, thereby significantly reducing system cost while maintaining or improving detection sensitivity.
Solution Approach 2:
The invention uses magnetic nanoparticles as disposable labels attached to nucleic acids. These nanoparticles are inexpensive compared to the high-power lasers and precision optics required for fluorescence detection. The magnetic nanoparticles serve their detection purpose and can be discarded, providing a cost-effective alternative to expensive optical detection infrastructure.
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 allows for improved nucleic acid sequencing by enabling the detection of nucleic acids with increased density and efficiency, overcoming the limitations of conventional systems by using magnetic sensors to identify molecules based on magnetization changes, thus enhancing throughput and reducing costs.
Implementation Method 1
sensors with spin torque oscillators (STOs) that allow for detection of characteristics indicating the presence or absence of MNPs near sensors
Implementation Method 2
detecting changes in magnetization oscillations in response to magnetic fields
Data Source
AI summary
Disclosed herein are methods and apparatuses for sequencing nucleic acids using a detection device, the detection device comprising a plurality of spin torque oscillators (STOs) and at least one fluidic channel. In some embodiments of a method, a nucleotide precursor is labeled with a magnetic nanoparticle (MNP), and the labeled nucleotide precursor is added to the fluidic channel of the detection device. It is determined whether at least one of the plurality of STOs is generating a signal. Based at least in part on the determination of whether the at least one of the plurality of STOs is generating the signal, it is determined whether the labeled nucleotide precursor has been detected.