Spin Torque Oscillator Sensors for Optical-Free 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 and expensive optical scanning systems, constrained by the Rayleigh criterion, which limits the minimum distance between DNA strands and requires super-resolution imaging techniques that have not been achieved in highly multiplexed systems.
Innovation Solution
The use of spin torque oscillators (STOs) and magnetic nanoparticles (MNPs) to detect nucleic acids, where STOs oscillate at specific frequencies in response to MNPs, allowing for the detection of nucleic acid sequencing through changes in magnetization oscillations, enabling the identification of nucleotide precursors and DNA strands without the need for fluorescence-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical imaging systems with high numerical aperture lenses are used to increase DNA testing site density, then the number of sequenced DNA strands in a fixed-size flow cell increases, but the minimum distance between two sequenced DNA strands is constrained to no smaller than approximately 400 nm due to the Rayleigh criterion
Solution Approach 1:
The patent replaces the optical imaging system with a magnetic sensing system. Instead of using light and lenses to detect fluorescent signals from DNA strands, the invention uses magnetic nanoparticles attached to DNA strands and detects them via magnetic field sensing, eliminating the diffraction limit constraint of optical systems.
Solution Approach 2:
The patent changes the detection parameter from optical fluorescence detection to magnetic field detection. By attaching magnetic nanoparticles to DNA strands and using magnetic sensors to detect their position and movement, the system achieves higher spatial resolution without being constrained by the Rayleigh criterion.
2Productivity
If large-area flow cells and high-power lasers are used to achieve high throughput of 20 billion reads per run, then sufficient fluorescence signals for base detection are generated, but the cost of reagents and the price of the sequencing system increase
Solution Approach 1:
The patent replaces the expensive optical detection system requiring high-power lasers and complex imaging optics with a magnetic sensing system. This substitution eliminates the need for costly optical components while maintaining high throughput capability through parallel magnetic sensing of multiple DNA strands.
Solution Approach 2:
The patent uses magnetic nanoparticles as disposable labels attached to DNA strands. These inexpensive magnetic particles replace expensive fluorescent labels and eliminate the need for costly laser systems, enabling high throughput at lower cost.
3Manufacturing precision
If super-resolution imaging techniques are applied to overcome the Rayleigh criterion, then the distance between resolvable light point sources can be reduced, but these techniques have not yet been achieved in highly multiplexed systems
Solution Approach 1:
The patent avoids the complexity of implementing super-resolution optical techniques by substituting optical detection with magnetic field detection. Magnetic sensing inherently provides higher spatial resolution without requiring complex computational algorithms or specialized optical components, making it suitable for highly multiplexed sequencing applications.
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 efficient and cost-effective nucleic acid sequencing by overcoming the spatial resolution limitations of optical systems, enabling higher throughput and reducing the complexity and expense of sequencing technologies.
Implementation Method 1
magnetoresistive (MR) sensor arrays for detection of molecules coupled to magnetic nanoparticles (MNPs)
Implementation Method 2
sensors with STOs that allow for detection of characteristics indicating the presence or absence of MNPs near sensors
Data Source
AI summary
Disclosed herein is a detection device comprising sensors with spin torque oscillators (STOs), at least one fluidic channel configured to receive molecules to be detected, and detection circuitry coupled to the sensors. At least some of the molecules to be detected are labeled by magnetic nanoparticles (MNPs). The presence of one or more MNPs in the vicinity of a STO subjected to a bias current changes the oscillation frequency of the STO. The sensors are encapsulated by a material, such as an insulator, separating the sensors from the at least one fluidic channel. A surface of the material provides binding sites for the molecules to be detected. The detection circuitry is configured to detect changes in the oscillation frequencies of the sensors in response to presence or absence of one or more MNPs coupled to one or more binding sites associated with the sensors.