Nanochip DNA Sequencing via Capacitive Variance
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Solution Overview
Problem
Current DNA data storage methods using nanopore devices face challenges in accurately and reliably reading DNA data due to the fast movement of DNA through nanopores and the low signal-to-noise ratio of small changes in current or capacitance, leading to unreliable and inefficient data retrieval from DNA molecules.
Innovation Solution
A nanochip system with nanofluidic chambers and nanopores is developed, allowing for the synthesis and rapid sequencing of long DNA strands using adenine and cytosine nucleotides, which are easier to distinguish and do not form secondary structures, enabling high-speed and accurate data reading through capacitive variance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DNA moves through nanopore at high speed (one million bases per second), then productivity is improved, but measurement precision deteriorates due to inability to read accurately
Solution Approach 1:
The patent introduces a protein nanopore as an intermediary component that interacts with the DNA molecule during translocation. The protein nanopore provides specific binding sites and interaction mechanisms that slow down DNA passage while maintaining directional flow, enabling accurate base-by-base detection without requiring mechanical slowing mechanisms
Solution Approach 2:
The patent changes the physical and chemical parameters of the nanopore environment, including pore diameter, surface charge distribution, and electrostatic field configuration, to optimize the balance between translocation speed and detection accuracy. These parameter adjustments create optimal conditions for both high-speed processing and precise measurement
2Device complexity
If small changes in current or capacitance are measured to detect DNA bases, then device complexity is reduced, but reliability deteriorates due to low signal-to-noise ratio
Solution Approach 1:
The patent applies oscillating electric fields and vibrational mechanisms to the detection system to amplify the signal generated by DNA translocation. The vibration-based detection method converts subtle current changes into larger, more detectable signals through resonant amplification, significantly improving the signal-to-noise ratio while maintaining electrical measurement simplicity
Solution Approach 2:
The patent employs periodic measurement cycles with alternating detection phases and baseline calibration phases. This periodic action allows the system to distinguish true DNA-induced signals from random noise through temporal pattern recognition, enhancing reliability without adding complex continuous monitoring mechanisms
3Loss of information
If conventional DNA sequencing methods are used with four nucleotide base types, then information density is maintained, but productivity deteriorates due to slower and less accurate sequencing
Solution Approach 1:
The patent modifies the chemical parameters of the nucleotide bases by using modified base types with distinct physical properties such as different charge distributions, sizes, or binding affinities. These parameter changes enable faster discrimination between bases during translocation while preserving the information-coding capability, achieving both high information density and improved sequencing efficiency
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 enables high-quality, reliable, and scalable DNA data reading, with the ability to store and retrieve data from long DNA strands with a higher information density and faster sequencing rates compared to existing methods.
Implementation Method 1
typically a nanopore is used in a fluid-filled cell to read the DNA data by measuring a change in current as the DNA passes through the nanopore
Implementation Method 2
Measurements based on changes in capacitance have been proposed but are not commercial; the changes are in the range of pico/fempto/atto-farads
Implementation Method 3
Each reaction chamber comprises an electrolytic fluid, one or more electrodes to draw the electrically charged polymer into the chamber
Data Source
AI summary
Methods, systems and devices for reading data stored in a polymer (e.g., DNA) and for verifying the sequence of a polymer synthesized in situ in a nanopore-based chip, include providing a resonator having an inductor and a cell, the cell having a nanopore and a polymer that can traverse through the nanopore, the resonator having an AC output voltage frequency response at a probe frequency in response to an AC input voltage at the probe frequency, providing the AC input voltage having at least the probe frequency, and monitoring the AC output voltage at least at the probe frequency, the AC output voltage at the probe frequency being indicative of the data stored in the polymer at the time of monitoring, wherein the polymer includes at least two monomers having different properties causing different resonant frequency responses.