Electrochemical Sequencing via Redox Mediators
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Solution Overview
Problem
Current nucleic acid sequencing technologies face challenges such as high cost, complexity, and scalability issues, particularly in large-scale genome projects, due to shortcomings in sample preparation, accuracy, and sensitivity to bead movements in existing detection methods.
Innovation Solution
The use of a system and method that detects nucleic acid sequencing reactions using redox mediator moieties with electronic sensors, eliminating the need for beads by employing a sensing fluid with specific conductivity levels to reduce sensitivity to bead movements and enable low-cost, scalable sequencing, where nucleotides are incorporated into a growing strand and detected through changes in conductivity or impedance within a Debye layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent nucleotide detection or proton byproduct detection methods are used, then sequencing accuracy can be achieved, but the system complexity and cost increase significantly
Solution Approach 1:
The patent extracts and eliminates the bead component from the sequencing system. By detecting nucleotide incorporation directly in solution using electrochemical sensors, the invention removes the complex bead handling, immobilization, and detection infrastructure required in traditional systems, thereby reducing device complexity while maintaining sequencing accuracy through direct electrochemical detection of incorporation events
Solution Approach 2:
The patent replaces mechanical/optical detection systems (fluorescent beads, optical sensors) with an electrochemical detection system. By using electrodes to detect current changes or impedance variations caused by nucleotide incorporation, the invention substitutes complex optical/mechanical infrastructure with a simpler electrochemical approach that maintains measurement precision while reducing system complexity
2Productivity
If traditional sequencing technologies are implemented, then sequencing can be performed, but scalability and cost-effectiveness deteriorate for large-scale genome projects
Solution Approach 1:
The patent employs a sensor array composed of multiple independent sensing elements that can simultaneously process multiple sequencing reactions. This segmentation allows parallelization of sequencing operations, enabling scalable throughput for large-scale genome projects while maintaining cost-effectiveness through efficient resource utilization across multiple sensing channels
Solution Approach 2:
The invention uses self-assembling DNA structures and autonomous nucleotide incorporation reactions that proceed without complex external manipulation. The electrochemical sensors passively detect incorporation events as they occur naturally in solution, eliminating the need for complex sample preparation, bead handling, and washing steps, thereby reducing manufacturing complexity and cost while enabling scalable deployment
3Measurement precision
If bead-based detection systems are used, then signal detection is possible, but sensitivity to bead movements creates measurement errors
Solution Approach 1:
The patent removes beads from the detection system entirely, performing nucleotide incorporation detection directly in solution. By eliminating the bead component, the invention eradicates the source of movement-related signal instability while maintaining detection sensitivity through direct electrochemical measurement of incorporation events at the electrode surface
Solution Approach 2:
The patent introduces redox mediators as intermediary molecules that facilitate electron transfer between the incorporating polymerase-nucleotide complex and the electrode surface. These mediators enable sensitive detection of incorporation events while the system remains insensitive to physical movements, as the electrochemical signal depends on molecular proximity and electron transfer kinetics rather than physical position
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 accurate, affordable, and scalable nucleic acid sequencing by reducing the complexity and cost of sample preparation, improving sensitivity to nucleotide incorporation events, and enabling efficient data generation for clinical applications.
Implementation Method 1
the sensing fluid has a bulk conductivity and a surface of the bead has a surface conductivity to provide a Dukhin number that is less than about 1
Implementation Method 2
detect a change in conductivity within a Debye layer of the bead upon incorporation of at least one nucleotide
Implementation Method 3
using the sensor to detect a change in conductivity within a Debye layer of the bead upon incorporation of at least one nucleotide
Implementation Method 4
detecting a change in impedance within the Debye layer of the bead upon incorporation of the at least one nucleotide
Implementation Method 5
The present disclosure provides systems and methods that make use of redox mediator moieties that are detectable using electronic sensors to perform nucleic acid sequencing
Data Source
AI summary
Provided herein are systems and methods for processing and analyzing nucleic acids and other biomolecules. Methods may include processing nucleic acid molecules in an emulsion of droplets. Methods of analyzing nucleic acid molecules may include coupling nucleic acids to a bead or other support. Methods may include analysis of nucleic acid molecules using a redox mediator. In some cases, analysis of the nucleic acid molecule includes determining a nucleotide sequence of the nucleic acid molecule.