Nanoscale Electrode Redox Sequencing for Real-Time Nucleic Acid Analysis
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Solution Overview
Problem
Current nucleic acid sequencing methods lack efficient non-optical real-time single molecule sequencing technologies that can provide accurate and cost-effective sequencing with improved throughput.
Innovation Solution
The development of a method using nanoscale electrodes with a polymerase enzyme complex and redox-labeled nucleotide analogs, where voltages are applied to oxidize and reduce the labels, allowing current monitoring to determine nucleotide incorporation and sequence, utilizing a substrate with oxidizing and reducing electrodes to identify nucleotides through redox events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical labels are used for sequencing, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces optical detection systems with an electrochemical detection system using redox labels. Nucleotide analogs are labeled with redox-active groups that undergo oxidation-reduction reactions, generating electrical signals that can be detected by electrodes. This substitution eliminates the need for complex optical components while maintaining detection capability through electrochemical signal transduction.
Solution Approach 2:
The patent changes the detection parameter from optical properties to electrochemical properties. By using redox labels that generate electrical signals during nucleotide incorporation, the system transitions from optical detection to electrochemical detection. This parameter change simplifies the overall system while providing real-time monitoring of sequencing reactions.
2Measurement precision
If traditional sequencing methods are used, then accuracy is maintained, but throughput is limited and costs are high
Solution Approach 1:
The patent enables continuous real-time monitoring of nucleotide incorporation through electrochemical detection. The redox labels continuously generate signals as nucleotides are incorporated by polymerase, allowing uninterrupted sequencing data collection. This continuous detection approach eliminates the need for intermittent measurements and significantly increases sequencing throughput while maintaining accuracy.
Solution Approach 2:
The redox labels automatically generate detectable signals during the polymerase-mediated nucleotide incorporation process. The electrochemical detection system requires minimal external intervention, as the incorporation events themselves produce the detection signals through redox reactions. This self-generating signal approach simplifies the sequencing process and enables high-throughput operation.
3Device complexity
If non-optical detection methods are developed, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent replaces complex optical detection systems with a simpler electrochemical detection system. Redox labels attached to nucleotide analogs undergo oxidation-reduction reactions that generate electrical signals directly detectable by electrodes. This substitution maintains detection precision through reliable electrochemical signal transduction while significantly reducing device complexity by eliminating optical components.
Solution Approach 2:
The redox labels serve as intermediaries that convert the chemical event of nucleotide incorporation into an electrical signal. These labels attach to nucleotide analogs and undergo redox reactions during incorporation, mediating the transduction from chemical to electrical domain. This intermediary mechanism ensures accurate detection while using a simpler electrochemical system rather than complex optical instrumentation.
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 real-time, accurate nucleic acid sequencing with improved throughput and reduced costs by utilizing nanoscale electrodes to monitor redox events, providing a non-optical method for determining nucleotide sequences.
Implementation Method 1
when a nucleotide analog resides in the active site of the enzyme, a redox label is oxidized by the oxidizing nanoscale electrode
Implementation Method 2
reduced by the reducing nanoscale electrode
Implementation Method 3
monitoring the current at the oxidizing nanoscale electrode and at the reducing nanoscale electrode over time, whereby the current from multiple oxidations and reductions of a redox label at the electrodes indicates an incorporation event
Data Source
AI summary
Real time redox sequencing methods, devices, and systems are described. Arrays of redox devices comprising one or two electrodes are used to provide sequence information about a template nucleic acid in a polymerase-template complex bound proximate to the electrode(s). A sequencing reaction mixture comprising nucleotide analogs comprising redox labels is introduced to the array of redox devices under conditions of polymerase mediated nucleic acid synthesis. The time sequence of incorporation of nucleotide analogs is determined by electrochemically identifying the redox labels of the nucleotide analogs that are incorporated into the growing strand.