Field Switch Sequencing Nanoparticle Transport
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Solution Overview
Problem
Current DNA sequencing methods, particularly those using the dideoxy chain termination method, face challenges in achieving long read lengths and high throughput while maintaining cost-effectiveness, with non-sizing sequencing methods suffering from short read lengths and synchronization issues due to incomplete reactions.
Innovation Solution
The development of field-switch sequencing using charged nanoparticles that carry nucleotide phosphates, allowing for simultaneous sequencing of multiple DNA molecules in a microtiter plate with read lengths of 5-20 kilobases, utilizing an electric field to transport particles and enhance sequencing efficiency and multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dideoxy chain termination method is used, then sequencing throughput is improved, but read length is limited
Solution Approach 1:
The patent divides the sequencing process into discrete cycles where fluorescently labeled nucleotides are added sequentially. Each cycle captures a specific nucleotide incorporation event, and the fluorescent signal is detected and recorded. This segmentation allows the system to maintain high throughput by processing many molecules simultaneously while achieving long read lengths by accumulating data across thousands of cycles.
Solution Approach 2:
The patent implements continuous imaging and data collection throughout the sequencing process. The camera system continuously captures fluorescent signals from all DNA molecules in the flow cell, and the system continuously records the sequence data as nucleotides are incorporated. This continuous action enables both high throughput (by processing many molecules in parallel) and long read lengths (by accumulating data without interruption over extended periods).
2Speed
If non-sizing sequencing methods are used, then sequencing speed is improved, but read length decreases
Solution Approach 1:
The patent replaces the mechanical sizing system (gel electrophoresis or capillary electrophoresis) with an optical detection system. Instead of physically separating DNA fragments by size and detecting them sequentially, the system uses fluorescently labeled nucleotides that emit light when incorporated into DNA. This substitution eliminates the read length limitation imposed by physical separation methods while maintaining high sequencing speed through parallel optical detection of thousands of molecules.
3Productivity
If cyclic addition of reagents is used for non-sizing sequencing, then sequencing is achieved, but synchronization is lost due to incomplete reactions
Solution Approach 1:
The patent incorporates feedback mechanisms to monitor and maintain synchronization throughout the sequencing process. The system detects fluorescent signals from each nucleotide incorporation event and uses this information to track the progress of all DNA molecules in parallel. By continuously monitoring the incorporation patterns and comparing them across molecules, the system can identify and correct desynchronization issues, ensuring reliable sequencing even when reaction completion varies slightly between molecules.
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 long-read, high-throughput DNA sequencing with improved cost-effectiveness by allowing the sequencing of hundreds of DNA molecules simultaneously at rates of 10 to 200 nucleotides per second, overcoming limitations of existing methods in read length and synchronization.
Implementation Method 1
utilizing an electric field to transport particles and enhance sequencing efficiency and multiplexing
Data Source
AI summary
The present invention provides novel compositions, methods and apparatus for DNA sequencing that can be performed, e.g., in a two-electrode chamber. The present invention also provides a method for sequencing a nucleic acid comprising immobilizing a plurality of complexes comprising a target nucleic acid, a primer nucleic acid, and a polymerase onto a surface, contacting the surface with a plurality of charged particles comprising a nucleotide phosphate by applying an electric field, reversing the electric field to transport unbound charged particles away from the surface, and detecting the incorporation of a nucleotide phosphate into a single molecule of the primer nucleic acid.