Intermittent Detection for Nucleic Acid Sequencing
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Solution Overview
Problem
Current analytical techniques face challenges in maintaining reaction performance due to photo-induced damage from light sources, especially in low reactant volumes used in microfluidic or nanofluidic systems, and difficulties in sequencing noncontiguous portions of long nucleic acid templates, particularly those with repetitive sequences.
Innovation Solution
Implementing intermittent detection methods to reduce photo-induced damage and enhance reaction performance by alternating between detection and non-detection periods, allowing for data collection from previously inaccessible regions of a reaction and improving processivity, rate, and fidelity of sequencing reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous detection is performed using optical energy sources, then real-time monitoring of analytical reactions is achieved, but photo-induced damage to reactants occurs
Solution Approach 1:
The patent implements periodic illumination cycles that alternate between detection periods (when optical energy is applied to monitor the reaction) and non-detection periods (when illumination is paused to allow reactant recovery). This periodic action resolves the contradiction by ensuring that detection occurs only when necessary, while preventing continuous photo-damage accumulation that would degrade reaction performance over time.
2Productivity
If smaller reactant volumes are used in microfluidic or nanofluidic systems, then high throughput applications are enabled, but signal generation capability is reduced
Solution Approach 1:
By using periodic illumination with alternating detection and non-detection periods, the system maintains reactant integrity throughout the reaction. This ensures that even in small volumes, the reactants remain active and capable of generating detectable signals throughout the entire reaction duration, thereby maintaining signal generation capability while enabling high throughput applications.
Solution Approach 2:
The periodic detection approach ensures continuous monitoring capability across multiple illumination cycles, allowing the system to accumulate signal information over time from small reactant volumes. This maintains the useful detection action throughout the reaction while preserving reactant activity.
3Measurement precision
If prolonged exposure to light sources is applied, then detectability of reaction components is improved, but damage to chemical and biochemical reactants increases
Solution Approach 1:
The patent employs periodic illumination cycles that provide sufficient optical energy during detection periods to ensure adequate signal detectability, while interrupting illumination during non-detection periods to prevent cumulative photo-damage. This resolves the contradiction by delivering the necessary detection energy without exceeding the damage threshold over prolonged exposure.
4Object-affected harmful factors
If intermittent detection is implemented, then photo-induced damage is reduced, but data collection continuity is interrupted
Solution Approach 1:
The system maintains continuous reaction progression throughout both detection and non-detection periods, ensuring that the analytical reaction proceeds uninterrupted. While data collection is paused during non-detection periods, the reaction continues to advance, and multiple detection cycles accumulate sufficient data over time, thereby maintaining overall data collection effectiveness despite intermittent sampling.
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 reliable data collection from previously inaccessible regions of a reaction, increases the flexibility of data collection, and improves the ability to generate noncontiguous sequence reads from long nucleic acid templates, thereby enhancing the performance and accuracy of analytical reactions.
Implementation Method 1
analyses based on fluorescent labeling groups generally require the use of an excitation radiation source directed at the reaction mixture to excite the fluorescent labeling group, which is then separately detectable
Data Source
AI summary
Methods, devices, and systems for performing intermittent detection during analytical reactions are provided. Such methods facilitate collection of reaction data from disparate reaction times. Further, such methods are useful for reducing photo-induced damage of one or more reactants in an illuminated analytical reaction at a given reaction time. In preferred embodiments, the reaction mixture is subjected to at least one illuminated and non-illuminated period and allowed to proceed such that the time in which the reaction mixture is illuminated is less than a photo-induced damage threshold period.