Single-Molecule Real-Time Sequencing via Optical Confinement
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Solution Overview
Problem
Current methods for analyzing biological processes, such as monitoring therapeutically relevant biological pathways, often lose information due to averaging bulk reactions, making it difficult to tease out individual molecular complex activities and effects.
Innovation Solution
A method involving single-molecule real-time analysis using optical confinement techniques, like zero mode waveguides, to sequence mRNA transcripts by immobilizing them with sequencing engines and detecting the incorporation of labeled nucleotides, allowing for detailed sequence determination and base modification analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bulk reactions are used to monitor biological pathways, then general trends and bulk system responses can be ascertained, but substantial information is lost in the averaging process and individual molecular complex activities cannot be resolved
Solution Approach 1:
The patent applies segmentation by transitioning from bulk reaction analysis to single-molecule analysis. Each optical confinement site isolates and analyzes individual molecular complexes, dividing the bulk population into discrete, individually monitorable units. This enables resolution of heterogeneous behaviors among individual complexes that are masked in bulk measurements.
Solution Approach 2:
The patent uses optical confinement sites to create multiple isolated copies of the same reaction system, allowing parallel single-molecule analysis. Each confinement site contains a copy of the biological pathway components, enabling simultaneous monitoring of many individual complexes without requiring separate physical samples.
2Measurement precision
If single-molecule real-time analysis is performed using optical confinement, then individual molecular complex activities can be resolved with high precision, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces complex mechanical confinement structures with optical confinement using evanescent waveguides and total internal reflection. This substitution simplifies the physical implementation while maintaining single-molecule isolation capability, as optical fields can be confined without requiring complex mechanical barriers or chambers.
Solution Approach 2:
The optical confinement system serves multiple functions simultaneously: it provides single-molecule isolation, enables real-time monitoring, allows parallel analysis of many complexes, and maintains biological activity. This multi-functionality reduces the need for separate specialized components, thereby managing overall system complexity.
3Ease of operation
If bulk reaction monitoring is used, then the analysis system remains simple and easy to operate, but the ability to identify specific base modifications and secondary structures is lost
Solution Approach 1:
The patent employs fluorescent labeling and detection of optical signals to identify base modifications and secondary structures. Different fluorescent labels or signal characteristics indicate specific modifications (e.g., methylation, pseudouridine) or structural features, enabling detection without complicating the overall operational protocol.
Solution Approach 2:
The system incorporates real-time optical feedback to detect incorporation events, pauses, and structural changes during nucleic acid synthesis. This feedback mechanism provides immediate information about base modifications and secondary structures as they affect polymerase activity, maintaining operational simplicity while enabling detailed molecular characterization.
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
Enables precise determination of mRNA transcript sequences and base modifications, providing insights into biological reactions and potential therapeutic interventions with high resolution and accuracy.
Implementation Method 1
The complex is immobilized in an optical confinement
Implementation Method 2
a sequencing-by-synthesis reaction is performed and a sequence of incorporation of the labeled nucleotides into a nascent polynucleotide complementary to the mRNA transcript is detected
Data Source
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AI summary
The present invention is generally directed to compositions, methods, and systems for performing single-molecule, real-time analysis of a variety of different biological reactions. The ability to analyze such reactions provides an opportunity to study those reactions as well as to potentially identify factors and/or approaches for impacting such reactions, e.g., to either enhance or inhibit such reactions. In certain preferred embodiments, RNA templates are used in single-molecule real-time sequencing reactions.