FRET-Labeled Reaction Monitoring for Unambiguous Component Detection

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Solution Overview

Problem

Existing analytical methods using labeled molecules in biological reactions face issues such as steric interference, impact on reaction conditions, and complexity in data analysis due to multiple labels, which affect the ability to accurately monitor and analyze complex biological systems.

Innovation Solution

The use of FRET labels comprising at least two chromophores that undergo Förster resonance energy transfer, configured to achieve specific emission spectra for unambiguous identification of reaction components, allowing for distinct emission intensities and spectra even in the presence of variations in FRET efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple different labels are used to monitor multiple different reaction constituents, then the ability to identify different reaction components is improved, but the complexity of data analysis increases and variability in label performance adversely affects reaction monitoring

Engineering Contradiction:

Improveidentification accuracyVSAvoiddata analysis complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies universality by using a single fluorescent label that can monitor multiple different reaction constituents simultaneously. The label is designed to bind to different nucleotide analogs (A, T, G, C) and produce distinguishable emission spectra through conformational changes, eliminating the need for multiple different labels and simplifying data analysis while maintaining identification accuracy

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent utilizes parameter changes by detecting variations in emission spectra (wavelength, intensity, shape) that occur when the fluorescent label binds to different nucleotide analogs. These spectral parameter changes provide unambiguous identification of each reaction component, replacing the need for multiple distinct labels with a single label that exhibits variable spectral characteristics

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If large hydrophobic labeling groups are attached to model reaction constituents, then the ability to detect and identify reaction components is improved, but steric interference with the reaction progress occurs

Engineering Contradiction:

Improvedetection capabilityVSAvoidsteric interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent employs a small, minimal fluorescent label that does not persistently interfere with the reaction. The label is designed to bind transiently to nucleotide analogs during the reaction and can be easily removed or diluted, functioning as a temporary detection tool rather than a permanent structural modification that would cause ongoing steric interference

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent applies local quality by using a small fluorescent label with specific binding properties that interacts locally with the target nucleotide analogs without imposing bulk steric effects. The label's minimal size and targeted binding ensure detection capability while avoiding harmful steric interference with the overall reaction progress

Inventive Principle:

Principle #3Local quality

3Productivity

If fluorescent molecules are placed in close proximity to enzymatic reaction components, then the ability to monitor reactions in real-time is improved, but photo-chemically induced reaction intermediates cause decay in enzyme activity

Engineering Contradiction:

Improvereal-time monitoring capabilityVSAvoidenzyme activity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent uses the fluorescent label as an intermediary that binds to the nucleotide analogs rather than placing the fluorescent molecule directly adjacent to the enzyme. This intermediary approach allows real-time monitoring of reaction products while maintaining sufficient distance from the enzymatic active site to prevent photo-chemical damage to the enzyme

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent extracts the fluorescent detection function from the enzyme itself and places it on the nucleotide analog substrate. By attaching the fluorescent label to the nucleotide analog rather than positioning it near the enzyme, the monitoring function is separated from the catalytic function, enabling real-time detection while protecting enzyme activity from photo-chemical interference

Inventive Principle:

Principle #2Taking out (Extraction)

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 efficient and accurate monitoring of individual reaction components in real-time, reducing interference and complexity, and allowing for unambiguous identification of multiple labeled compounds in analytical reactions.

Implementation Method 1

Methodology Applied

Scientific EffectFörster resonance energy transfer (FRET):

Data Source

PatentUS12448647B2Methods of monitoring a reaction

Publication Date: 2025.10.21 PACIFIC BIOSCIENCES OF CALIFORNIA INC

AI summary

Reaction mixtures are provided having at least a first reactant and a second reactant that produce signals in response to excitation illumination. The signals produced by the reactants have peaks at the same wavelengths, but have distinct signal intensities. In some embodiments, the reactants are FRET-labeled.