Stabilizing Fluid for Binding Assay Background Reduction

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Solution Overview

Problem

Existing biotechnological methods for detecting reversible multicomponent complexes, such as those in Sequencing By Binding assays, face challenges in maintaining signal stability due to high background signals from non-complexed labeled reagents and the dynamic nature of these complexes, which can lead to dissociation and loss of specific complex detection.

Innovation Solution

The method involves immobilizing the complex and using a stabilizing fluid in which the labeled reagents are insoluble, allowing for the removal of non-complexed components while maintaining the integrity of the complex, thereby enhancing signal-to-background ratios and stabilizing the complex for extended periods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If washing is performed to deplete free labeled reagents, then background signal is reduced, but complex stability deteriorates due to dissociation

Engineering Contradiction:

Improvebackground signalVSAvoidcomplex stability

Core Design Contradiction:

Object-generated harmful factorsVSStability of the object's composition

Solution Approach 1:

A stabilizing fluid is introduced as an intermediary substance that simultaneously interacts with both the complex and the free reagents. This fluid mediates the washing process by selectively stabilizing the complex while allowing free reagents to be removed, thus resolving the contradiction between background reduction and complex stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical or physical parameters of the washing environment by introducing a stabilizing fluid with specific properties (e.g., altered pH, ionic strength, or chemical composition). This parameter change enables the complex to remain stable while free reagents are depleted, addressing both requirements.

Inventive Principle:

Principle #35Parameter changes

2Difficulty of detecting and measuring

If labeled components are used to detect complexes, then detection capability is improved, but signal-to-background ratio deteriorates due to non-complexed reagents

Engineering Contradiction:

Improvedetection capabilityVSAvoidsignal-to-background ratio

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The stabilizing fluid selectively extracts or removes free labeled reagents from the solution while leaving the complex intact. This extraction process eliminates the source of background signal while preserving the detection capability provided by labeled components in the complex.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The stabilizing fluid acts as an intermediary that selectively interacts with free reagents to remove them from the detection environment, while having minimal or stabilizing interaction with the complex. This selective mediation improves the signal-to-background ratio without compromising detection capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If transient binding complexes are monitored, then kinetic information is obtained, but complex dissociation increases leading to loss of signal

Engineering Contradiction:

Improvekinetic assessmentVSAvoidsignal reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces a dynamic stabilization mechanism where the stabilizing fluid continuously maintains complex integrity during monitoring. This dynamic approach allows kinetic assessments to be performed while preventing dissociation, thus maintaining signal reliability throughout the experiment.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The stabilizing fluid provides beforehand cushioning by pre-establishing conditions that prevent complex dissociation before it can occur. This protective measure ensures signal reliability is maintained throughout the kinetic monitoring process.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 significantly reduces background signals and maintains the stability of ternary complexes, enabling reliable detection of specific interactions over time, even for extended periods, improving the accuracy of sequencing results.

Implementation Method 1

contacting the immobilized receptor-ligand complex that formed in step (a) with a stabilizing fluid, wherein the test ligand is substantially insoluble in the stabilizing fluid

Methodology Applied

Scientific EffectInsolubility:

Implementation Method 2

enhancing signal-to-background ratios and stabilizing the complex for extended periods

Methodology Applied

Scientific EffectStabilization:

Data Source

PatentUS20220056516A1Simultaneous background reduction and complex stabilization in binding assay workflows

Publication Date: 2022.02.24 PACIFIC BIOSCIENCES OF CALIFORNIA INC

AI summary

Method and apparatus to facilitate separation of solution-phase components surrounding an immobilized multicomponent complex while stabilizing association of the components within the complex. The technique can be used for reducing background signal arising from the presence of non-complexed components harboring detectable labels, thereby enhancing signal-to-background ratios and allowing enhanced detection of the multicomponent complex.