Bispecific Probes for Flow Cytometry Compensation
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Solution Overview
Problem
Current flow cytometry methods face challenges in accurately distinguishing between different fluorophores due to spectral overlap, leading to reduced resolution and increased errors in multi-parameter analysis.
Innovation Solution
The use of bispecific reagents with an anchor probe and a capture probe allows for improved spectral unmixing and compensation by specifically binding to cell surface targets and detection reagents, enabling the generation of a compensation matrix that accounts for spillover effects across multiple detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple fluorophores are used for multi-parameter detection, then the detection capability is improved, but spectral overlap occurs leading to reduced measurement precision
Solution Approach 1:
The patent introduces compensation beads as an intermediary substance that binds to fluorophores and provides a standardized reference signal. These beads serve as a mediator between the fluorophores and detectors, enabling accurate measurement of spectral overlap and facilitating compensation calculations to resolve the spectral resolution issue while maintaining multi-parameter detection capability
Solution Approach 2:
The patent changes the physical parameters of the detection system by introducing compensation controls with known fluorophore concentrations and spectral characteristics. By measuring the actual spectral overlap parameters using these controls and applying mathematical compensation, the system adjusts the detection parameters to eliminate spectral interference while preserving the ability to detect multiple parameters simultaneously
2Measurement precision
If compensation controls are used to correct spectral overlap, then measurement precision is improved, but the complexity of the experimental procedure increases
Solution Approach 1:
The patent implements a self-service approach where the compensation beads automatically provide the necessary reference signals for spectral overlap measurement. The beads contain known concentrations of fluorophores that self-generate the compensation data needed, eliminating the need for complex manual calibration procedures and reducing experimental complexity while maintaining high measurement precision
Solution Approach 2:
The patent performs preliminary action by pre-preparing compensation beads with known fluorophore compositions before the actual experiment. These beads are prepared in advance with standardized fluorophore concentrations, allowing the spectral overlap parameters to be determined beforehand and applied as compensation factors, thereby simplifying the main experimental procedure while ensuring accurate spectral unmixing
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 enhances the resolution sensitivity by at least five percent, allowing for better differentiation between dimly labeled cells and unlabeled cells, and reduces errors associated with spectral overlap, thereby improving the accuracy of multi-parameter flow cytometry analysis.
Implementation Method 1
an anchor probe specifically bound to a cell surface target on the cell
Implementation Method 2
a capture probe capable of specifically binding to the first detection reagent
Implementation Method 3
a first label, wherein the emission spectrum of the first label comprises a first emission wavelength range and a first peak emission wavelength
Implementation Method 4
a first detector and a second detector, wherein the first detector is capable of detecting emissions within a first detection wavelength range and the second detector is capable of detecting emissions within a second detection wavelength range
Implementation Method 5
the light scattering and fluorescence properties of the particles are measured
Data Source
AI summary
Disclosed herein include methods, compositions, and kits suitable for spectral unmixing and compensation in multi-parameter flow cytometry. Disclosed herein include reagents which comprise two antibodies conjugated to one another to form a bispecific reagent (e.g., a bispecific probe). A first antibody can have affinity for a highly expressed antigen on the surface of a cell of interest and a second antibody can have affinity for each of the antibody-dye conjugates in a multi-parameter panel. There are provided, in some embodiments, methods of using the bispecific reagent to determine spillover, perform compensation, and generate a compensation matrix.