Barcoded Bead Detection for Intracellular Targets
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Solution Overview
Problem
Current methods for detecting cellular targets, such as flow cytometry, are limited in sensitivity and accuracy, especially during disease states, and fail to provide comprehensive characterization of intracellular distributions and phenotypic plasticity in cell populations.
Innovation Solution
The use of ligand-polymer conjugates with amplification handles, barcodes, and unique molecular identifiers in hybridization buffers and fixation buffers to enable high-throughput detection and characterization of targets within cells, allowing for simultaneous detection of extracellular protein markers and single-cell transcriptomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow cytometry is used for target detection, then simultaneous detection of several biomarkers in a single cell is achieved, but sensitivity and accuracy are limited especially during disease states
Solution Approach 1:
The patent introduces an intermediary system consisting of barcoded beads that mediate between the target analytes and the detection system. Each bead carries multiple copies of a specific ligand conjugated to a unique barcode, serving as a signal amplifier that bridges the gap between low-abundance targets and the detection threshold, thereby enhancing sensitivity without requiring complex instrument modification
Solution Approach 2:
The patent replaces the mechanical/optical detection system of flow cytometry with a biochemical amplification system. Instead of relying on physical light scattering and fluorescence detection limits, the invention uses enzymatic amplification and barcode-based identification to achieve higher sensitivity, substituting mechanical detection constraints with biochemical signal multiplication
2Loss of information
If flow cytometry is used for cell population analysis, then extracellular protein markers are detected, but information regarding intracellular distributions is not provided
Solution Approach 1:
The patent creates a universal detection platform where the same barcoded bead technology can detect both extracellular protein markers (via surface ligands) and intracellular targets (via permeabilization and intracellular ligands). The system functions as both a flow cytometry alternative and a transcription profiling method, providing multi-functional capability that simultaneously captures extracellular and intracellular information without requiring separate detection systems
Solution Approach 2:
The patent applies preliminary action by performing cell permeabilization and intracellular target exposure before the detection step. By pre-treating cells to make intracellular compartments accessible and pre-conjugating ligands to barcoded beads, the system prepares the detection environment in advance, enabling simultaneous access to both extracellular and intracellular targets without requiring complex real-time switching during detection
3Measurement precision
If current methods are used for cell characterization, then extracellular protein markers are detected, but comprehensive characterization of subsets of cells within diseased populations is not achieved
Solution Approach 1:
The patent introduces barcoded beads as intermediaries that carry ligands specific to rare or low-abundance targets. These beads act as signal amplifiers that can detect cell surface markers even when the target cells represent a small fraction of the population, enabling accurate characterization of rare cell subsets within diseased populations by mediating between low-abundance targets and detection thresholds
Solution Approach 2:
The patent replaces the limitation of detecting only cell surface markers with a biochemical amplification system that can detect both extracellular and intracellular targets. By substituting the constraint of marker accessibility with enzymatic and barcode-based amplification, the system achieves comprehensive cell characterization that transcends the availability of cell surface markers alone
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 sensitivity and accuracy of target detection, enabling more detailed characterization of cell subsets and intracellular distributions, particularly in diseased populations, and is scalable with the availability of specific ligands.
Implementation Method 1
a first ligand that binds specifically to a first target
Implementation Method 2
hybridization buffer compositions
Data Source
AI summary
The disclosure relates in part to methods and compositions for detecting targets in a sample. Such methods and compositions can be useful for laboratory, research, and diagnostic purposes.