Stochastic Barcoding for Cell Identity Tracking
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Solution Overview
Problem
Current methods for tracking cell identity across analytical platforms face challenges in scalability, multiplexing depth, and non-destructive, non-disruptive tracking, especially when transferring cells from microfluidic devices to standardized platforms like microtiter plates, often requiring physical access and limited by deterministic codes and fluorescent labeling.
Innovation Solution
Stochastic barcoding (SB) method using randomly distributed, photopolymerized beads within a hydrogel matrix, where the number, color, and position of beads create a unique stochastic barcode for each cell, enabling high multiplexing depth without physical access, and allowing cells to be tracked across platforms with high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If deterministic codes and fluorescent labeling are used for cell tracking, then cell identity can be tracked, but the method is limited by physical access requirements and limited multiplexing depth
Solution Approach 1:
The patent replaces mechanical/physical access methods with optical detection. Instead of requiring physical manipulation or direct contact with cells for tracking, the system uses fluorescently labeled beads that can be detected optically through the hydrogel matrix, eliminating the need for physical access while enabling high-throughput tracking of thousands of cells simultaneously
Solution Approach 2:
The patent changes the tracking parameter from deterministic codes to stochastic barcodes composed of multiple fluorescent colors and bead positions. This parameter change increases multiplexing depth exponentially, allowing thousands of unique cell identities to be encoded and tracked simultaneously without increasing physical complexity
2Reliability
If fluorescent labeling is used for cell tracking, then cell identity can be maintained, but the method is disruptive and destroys cell integrity
Solution Approach 1:
The patent introduces fluorescently labeled beads as intermediaries that associate with cells during encapsulation but do not directly label or modify the cells themselves. The beads serve as proxies for cell identity, allowing tracking without direct interaction with cellular components, thus maintaining cell integrity while enabling reliable identification
Solution Approach 2:
The patent creates a copy of cell identity information through the stochastic barcode formed by beads present during encapsulation. Rather than directly tagging the cell, the system captures a snapshot of the bead distribution at encapsulation time, creating an indirect copy of cell identity that can be read later without affecting the original cell
3Productivity
If thousands of cells are tracked simultaneously, then productivity increases, but measurement precision decreases due to code collision
Solution Approach 1:
The patent transitions from one-dimensional deterministic codes to a multi-dimensional stochastic barcode system that incorporates bead position (x,y coordinates), bead size, and fluorescent color. This dimensional expansion creates a vastly larger coding space, allowing thousands of unique cell identities to be distinguished simultaneously with high precision, eliminating code collision even at high throughput
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
The stochastic barcoding method achieves accurate tracking of thousands of cells with minimal error, maintaining cell integrity and enabling multiparametric analysis by providing deep coding depth and scalability, allowing for the connection of genotype, phenotype, and function across diverse bioanalytical platforms.
Implementation Method 1
encapsulating a cell in a matrix including a plurality of markers
Implementation Method 2
The polymer beads can include emissive polymer beads
Data Source
AI summary
A method of tracking cell identity across analytical platforms uses stochastic barcoding (SB). SB uses a randomly generated code based on one or more of the number, color and position of beads encapsulated together with a set of cells of interest. SB use is demonstrated in an application where cells are transferred from a microwell array into a microtiter plate while keeping their identity, and obtained an average identification accuracy of 96% for transfer of 100 blocks. Model scaling of the method up to 1000 blocks demonstrated that SB is able to achieve approximately 90% accuracy.