Magnetic Microfluidic Cell Sorting for High-Throughput CRISPR Screens
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Solution Overview
Problem
Current technologies face challenges in efficiently sorting large collections of cells, such as CRISPR-edited cells, to identify rare subpopulations based on phenotypic changes, due to limitations in throughput and cell viability.
Innovation Solution
A microfluidic device with magnetic deflection guides is used to sort magnetically labelled cell samples into subpopulations based on the level of a target marker, employing a fluidic sorting channel with angled deflection guides and a magnetic field to separate cells effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FACS is used for sorting and isolation of antibody-labeled cells, then sorting precision is improved, but throughput is limited and cell viability is reduced
Solution Approach 1:
The patent replaces the optical-mechanical FACS system with a magnetic field-based microfluidic sorting system. Magnetic beads conjugated to antibodies bind to target cells, and magnetic deflection guides use magnetic fields to deflect bound cells into collection channels, eliminating the need for optical detection and mechanical sorting while achieving both high throughput and precision
Solution Approach 2:
The patent introduces magnetic beads as an intermediary between the antibody and the cell. The magnetic beads conjugated to antibodies bind to target markers on cells, allowing magnetic field manipulation of the cells through the beads. This intermediary enables magnetic control of cell sorting without direct optical or mechanical intervention on the cells themselves
2Measurement precision
If FACS is used for sorting and isolation of antibody-labeled cells, then sorting precision is improved, but sorting time is extended leading to reduced cell viability
Solution Approach 1:
The magnetic field-based deflection system processes cells continuously at high speeds without the sequential detection and sorting steps of FACS, reducing sorting time from minutes to seconds while maintaining precision through magnetic bead binding specificity
Solution Approach 2:
The microfluidic system enables continuous flow and continuous sorting of cells through the magnetic deflection guides, eliminating the stop-and-go nature of FACS where cells must be individually detected and then sorted. This continuous action dramatically reduces total sorting time while maintaining high cell viability
3Ease of operation
If traditional sorting instrumentation is used, then sorting capability is achieved, but device complexity and cost are increased
Solution Approach 1:
The patent replaces complex optical systems, lasers, detectors, and mechanical sorting apparatus with a simple magnetic field generation system and passive microfluidic channels, dramatically reducing device complexity while maintaining sorting capability
Solution Approach 2:
The microfluidic chip can be designed as a disposable, low-cost device that integrates the magnetic deflection guides and fluidic channels, eliminating the need for expensive, complex, and maintenance-intensive traditional sorting instrumentation
4Measurement precision
If FACS is used for sorting, then antibody-labeled cells can be isolated, but cellular perturbations are induced affecting metabolic and functional results
Solution Approach 1:
The magnetic field-based sorting system is gentler on cells compared to the high shear forces, electrical fields, and mechanical stress experienced during FACS sorting, reducing cellular perturbations while maintaining isolation accuracy through specific magnetic bead-antibody binding
Solution Approach 2:
The magnetic beads serve as a protective intermediary, allowing the cell to be manipulated indirectly through magnetic fields rather than direct mechanical or electrical forces. This reduces stress on the cell membrane and internal structures, minimizing metabolic and functional perturbations
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 device achieves high-throughput sorting with preserved cell viability, enabling the efficient separation of phenotypically distinct subpopulations, which is particularly beneficial for genome-scale screens.
Implementation Method 1
a magnet positioned underneath the fluidic sorting channel to generate a magnetic field
Implementation Method 2
separating a flowing stream of magnetic nanoparticle-bound tumor cells with differential magnetic loading into 10 streams
Data Source
AI summary
Microfluidic devices, kits systems and methods are provided for high throughput phenotypic separation of magnetically labelled cell samples. The devices and methods can be used for example to sort cells based on level of target marker and to sort screen cells, such as CRISPR screen cells and other screens with a large number of target cells, to isolate target cells and putative genetic modifiers.