Subcellular Western Blotting Single Cells Microwell Array
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Solution Overview
Problem
Proteomic analysis of rare cell populations, such as circulating tumor cells, is challenging due to low cell concentrations and the obscuring effect of large cell populations, which makes conventional assays like Western blots and flow cytometry unsuitable, and existing methods lack the capability for subcellular fraction analysis of individual cells.
Innovation Solution
A method involving a polymeric separation medium with microwells that covalently bonds cellular components using benzophenone functional groups upon UV exposure, allowing for subcellular fractionation and separation of proteins through differential lysis and electrophoresis, enabling the detection of separated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional Western blot and flow cytometry assays are used, then protein detection can be performed, but the assays require large cell populations (~10^6 cells) and cannot analyze rare cell populations effectively
Solution Approach 1:
The invention divides the cell analysis process into subcellular compartments by using differential lysis buffers that selectively lyse specific organelles (e.g., plasma membrane first, then nuclear membrane), allowing separate analysis of cytosolic and nuclear proteins from the same single cell. This segmentation enables detection of rare cells by analyzing their unique subcellular protein profiles.
Solution Approach 2:
The microwell array provides localized analysis compartments, with each microwell containing a single cell or subcellular fraction. This local quality approach allows individual rare cells to be analyzed in isolation without being obscured by large cell populations, while the array format maintains high throughput capability.
2Measurement precision
If single cell analysis is performed, then rare cell population analysis becomes possible, but subcellular fraction analysis capability is lost in conventional methods
Solution Approach 1:
The invention employs a dynamic, multi-step lysis process where different buffers are applied sequentially to differentially lyse subcellular compartments. First, a plasma membrane-permeable buffer lyses the cytoplasmic membrane, then a nuclear membrane-permeable buffer lyses the nuclear membrane, dynamically releasing proteins from different compartments in sequence for separate electrophoretic analysis.
Solution Approach 2:
The microwell array system serves multiple functions: it captures single cells, performs differential lysis of subcellular compartments, conducts electrophoresis of released proteins, and enables detection of separated components. This multi-functionality allows single cell analysis to maintain subcellular fraction analysis capability that was previously lost.
3Manufacturing precision
If protein separation by electrophoresis is performed, then protein characterization is enabled, but the requirement for large cell populations limits analysis of rare cells
Solution Approach 1:
The invention creates multiple copies of the electrophoresis separation process by using an array of microwells, where each microwell performs independent electrophoresis on proteins from a single cell. This array approach amplifies the signal from rare cells while maintaining the resolution of protein separation, overcoming the limitation of requiring large cell populations.
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
Enables the precise measurement of protein localization and expression in single cells by fractionating subcellular compartments, improving the analysis of rare cell populations and providing detailed insights into cellular behavior.
Implementation Method 1
the polymeric separation medium includes bezophenone functional groups that covalently bond one or more cellular components to the polymeric separation medium upon application of ultraviolet light
Implementation Method 2
applying an electric field to the polymeric separation medium in a manner sufficient to move at least some of the set of cellular components into the polymeric separation medium to produce a set of separated cellular components
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4C
AI summary
Electrophoretic separation methods and systems for performing the same are provided. The methods and systems find use in a variety of different electrophoretic separation applications, such as sub-cellular Western blotting of single cells.