Microfluidic Droplet Encapsulation for Natively-Paired Antibody Mining
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Solution Overview
Problem
Current methods for mining the antibody repertoire from human donors lack high-throughput technology to rapidly isolate natively-paired antibody sequences, leading to under-sampling of the vast B-cell diversity and limitations in functional analysis and screening.
Innovation Solution
The method involves encapsulating single B-cells in microfluidic droplets with RT-PCR reagents to amplify and link native pairings of heavy and light chain variable domain amplicons, generating expression-ready scFv amplicons that can be screened for binding and function, enabling high-throughput identification of antigen-specific antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If next-generation sequencing technologies are used to sequence V H and V L domains from encapsulated cells, then phylogenetic analysis can be performed, but information about antigen specificity and biological function is lost
Solution Approach 1:
The method separates the sequencing analysis (for phylogenetic information) from the functional screening analysis (for antigen specificity), allowing both types of information to be obtained independently through different technological approaches applied to the same natively-paired library
Solution Approach 2:
The natively-paired scFv library serves as an intermediary that bridges sequencing data and functional information, enabling translation of sequence data into functionally characterized antibody candidates without losing antigen specificity information
2Reliability
If gene synthesis, cloning and expression are used to validate antibody leads, then functional screening can be performed, but throughput is severely bottlenecked
Solution Approach 1:
The method performs preliminary amplification and pairing of antibody sequences within droplets before functional screening, so that when candidates are screened, they are already in a ready-to-express format, eliminating the need for time-consuming gene synthesis and cloning steps
Solution Approach 2:
The method creates multiple copies of the same antibody sequence within each droplet through PCR amplification, generating sufficient material for functional screening without requiring individual cloning and expression of each unique sequence
3Reliability
If single-cell encapsulation methods are used to maintain native pairing, then antigen specificity information is preserved, but throughput is limited to a few thousands of cells at a time
Solution Approach 1:
The method uses microfluidic pressure-driven flow to encapsulate cells at high throughput, utilizing hydraulic pressure to control droplet formation and cell distribution, enabling processing of millions of cells rather than just thousands
Solution Approach 2:
The method optimizes droplet size parameters and cell concentration parameters to achieve both high encapsulation efficiency and high throughput, adjusting these physical parameters to scale from processing thousands to millions of cells while maintaining native pairing
4Productivity
If combinatorial libraries are used for deep mining and clonal stability, then screening capability is enhanced, but antibody potency and manufacturing properties deteriorate
Solution Approach 1:
The method allows the natural B-cell repertoire to serve itself by maintaining native pairings that have already been optimized by the immune system, rather than requiring re-optimization through combinatorial library construction, thus preserving potency while enabling deep screening
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 allows for the rapid isolation and screening of antigen-specific antibodies, preserving native chain pairing and significantly increasing the throughput of antibody discovery, enabling the identification of rare leads that may be missed by existing technologies.
Implementation Method 1
The method involves encapsulating single B-cells in microfluidic droplets with RT-PCR reagents
Implementation Method 2
encapsulating single B-cells in microfluidic droplets with RT-PCR reagents to amplify
Implementation Method 3
amplify and link native pairings of heavy and light chain variable domain amplicons
Data Source
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Figure 2A~2C
Figure 3A~3C
AI summary
The present invention provides a method for producing encapsulated natively-paired scFv amplicons, by encapsulating single cells in droplets, wherein the droplets further contain reagents for amplifying and Sinking native pairings of heavy and light chain variable domain amplicons from single encapsulated cells; lysing the single encapsulated ceils: and generating the encapsulated natively-paired scFv amplicons, wherein each scFv ampiicon comprises a native pairing of heavy and light chain variable domain amplicons.