Barcoded MHC Tetramer Nanoparticles for T Cell Screening
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Solution Overview
Problem
Current methods for identifying and isolating neoantigen-specific T cells are laborious, non-quantitative, and have limited sensitivity, making it challenging to pair neoantigens with their cognate T cell receptors, which is crucial for cancer immunotherapy.
Innovation Solution
A nanoparticle sorting agent with a polynucleotide detection tag and a peptide-loaded streptavidin MHC tetramer is used to create a library of antigen complexes, allowing for the isolation and identification of neoantigen-specific T cells through a microfluidic device and decoding polynucleotides, enabling high-fidelity and rapid identification of patient-specific T cell populations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to identify and isolate neoantigen-specific T cells, then the process can be completed, but it is laborious, non-quantitative, and has limited sensitivity
Solution Approach 1:
The invention segments the identification process by assigning unique barcodes to individual antigen-MHC complexes, allowing parallel screening of multiple antigens simultaneously. This segmentation enables quantitative measurement of T cell responses to each specific antigen, dramatically improving sensitivity while reducing manual labor through automated detection of barcode patterns.
Solution Approach 2:
The invention replaces manual, mechanical sorting and identification methods with a molecular barcode system that can be detected through automated sequencing or imaging technologies. This substitution transforms a labor-intensive mechanical process into an automated molecular detection process, significantly improving both sensitivity and productivity.
2Adaptability or versatility
If multiple candidate neoantigens are screened to find those promoting T cell infiltration, then comprehensive identification is achieved, but the process becomes extremely laborious and time-consuming
Solution Approach 1:
The invention merges multiple antigen screening assays into a single multiplexed experiment by combining barcoded antigen-MHC complexes for multiple candidate neoantigens in one well. T cells are exposed to all antigens simultaneously, and barcode detection reveals which specific antigens elicited T cell responses, reducing screening time from weeks to days while maintaining comprehensive coverage.
Solution Approach 2:
The barcode system serves multiple functions simultaneously: it identifies the specific antigen, quantifies the T cell response magnitude, and enables high-throughput screening of numerous candidates. This multi-functionality allows the system to handle diverse antigen screening needs with a single unified approach, dramatically improving efficiency.
3Measurement precision
If low abundance neoantigen-specific T cell populations are targeted for isolation, then specific T cell populations can be identified, but the difficulty of isolation and identification increases significantly
Solution Approach 1:
The invention introduces barcoded antigen-MHC complexes as intermediaries that bind specifically to cognate T cell receptors. Even rare T cells (as low as 1 in 10,000) are captured by their specific barcode-labeled antigen complexes, allowing physical separation and identification through the barcode tag. This intermediary approach transforms an impossible direct detection task into a feasible affinity-based capture and molecular identification process.
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 method enables the efficient isolation and identification of neoantigen-specific T cells, facilitating their use in cancer immunotherapy by providing a rapid, non-destructive, and high-fidelity approach to screen multiple antigen-MHC pairings, significantly improving the sensitivity and specificity over existing methods.
Implementation Method 1
The nanoparticle sorting agent is linked to the peptide-loaded streptavidin MHC tetramer by hybridization of the first polynucleotide hybridization domain to the second polynucleotide hybridization domain
Data Source
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AI summary
Compositions and methods for isolating patient -derived antigen-specific T cells include an antigen complex having a polynucleotide barcoded nanoparticle sorting agent complexed with a peptide-loaded streptavidin major histocompatability complex (MHC) tetramer, the barcoding technology allowing for high fidelity screening of a library of the antigen complexes to readily isolate and identify antigen-specific T cells.