TCR-epitope Pair Identification via Partitioning and Barcoding
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Solution Overview
Problem
Current methods lack an efficient way to identify and characterize T cell receptors (TCRs) and their specific epitope peptides, which are crucial for immunotherapy and diagnostics, due to limitations in analyzing the vast diversity of TCR specificities and their binding interactions.
Innovation Solution
A method involving partitioning T cells with epitope peptides, attaching partition-specific barcodes to TCR and epitope nucleic acids, and sequencing to identify matching sequences that co-segregate, determining the probability of specific binding interactions, and confirming through techniques like ELISA or mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to analyze TCR diversity and binding interactions, then the complexity of the system is maintained, but the ability to identify specific TCR-epitope pairs is insufficient
Solution Approach 1:
The patent segments the complex TCR-epitope interaction analysis into distinct functional modules: (1) T cell partitioning into separate reaction chambers, (2) independent epitope peptide incubation, (3) separate barcode attachment steps for TCR and epitope nucleic acids, and (4) sequential washing and detection phases. This modular segmentation enables precise identification of specific binding pairs while managing system complexity through organized, stepwise processing
Solution Approach 2:
The patent introduces barcodes as intermediary elements that mediate between the TCR-epitope binding event and the detection system. Barcodes are attached to both TCR and epitope nucleic acids, serving as detectable intermediaries that enable high-throughput sequencing identification of specific binding pairs without directly observing the protein-protein interaction. This intermediary approach significantly enhances measurement precision while maintaining manageable system complexity
2Productivity
If high-throughput sequencing is implemented to identify TCR-epitope pairs, then the productivity of identification increases, but the loss of information during processing may increase
Solution Approach 1:
The patent performs preliminary actions by attaching barcodes to TCR and epitope nucleic acids before the high-throughput sequencing process. This preliminary barcoding ensures that identity information is encoded on the nucleic acids themselves, making the information resistant to loss during subsequent pooling, amplification, and sequencing steps. The barcode attachment is completed in advance, so even if some nucleic acid degradation occurs during high-throughput processing, the barcode information remains intact for identification
Solution Approach 2:
The patent creates copies of identity information by attaching barcodes that represent the TCR and epitope sequences. Instead of directly sequencing and analyzing the complex TCR and epitope nucleic acids (which may be lost or degraded), the system creates simplified barcode copies that can be easily tracked through high-throughput processing. These barcode copies serve as information surrogates that preserve the essential identification data through the productive but potentially information-lossy sequencing process
3Measurement precision
If partitioning and barcoding methods are used to identify specific bindings, then the measurement precision improves, but the device complexity and operational complexity increase
Solution Approach 1:
The patent applies preliminary anti-action by implementing rigorous washing steps that remove non-specifically bound epitope peptides and nucleic acids before barcode attachment and sequencing. These preliminary purification actions prevent false positive binding signals that would compromise measurement precision. The washing steps are built into the protocol beforehand, so operators don't need to perform additional complex purification operations, maintaining ease of operation while ensuring high measurement precision through pre-emptive removal of interfering substances
Data Source
AI summary
Methods, compositions, and reaction mixtures are provided for identifying a T cell receptor (TCR) and an epitope peptide that specifically binds the TCR. Methods, compositions, and reaction mixtures are also provided for identifying a plurality of T cell receptors and corresponding epitope peptides that specifically bind the T cell receptors. In some cases, the plurality of T cell receptors and corresponding epitope peptides can be identified in a highly parallel manner.