FRET Reporter Cells for High-Throughput T-Cell Epitope Identification
Solution Overview
Problem
Current methods lack a high-throughput and practical approach for identifying T-cell epitopes, which are crucial for understanding immune-related disorders and developing therapeutic strategies in cancer immunology, infectious diseases, and transplantation medicine, due to the complexity of T-cell antigen recognition and the vast epitope space.
Innovation Solution
A method involving reporter cells that express candidate epitope-encoding nucleic acids and present peptides in the context of MHC proteins, generating a signal upon recognition by cytotoxic lymphocytes, allowing for the identification and isolation of epitope sequences through a FRET-based fluorescent protein signaling system and subsequent analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional methods are used to identify T-cell epitopes, then measurement precision can be maintained, but productivity is extremely low due to the inability to screen the enormous epitope space
Solution Approach 1:
The patent segments the enormous epitope space into manageable libraries of candidate epitope-encoding nucleic acids, allowing systematic screening through division of the total search space into discrete, screenable units
Solution Approach 2:
The patent introduces reporter cells as an intermediary system that translates T-cell recognition events into measurable signals. These reporter cells express candidate epitopes in the context of MHC molecules and generate detectable signals when recognized by cytotoxic T-lymphocytes, enabling high-throughput screening without directly observing T-cell interactions
2Reliability
If the entire epitope space is screened to ensure comprehensive identification, then reliability is improved, but loss of time increases due to the enormous search space
Solution Approach 1:
The patent performs preliminary organization of candidate epitopes into structured nucleic acid libraries before screening, and uses signal generation as a preliminary indicator to identify only those epitopes that are recognized by T-cells, avoiding exhaustive screening of all possible epitopes
Solution Approach 2:
The patent enables continuous screening through high-throughput methods where reporter cells continuously present epitope libraries to T-cells, with signals generated in real-time allowing uninterrupted identification of multiple epitopes without repeated batch processing
3Measurement precision
If highly specific T-cell clonotypes are targeted for identification, then measurement precision is improved, but ease of operation deteriorates due to the low abundance of target cells in the repertoire
Solution Approach 1:
The patent inverts the traditional approach by instead of searching for rare T-cell clonotypes in a sea of other cells, it presents a library of candidate epitopes to the T-cell population and allows the rare specific T-cells to identify themselves through signal generation when they recognize their cognate epitope-MHC complex
Solution Approach 2:
The patent implements feedback through signal generation by reporter cells that provides real-time information about T-cell recognition events. This feedback mechanism allows identification of specific T-cell clonotypes based on their recognition behavior rather than requiring direct detection of the rare cells themselves
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 efficient and high-throughput identification of T-cell epitopes, facilitating applications in cancer immunotherapy, vaccine development, autoimmune disease diagnosis, and organ transplantation by isolating and analyzing epitope sequences recognized by cytotoxic lymphocytes.
Implementation Method 1
the reporter cells may be genetically modified to express a FRET-based fluorescent protein signaling system that generates a fluorescent signal whenever enzymatically cleaved by an effector agent delivered to the reporter cell by a cytotoxic lymphocyte
Data Source
AI summary
The present invention is a method for determining the identity of the epitopes recognized by T-cells. The method consists of expressing an encoded library of candidate epitope sequences in a recipient reporter cell capable of providing a detectable signal upon cytotoxic attack from a single cognate T-cell followed by contacting the reporter cells with T-cells of interest. The reporter cells with a single indicating cytotoxic attack from a T-cell are isolated and then analyzed by next-generation sequencing in order to identify the epitope sequences. Specifically disclosed is a method in which a library of candidate epitope-encoding nucleic acids are expressed in cells which feature a membrane-bound major histocompatibility complex (MHC) protein, said library produced by transfection of plasmids featuring both a nucleotide encoding the candidate epitope and a nucleotide encoding a FRET-based fluorescent protein cleaved by granzyme.