TRAV12-2 Alpha Chain TCR Library Construction
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Solution Overview
Problem
Current methods for constructing T cell receptor (TCR) libraries are inefficient, often resulting in non-functional or non-specific TCRs due to the introduction of non-natural mutations and limited diversity in CDR3 sequences, leading to difficulties in identifying TCRs that specifically bind to disease-associated antigens.
Innovation Solution
A library of particles displaying TCRs comprising an alpha chain with a TRAV12-2 gene product and a beta chain with a TRBV gene product from a natural repertoire, allowing for the expression of TCRs with natural CDR3 sequences and potential non-natural mutations to enhance diversity and stability, facilitating the identification of antigen-specific TCRs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current methods for constructing TCR libraries are used, then library diversity is increased, but the functional reliability of TCRs decreases due to non-natural mutations and limited CDR3 diversity
Solution Approach 1:
The TCR library construction is segmented into distinct components: a fixed TRAV12-2 alpha chain variable domain and a diversified beta chain variable domain from a single TRBV gene. This segmentation allows controlled diversity in the beta chain while maintaining reliability through the consistent, well-characterized TRAV12-2 alpha chain framework, resolving the contradiction between diversity and functional reliability.
Solution Approach 2:
Diversity is locally concentrated in the beta chain variable domain (specifically CDR3 region) while the alpha chain variable domain maintains uniform high quality through the TRAV12-2 gene product. This local quality approach ensures that diversity is introduced only where needed for antigen recognition while maintaining overall TCR structural and functional reliability.
2Adaptability or versatility
If non-natural mutations are introduced to enhance TCR diversity, then library complexity increases, but the specificity and affinity of identified TCRs decrease
Solution Approach 1:
The TRAV12-2 alpha chain variable domain is pre-selected and fixed before library construction, providing a reliable framework that has been previously characterized for proper folding and function. This preliminary action ensures that all TCRs in the library start with a proven functional base, maintaining specificity and affinity while allowing diversity to be introduced only in the beta chain.
3Reliability
If TCR libraries with natural CDR3 sequences are constructed, then the identification of functional TCRs improves, but the library construction complexity increases
Solution Approach 1:
The invention extracts and isolates the TRAV12-2 alpha chain variable domain as a separate, fixed component, and combines it with diversified beta chain variable domains from a single TRBV gene. This extraction approach simplifies library construction by separating the reliable framework (TRAV12-2) from the diversity-generating element (beta chain CDR3), making the overall process more manageable despite maintaining high functional identification rates.
Data Source
AI summary
The present invention relates to a library of particles, the library displaying a plurality of different T cell receptors (TCRs), wherein the plurality of TCRs consists essentially of TCRs comprising an alpha chain variable domain and a beta chain variable domain, wherein the alpha chain variable domain comprises a TRAV12-2 gene product and the beta chain variable domain comprises a TRBV gene product.