Multi-Cistronic Viral Vector for T Cell Engineering
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Solution Overview
Problem
There is a need for gene delivery systems that are safe and efficient for transgene expression in adoptive cellular therapy, particularly for co-expressing multiple proteins in T cells for cancer immunotherapy.
Innovation Solution
A multi-cistronic cassette vector is used to express multiple proteins in a single vector, including a first dimer and a second dimer, where the dimers are different and co-expressed on the surface of T cells, utilizing a 5' to 3' orientation arrangement and including additional nucleotide sequences for self-cleaving 2A peptides, linker peptides, and furin peptides for enhanced protein processing and expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate vectors are used to express different proteins in T cells, then each protein can be expressed independently, but the complexity of the gene delivery system increases and manufacturing becomes more difficult
Solution Approach 1:
The patent combines multiple cistronic elements (TCRα, TCRβ, CD8α, CD8β) into a single bicistronic or multicistronic viral vector. This merging approach allows simultaneous expression of multiple proteins required for T cell engineering in one delivery event, reducing the complexity of using multiple separate vectors while maintaining reliable transgene expression through internal ribosome entry sites (IRES) or 2A self-cleaving peptides.
Solution Approach 2:
The viral vector is designed with multi-functionality to express multiple therapeutic proteins (TCR chains and CD8 chains) simultaneously. This universal vector can be applied to generate fully engineered T cells with both TCR and CD8 co-expression, eliminating the need for multiple specialized vectors and simplifying the overall gene delivery system.
2Ease of manufacture
If a single vector expresses multiple proteins, then the gene delivery system becomes simpler, but the manufacturing precision and protein processing quality may be compromised
Solution Approach 1:
Within the single vector, the patent segments the multiple protein-coding sequences using distinct transcriptional units separated by IRES elements or 2A peptides. This segmentation allows each protein (TCRα, TCRβ, CD8α, CD8β) to be independently translated and processed, maintaining manufacturing precision for each protein while keeping the overall delivery system simple and unified.
3Adaptability or versatility
If traditional bicistronic vectors are used for TCR expression, then TCR production is achieved, but CD8 co-expression is not accomplished, limiting T cell engineering completeness
Solution Approach 1:
The patent merges TCR expression and CD8 expression into a single multicistronic vector system. By combining four cistronic elements (TCRα, TCRβ, CD8α, CD8β) in one vector, the system achieves complete T cell engineering with both TCR and CD8 co-expression, enhancing adaptability for generating fully engineered T cells with dual functionality.
Data Source
AI summary
A vector containing a first nucleotide sequence S1 encoding a protein Z1, a second nucleotide sequence S2 encoding a protein Z2, a third nucleotide sequence S3 encoding a protein Y1, and a fourth nucleotide sequence S4 encoding a protein Y2, in which Z1 and Z2 form a first dimer and Y1 and Y2 form a second dimer, in which the first dimer Z1Z2 is different from the second dimer Y1Y2.