Transcription Unit Design for Recombinant Protein Expression
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Solution Overview
Problem
Current expression vectors for recombinant protein production face challenges such as limited productivity, antigen-specific antibody production, cloning issues, transfection efficiency problems, and potential health risks due to viral promoters.
Innovation Solution
A transcription unit comprising specific regulatory elements like the hCMVie enhancer, cyclin-dependent kinase 9 (CDK9) or β-actin promoter, and 5' untranslated regions (UTRs) from HTLV-1, NF-κB Repressing Factor, and eukaryotic Initiation Factor 4GI genes, designed to enhance protein expression, reduce vector size, and eliminate viral promoters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional expression vectors with viral promoters are used, then protein expression can be achieved, but health risks increase due to potential safety concerns
Solution Approach 1:
The invention extracts and removes the viral promoter elements (CMV, SV40, RSV) from the expression vector system while retaining the essential transcriptional activation functions through alternative non-viral promoter designs and modular regulatory element combinations, thereby eliminating safety concerns while maintaining expression capability
Solution Approach 2:
The invention introduces intermediary regulatory elements such as the 5' UTR regions from HTLV-1, NF-κB Repressing Factor, and eukaryotic Initiation Factor 4GI genes, along with enhancer elements, that mediate transcriptional activation and mRNA stability without relying on viral promoters, thus bridging the gap between safety and expression efficiency
2Productivity
If expression vectors include comprehensive regulatory elements for high protein expression, then productivity increases, but vector size increases causing cloning and transfection efficiency problems
Solution Approach 1:
The invention segments the expression vector into modular functional units including separate enhancer elements, promoter regions, 5' UTR regions, and coding sequences, allowing selective combination of elements to achieve desired expression levels while maintaining compact vector architecture that facilitates cloning and transfection
Solution Approach 2:
The invention optimizes specific local regions of the vector such as the 5' UTR sequences and enhancer elements to maximize transcriptional and translational efficiency at critical positions, rather than uniformly expanding the entire vector, thereby achieving high productivity without proportional increases in overall vector size
Data Source
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AI summary
The present invention concerns new transcription units that can be used in expression vectors. One of the aims of the invention is to provide a transcription unit that can be used to produce antibodies whereof the productivity gain is not linked to an antibody with a specific antigenic target and, therefore, by extrapolation, to a given recombinant protein, or linked to the culture medium.