Nucleic Acid Construct for Stable Cell Line Generation
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Solution Overview
Problem
Current methods for generating genetically stable cell lines for the production of therapeutic and prophylactic biologics face challenges in maintaining genetic stability and preventing the generation of replication-competent adenoviruses during vector production, particularly in primary human cells.
Innovation Solution
A nucleic acid construct comprising expression units for E1A and E1B with optimized 3'UTR and intron sequences, integrated into amniocytic cells to create a permanent, genetically stable cell line that prevents crisis and maintains telomere length, thereby reducing the formation of replication-competent adenoviruses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to generate cell lines for biologic production, then cell lines can be established, but genetic stability is compromised and replication-competent adenoviruses may form
Solution Approach 1:
The invention divides the E1 region into separate expression units for E1A and E1B proteins with independently optimized 3'UTR sequences. This segmentation allows each protein expression to be controlled separately, preventing the formation of complete replication-competent adenoviruses while maintaining necessary functions for cell line generation and biologic production stability.
Solution Approach 2:
The invention modifies the 3'UTR sequences of both E1A and E1B expression units to contain 30 or fewer Exonic Splicing Enhancer (ESE) elements. This parameter change in the molecular structure prevents aberrant splicing events that could lead to replication-competent adenovirus formation, while still enabling stable cell line establishment and genetic consistency during biologic production.
2Productivity
If primary human cells are used for biologic production, then production capacity can be achieved, but genetic instability and crisis development occur
Solution Approach 1:
The invention introduces optimized E1A and E1B expression units with modified 3'UTR sequences into primary human amniocytic cells before establishing the cell line. This preliminary modification prevents crisis development and maintains telomere length, enabling the cells to achieve both high productivity for biologic production and long-term genetic stability without the usual limitations of primary cells.
Data Source
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AI summary
The present invention is related to a nucleic acid construct comprising - an expression unit for the expression of EIB, wherein the expression unit comprises a promoter, a nucleotide sequence coding for EIB, and a 3'UTR, wherein the promoter is operatively linked to the nucleotide sequence coding for EIB, wherein the 3'UTR comprises 30 or less than 30 Exonic Enhancer Elements (ESEs), preferably 20 or less than 20 Exonic Enhancer Elements (ESEs), and wherein the 3' UTR is a non-viral 3' UTR.