Targeted Nucleic Acid Integration for Stable Recombinant Expression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional random integration of nucleotide sequences for producing recombinant proteins in host cells leads to variability in gene expression and cell growth phenotypes, instability, and requires labor-intensive screening to achieve stable expression, with sequence variance and mutagenicity issues.
Innovation Solution
Targeted integration (TI) of exogenous nucleic acids into host cells using supertransfection and recombinase-mediated cassette exchange (RMCE) to introduce multiple sequences of interest into a single locus, ensuring high productivity and controlled expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If random integration of nucleotide sequences is used, then integration occurs in host cell genome, but gene expression and cell growth phenotypes vary due to position effect
Solution Approach 1:
The patent applies preliminary action by pre-engineering specific integration sites (IS) in the host cell genome with defined regulatory elements and chromatin structures before introducing the nucleotide sequence. This pre-prepared environment ensures that subsequent integration events occur at locations optimized for consistent gene expression and stable cell growth, eliminating the position effect variability inherent in random integration approaches.
2Ease of manufacture
If random integration strategy is used, then nucleotide sequence integrates into host genome, but control over number of gene copies is not achieved
Solution Approach 1:
The patent applies local quality by designing specific integration sites with unique molecular recognition features and controlled accessibility properties. These localized characteristics at predetermined genomic positions enable precise control over integration events, ensuring that nucleotide sequences integrate at specific locations with defined copy numbers rather than random distribution throughout the genome.
3Productivity
If gene amplification methods are used to achieve high-producing cells, then expression level increases, but unstable cell growth and product expression occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring integration sites with optimized regulatory elements, chromatin accessibility, and epigenetic markers before integration. This pre-prepared environment enables high-level polypeptide expression from single-copy or low-copy integrated sequences, eliminating the need for gene amplification and the associated cellular instability that arises from excessive DNA replication and maintenance burden.
4Reliability
If screening of thousands of clones is performed to isolate high-expression cell lines, then desirable expression level is achieved, but time and labor are consumed
Solution Approach 1:
The patent applies preliminary action by pre-engineering integration sites with optimized regulatory sequences, chromatin structures, and epigenetic configurations that are known to drive high-level gene expression. By preparing these sites in advance with validated expression-enhancing features, the need for extensive screening of multiple clones is eliminated, as integration at these pre-optimized sites directly yields high-expression cell lines.
5Productivity
If selective agents are used to select for high expression, then polypeptide production increases, but sequence variance and mutagenicity occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring integration sites with optimized regulatory elements and chromatin environments that naturally support high-level polypeptide production without requiring strong selective pressure. This pre-optimization of the genomic context enables sustained high expression through physiological means rather than chemical selection, thereby maintaining sequence fidelity and avoiding mutagenic effects from prolonged exposure to selective agents.
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
Achieves stable and efficient expression of recombinant proteins with reduced variability and labor, enabling rapid isolation of high-producing cell lines.
Implementation Method 1
introducing multiple sequences of interest into a single TI locus in a host cell by recombinase-mediated cassette exchange (RMCE)
Data Source
AI summary
The presently disclosed subject matter relates to targeted integration (TI) host cells suitable for the expression of recombinant proteins wherein those TI host cells have been subjected to supertransfection resulting in the random integration (RI) of exogenous nucleic acids encodes into their genome, as well as methods of producing and using said supertransfected TI host cells.