Transposon-Mediated Expression Vector Production for Stable Protein Repertoires
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing protein repertoires and high-throughput screening are laborious and inefficient, particularly in stable expression, leading to unpredictable transcriptional variation and gene silencing due to random integration of transgenes, which hampers the production of proteins of interest like antibodies.
Innovation Solution
A method involving the sorting of single cells expressing proteins of interest, amplification of their nucleic acids, modification into expression cassettes with transposon elements, and batch transfer into host cells for stable genomic integration, enabling high-throughput production and screening while maintaining the sorting and expression cassette arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If molecular cloning is used to clone protein-encoding sequences into host cells, then individual clones can be selected and expressed, but the process becomes laborious and not suitable for high-throughput production
Solution Approach 1:
The patent applies preliminary action by pre-sorting single cells into individual wells before amplification and cloning. This sorting step is performed in advance on the source population, creating an organized array of single cells that can be processed in parallel. The sorting maintains spatial arrangement throughout subsequent steps, enabling high-throughput processing while preserving individual clone identity without requiring laborious sequential manipulation of each clone.
2Duration of action of stationary object
If transgenes are randomly integrated into the host cell genome for stable expression, then long-term expression is achieved, but transcriptional variation and gene silencing occur due to position effects
Solution Approach 1:
The patent applies local quality by selecting specific integration sites in the host cell genome that have favorable transcriptional properties. Rather than allowing random integration throughout the genome, the method targets particular loci known to support consistent and high-level expression. This creates locally optimized integration environments that maintain transcriptional consistency while achieving stable long-term expression, avoiding the position effects that cause silencing and variation.
3Measurement precision
If single cells are sorted and individually processed through molecular cloning, then correct clones can be identified, but the process is too slow for high-throughput screening of large repertoires
Solution Approach 1:
The patent applies segmentation by dividing the source cell population into individual single cells, each assigned to a separate well or location in an array. This segmentation allows parallel processing of many clones simultaneously while maintaining the ability to identify and track individual clones through their spatial position. The segmented arrangement enables high-throughput screening where dozens or hundreds of clones can be processed and identified in parallel rather than sequentially, dramatically increasing throughput while preserving identification accuracy.
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
This approach facilitates rapid and reliable production of protein repertoires with stable expression, reducing transcriptional variation and gene silencing, and allows for efficient identification and isolation of proteins with desired characteristics.
Implementation Method 1
modification into expression cassettes with transposon elements, and batch transfer into host cells for stable genomic integration
Data Source
Figure 1A
Figure 1B~2b
Figure 3
AI summary
The present invention relates inter alia to expression vector production as well as application to the production of host cells for protein repertoire expression and high-throughput screening. The invention also relates to primers useful for PCR amplification of nucleotide sequences encoding human antibody variable domains.