Eukaryotic Library Generation via Transposon Landing Pads
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Solution Overview
Problem
Existing methods for producing libraries of eukaryotic cell clones with diverse repertoires of binders lack a systematic approach for identifying suitable loci in the genome for uniform integration and transcription of binder sequences.
Innovation Solution
A method involving the use of a landing pad sequence, which is randomly integrated into the genome via transposon-mediated integration, allowing for the identification of suitable loci for binder sequence insertion. This method includes screening for single-copy integration and using site-specific nucleases to create specific integration sites for donor DNA encoding binders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If site-specific nucleases are used to cleave recognition sequences in cellular DNA, then integration sites are created for donor DNA, but the method lacks extensive lists of suitable recognition sequences or loci
Solution Approach 1:
The patent applies preliminary action by first randomly integrating landing pad sequences into the genome via transposon-mediated integration, then screening for single-copy integrations, and finally using site-specific nucleases to cleave recognition sequences at these pre-established loci. This sequential approach prepares the system in advance, creating reliable integration sites before introducing the full library of donor DNA, thereby ensuring uniform integration while managing method complexity through staged preparation
2Adaptability or versatility
If random integration of landing pad sequences is performed via transposon-mediated integration, then suitable loci can be identified, but integration location cannot be controlled
Solution Approach 1:
The patent uses preliminary action by first performing random transposon-mediated integration of landing pad sequences to explore and identify suitable genomic loci, then screening these random integrations to select appropriate single-copy integration sites. This preliminary exploration phase allows the method to adapt to different genomic contexts while establishing precise integration locations before the main library construction, thereby achieving both flexibility in locus identification and precision in final integration locations
Solution Approach 2:
The patent employs landing pad sequences as intermediaries that facilitate the transition from random transposon integration to precise site-specific integration. These landing pads serve as mediator elements that are first randomly integrated, then used as targets for site-specific nuclease cleavage, ultimately enabling controlled donor DNA integration at precisely defined locations while maintaining the flexibility to identify suitable loci through the random screening phase
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 enables the efficient generation of libraries with uniform integration and transcription of binders, increasing the diversity and consistency of the binder repertoire, and facilitating the identification of binders with desired properties.
Implementation Method 1
providing a site-specific nuclease within the cells, wherein the nuclease cleaves the recognition sequence comprised in the landing pad
Implementation Method 2
randomly integrating the landing pad sequence into the genome of the eukaryotic cell via transposon-mediated integration
Data Source
AI summary
Described herein is a method for identifying a locus in a genome of a eukaryotic cell, said locus being a candidate for insertion of binder sequences. Described herein as well is a method of producing a library of eukaryotic cell clones containing DNA encoding a diverse repertoire of binders.