Engineered Transgene Integration Platform for Precise Gene Targeting
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Solution Overview
Problem
Current plant transformation methods are inefficient and unpredictable, leading to labor-intensive and costly processes for generating transgenic plant lines with desirable traits, as they involve random integration of exogenous DNA into plant genomes, making it difficult to predict gene expression and potential unintended genome disruptions.
Innovation Solution
The development of an Engineered Transgene Integration Platform (ETIP) that allows for targeted integration of donor nucleic acid molecules into specific locations in plant genomes using site-specific nucleases like zinc finger nucleases, enabling precise modification and expression of genes of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional random transformation methods are used, then transgenic plant lines can be generated, but the process is labor-intensive, time-consuming, and unpredictable due to random integration locations
Solution Approach 1:
The patent applies preliminary action by pre-integrating an Engineered Transgene Integration Platform (ETIP) into the plant genome before the actual gene transformation step. This ETIP contains predetermined integration sites with specific sequences that facilitate subsequent targeted integration. By preparing the genomic landscape in advance with these engineered platforms, the system enables rapid and specific integration of transgenes without requiring extensive screening of random integration events, thus dramatically reducing the time and labor needed to obtain transgenic lines with desirable traits
2Adaptability or versatility
If random integration is used, then transgenes can be introduced into the genome, but genomic position effects cause variable gene expression levels making comparison of different transgene designs difficult
Solution Approach 1:
The patent applies local quality by creating specific, engineered integration sites within the ETIP that have predetermined genomic contexts optimized for consistent gene expression. These sites include specific promoter elements, enhancers, and chromatin environment features that are deliberately designed to provide uniform expression levels. By localizing the integration to these carefully constructed sites with specific qualities, the system eliminates the variability caused by random integration into different genomic regions with different expression potentials
3Reliability
If hundreds of transformation events are generated to find desirable transgenic lines, then candidate lines can be identified, but the process becomes extremely labor and cost-intensive with low probability of success
Solution Approach 1:
The patent applies the intermediary principle by introducing the ETIP as a mediating structure between the transgene construct and the plant genome. This ETIP serves as a predetermined platform with specific recognition sequences and integration signals that facilitate direct, targeted integration of transgenes. The intermediary ETIP eliminates the need for extensive screening by ensuring that integration occurs at pre-selected, favorable locations, thereby dramatically increasing the probability of obtaining desirable transgenic lines while reducing the number of events that need to be generated and screened
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 selection and detection of targeted genes, reduces the number of transgenic events needed, and ensures stable, heritable genetic modifications, thereby improving the efficiency and predictability of plant trait engineering.
Implementation Method 1
targeted cleavage of genomic DNA have been described. Such targeted cleavage events can be used, for example, to induce targeted mutagenesis or targeted deletions of cellular DNA sequences, or facilitate targeted recombination at a predetermined chromosomal locus
Data Source
AI summary
An Engineered Transgene Integration Platform (ETIP) is described that can be inserted randomly or at targeted locations in plant genomes to facilitate rapid selection and detection of a GOI that is perfectly targeted (both the 5′ and 3′ ends) at the ETIP genomic location. One element in the subject disclosure is the introduction of specific double stranded breaks within the ETIP. In some embodiments, an ETIP is described using zinc finger nuclease binding sites, but may utilize other targeting technologies such as meganucleases, CRISPRs, TALs, or leucine zippers. Also described are compositions of, and methods for producing, transgenic plants wherein the donor or payload DNA expresses one or more products of an exogenous nucleic acid sequence (e.g. protein or RNA) that has been stably-integrated into an ETIP in a plant cell. In embodiments, the ETIP facilitates testing of gene candidates and plant expression vectors from ideation through Development phases.