Optimal Maize Genomic Loci for Targeted Transgene Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current maize transformation methodologies rely on random insertion of transgenes, leading to unintended disruption of endogenous traits, gene silencing, and increased costs due to the need for extensive effort to identify functional transgenic events, hindering the effectiveness and efficiency of transgenic maize production.
Innovation Solution
Identification and characterization of optimal nongenic maize genomic loci for targeted transgene integration using site-specific nucleases, such as zinc finger nucleases, CRISPR/Cas, and TALENs, to facilitate precise insertion of exogenous sequences into hypomethylated, non-repetitive regions proximal to genic regions, reducing positional effects and improving transgene expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If random insertion of transgenes is used, then transformation simplicity is maintained, but transgene integration precision deteriorates causing positional effects and gene disruption
Solution Approach 1:
The patent applies preliminary action by pre-identifying and characterizing optimal nongenic maize genomic loci before transgene insertion. These pre-selected loci are characterized by being hypomethylated, non-repetitive, and proximal to genic regions, ensuring they are suitable for targeted integration. This preliminary preparation eliminates the need for random insertion and subsequent screening, directly resolving the contradiction between transformation simplicity and integration precision.
2Quantity of substance
If random insertion is used, then transformation cost is reduced initially, but subsequent screening costs increase due to need to identify functional events
Solution Approach 1:
The patent extracts and removes the problematic random insertion step from the transformation process. By directly targeting pre-identified optimal loci, the method eliminates the need for extensive subsequent screening to identify functional transgenic events. This extraction of the random insertion mechanism resolves the contradiction by ensuring all transformations occur at suitable locations from the start, eliminating wasted screening efforts.
3Manufacturing precision
If targeted integration at pre-selected loci is implemented, then transgene integration precision is improved, but transformation complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the natural characteristics of the pre-selected optimal loci themselves to facilitate integration. The loci are chosen to be hypomethylated and non-repetitive, which makes them inherently more receptive to targeted integration while minimizing complications. The method leverages these inherent properties rather than requiring complex external intervention systems, thus achieving high precision without proportionally increasing transformation complexity.
4Ease of operation
If transgenes are inserted randomly, then initial transformation is simpler, but transgene expression reliability deteriorates due to gene silencing and positional effects
Solution Approach 1:
The patent applies preliminary action by pre-identifying and characterizing optimal nongenic maize genomic loci before transgene insertion. These pre-selected loci are characterized by being hypomethylated, non-repetitive, and proximal to genic regions, ensuring they are suitable for targeted integration. This preliminary preparation eliminates the need for random insertion and subsequent screening, directly resolving the contradiction between transformation simplicity and integration precision.
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 enhances the quality and efficiency of transgenic events by ensuring targeted integration, reducing costs, and supporting transgene expression and breeding applications, thereby improving the production of transgenic maize products.
Implementation Method 1
Significant advances have been made in the last few years towards development of methods and compositions to target and cleave genomic DNA by site specific nucleases (e.g., Zinc Finger Nucleases (ZFNs), Meganucleases, Transcription Activator-Like Effector Nucleases (TALENS) and Clustered Regularly Interspaced Short Palindromic Repeats/CRISPR-associated nuclease (CRISPR/Cas))
Data Source
AI summary
As disclosed herein, optimal native genomic loci from maize plants have been identified that represent best sites for targeted insertion of exogenous sequences.