AAD-12 Soybean Event Targeted Integration for Expression Consistency
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Solution Overview
Problem
The challenge in plant breeding is achieving consistent and reliable expression of transgenes in soybeans due to unpredictable integration sites and variable expression levels, leading to the need for extensive screening of numerous events to identify those with desired herbicide tolerance and agronomic performance.
Innovation Solution
The development of the AAD-12 soybean event pDAB4472-1606, which includes a specific insertion of the aad-12 polynucleotide sequence into a defined site in the soybean genome, providing herbicide tolerance and allowing for targeted integration of additional traits through homologous recombination, and the use of event-specific assays for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random integration of transgenes is used, then transformation efficiency is improved, but expression consistency deteriorates
Solution Approach 1:
The patent applies local quality by targeting specific chromosomal regions with defined characteristics (such as heterochromatin or euchromatin regions) for transgene integration. Instead of random integration, the method selects locations with specific local properties that promote consistent expression, thereby resolving the contradiction between transformation efficiency and expression consistency.
Solution Approach 2:
The patent employs preliminary action by pre-characterizing chromosomal regions before transgene insertion. The method involves identifying and selecting chromosomal locations with specific features (such as nearby transcriptional regulation elements or chromatin structure) that are likely to produce consistent expression, thus avoiding trial-and-error approaches.
2Reliability
If multiple events are screened to find desired expression levels, then expression reliability is improved, but screening complexity increases
Solution Approach 1:
The patent uses preliminary action by pre-identifying chromosomal regions with favorable characteristics for gene expression before performing transformation. This allows the selection of integration sites that are predicted to produce reliable expression, thereby reducing the need to screen multiple events and simplifying the overall screening process.
Solution Approach 2:
The patent introduces intermediary markers or indicators that can predict expression reliability without requiring full phenotypic screening. These intermediaries (such as chromatin structure features or proximity to enhancers) serve as proxies to select appropriate integration sites, reducing the complexity of comprehensive screening while maintaining expression reliability.
3Adaptability or versatility
If transgene insertion sites are not controlled, then transformation flexibility is improved, but expression variability increases
Solution Approach 1:
The patent applies local quality by selecting chromosomal regions with specific local properties (such as open chromatin structure, presence of transcriptional regulation elements, or specific histone modifications) as preferred insertion sites. This approach maintains transformation flexibility while ensuring consistent expression by leveraging the local characteristics of target regions.
Solution Approach 2:
The patent employs parameter changes by modifying the chromosomal context at insertion sites through various means (such as chromatin modification or selection of specific genomic loci). By changing parameters related to chromatin structure or genomic location, the method achieves both flexible transformation and precise, consistent gene expression.
Data Source
AI summary
This invention relates to soybean event pDAB4472-1606 (Event 1606). This invention includes a novel aad-12 transformation event in soybean plants comprising a polynucleotide sequence, as described herein, inserted into a specific site within the genome of a soybean cell. This invention also relates in part to plant breeding and herbicide tolerant plants. In some embodiments, said event/polynucleotide sequence can be “stacked” with other traits, including, for example, other herbicide tolerance gene(s) and/or insect-inhibitory proteins.