Maize Transgene Construct Using Weak Promoters for Stable Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods struggle to achieve significant and consistent increases in grain yield in maize plants through transgenic means, with factors such as promoter elements, genomic location, copy number, and environmental conditions impacting transgene performance.
Innovation Solution
A maize plant transformed with a recombinant polynucleotide sequence encoding a polypeptide, operably linked to a weak heterologous constitutive regulatory element, such as a maize GOS2 promoter, exhibits increased grain yield, with maize seeds showing improvements up to about 8 bu/acre compared to controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transgene is introduced to increase grain yield in maize plants, then grain yield may be improved, but transgene performance is impacted by promoter elements, genomic location, copy number, and environmental factors resulting in inconsistent yield increases
Solution Approach 1:
The patent applies parameter changes by systematically optimizing multiple transgene parameters including promoter strength (using strong constitutive promoters like ubiquitin-1), genomic insertion location (targeting specific chromosomal regions), copy number (achieving single or low copy integrations), and gene sequence (using optimized coding sequences). This multi-parameter optimization approach resolves the contradiction by creating transgenic maize lines that consistently achieve significant grain yield increases (3-8 bu/acre) across varying environmental conditions, transforming unreliable transgene performance into dependable productivity improvement
2Reliability
If multiple factors (promoter elements, genomic location, copy number) are optimized to achieve consistent transgene performance, then reliability of transgene expression is improved, but the complexity of development and characterization increases
Solution Approach 1:
The patent employs preliminary action by pre-designing and pre-characterizing standardized expression constructs containing optimized promoter-coding sequence-terminator arrangements before transformation. The construct development, including selection of strong constitutive promoters and optimization of coding sequences, is completed in advance, allowing systematic evaluation of multiple transformants. This preliminary preparation reduces the complexity of subsequent development by providing a standardized platform for achieving reliable transgene expression without requiring de novo optimization for each transformation event
3Productivity
If extensive testing and characterization of transformation events are conducted to identify constructs that result in increased grain yield, then productivity is improved, but the time and resources required for developmental effort increase substantially
Solution Approach 1:
The patent implements feedback mechanisms through systematic field testing and phenotypic characterization of multiple transformation events. Grain yield, plant height, and other agronomic parameters are measured and compared against non-transformed controls across multiple environments. This feedback loop identifies the most promising transgenic lines (those showing consistent 3-8 bu/acre yield increases) for advancement, while eliminating less effective events. The feedback-driven selection process efficiently directs developmental resources toward constructs that deliver proven productivity benefits, reducing overall development time despite extensive testing
Data Source
AI summary
The compositions and methods disclosed relate to DNA compositions, plant cells, seeds, plant parts that relate to maize plants with increased grain yield trait. Also provided are assays for detecting the presence of the maize DP-202216-6 event based on the DNA sequence of the recombinant construct inserted into the maize genome and the DNA sequences flanking the insertion site. Kits and conditions useful in conducting the assays are provided.