Soybean EF1A Promoter for Constitutive Gene Expression
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Solution Overview
Problem
Current plant genetic engineering lacks effective constitutive promoters that can uniformly express heterologous nucleic acid fragments across various tissues and developmental stages, limiting the simultaneous expression of multiple genes for desirable traits like disease resistance, herbicide resistance, and yield improvement.
Innovation Solution
The use of a recombinant expression construct with a soybean EF1A promoter, which is a constitutive elongation factor promoter capable of driving the expression of heterologous nucleic acid fragments in a tissue-independent manner, ensuring uniform expression across different plant tissues and stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If tissue-specific promoters are used to express heterologous genes, then expression levels are improved in specific tissues, but expression uniformity across different tissues deteriorates
Solution Approach 1:
The patent uses constitutive promoters that function across all plant tissues and developmental stages, making the expression system universal rather than tissue-specific. This allows the same promoter to drive gene expression in roots, shoots, leaves, flowers, and fruits simultaneously, achieving both high expression levels and broad tissue coverage
2Power
If strong constitutive promoters are used to drive high-level expression, then expression strength is improved, but promoter availability and diversity deteriorate
Solution Approach 1:
The patent modifies promoter sequences to optimize their constitutive activity across different plant species and tissues. By adjusting promoter strength parameters and testing in various plant backgrounds, the invention creates a range of constitutive promoters with different expression levels, providing both strength and diversity for different application needs
3Adaptability or versatility
If multiple heterologous genes are introduced for stacking traits, then trait diversity is improved, but expression uniformity across tissues deteriorates
Solution Approach 1:
The patent employs multiple constitutive promoters with similar tissue-independent characteristics to drive expression of different heterologous genes. This universal promoter approach ensures that each gene in the stack is expressed uniformly across all plant tissues, maintaining expression consistency even when multiple traits are combined in a single plant
Data Source
AI summary
The promoter of a soybean translation elongation factor EF1 alpha, a polypeptide that promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis, and fragments thereof and their use in promoting the expression of one or more heterologous nucleic acid fragments in a tissue-independent or constitutive manner in plants are described.