Soybean pRPS28 Promoter for Stable Constitutive Gene Expression
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Solution Overview
Problem
Existing soybean promoters, such as the 35S promoter, face issues with transgenic silencing and safety concerns, and constitutive promoters like Gmubi are often stage-specific, leading to challenges in achieving consistent expression of foreign genes across different developmental stages and tissues.
Innovation Solution
The use of the soybean reference genes RPS28 and EIF1, along with their promoters pRPS28 and pEIF1, which are ubiquitously expressed and intron-comprising, to drive the constitutive expression of foreign genes like GUS in soybean, Arabidopsis, and tobacco, through recombinant vectors like pRPS28-GUS-BAR and pEIF1-GUS-BAR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If viral promoters such as 35S or CMV are used for soybean transformation, then foreign gene expression can be achieved, but transgenic silencing and safety problems occur
Solution Approach 1:
The patent changes the fundamental parameter of promoter origin from viral to endogenous plant source. By using the soybean-specific promoter pRPS28 instead of viral promoters like 35S or CMV, the invention maintains high expression levels while eliminating transgenic silencing and safety issues associated with viral promoters.
Solution Approach 2:
The patent applies local quality by using a promoter that is specifically adapted to soybean biology. The pRPS28 promoter is derived from soybean itself and exhibits constitutive expression characteristics specific to soybean tissues, providing optimized local control for foreign gene expression in this crop species.
2Productivity
If constitutive promoters like Gmubi are used, then high expression levels are achieved, but expression is stage-specific and does not maintain consistency across different developmental stages
Solution Approach 1:
The patent changes the temporal expression parameter by using pRPS28, which maintains constitutive expression across all developmental stages from seedling to maturity. Unlike Gmubi which shows stage-specific variation, pRPS28 provides consistent expression levels throughout plant development, including during nodule formation.
Solution Approach 2:
The pRPS28 promoter demonstrates universality by functioning effectively across multiple tissues and developmental stages. It drives expression in roots, leaves, flowers, and developing nodules, making it a versatile tool for soybean genetic engineering that overcomes the stage-specific limitations of other constitutive promoters.
3Adaptability or versatility
If multiple genes are inserted into the genome of a transgenic organism, then genetic diversity is achieved, but transgenic silencing occurs
Solution Approach 1:
The patent changes the promoter origin parameter to endogenous soybean source, which fundamentally alters the interaction dynamics between multiple transgenes. The pRPS28 promoter appears to reduce silencing effects when multiple genes are co-introduced, maintaining stable expression across polygenic transformations.
Data Source
AI summary
A method for promoting expression of a foreign gene in a plant includes: constructing a recombinant vector including a full-length soybean gene promoter pRPS28 or an intron-including soybean gene promoter pRPS28-I, and introducing the recombinant vector into the plant; the full-length promoter pRPS28 being represented by SEQ ID NO: 2, and the intron-including promoter being represented by pRPS28-I SEQ ID NO: 3.