Novel Genetic Regulatory Elements for Stable Transgene Expression
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Solution Overview
Problem
The challenge in transgenic crop plants is the activation of gene silencing mechanisms when multiple transgenes are stacked, particularly when using the same genetic regulatory elements, leading to unstable expression of transgenes, especially when new transgenes are introduced or plants are crossed.
Innovation Solution
The development of polynucleotides comprising novel genetic regulatory elements such as promoters and expression-enhancing introns, which can be used to control the expression of genes in transgenic cells and organisms, including plants, by providing alternative sequences that can be operably linked to a gene of interest to enhance or regulate expression without triggering gene silencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same genetic regulatory elements (e.g., CaMV 35S promoter) are used in multiple stacked transgenes, then coordinated expression of multiple transgenes is achieved, but gene silencing mechanisms are activated leading to unstable expression
Solution Approach 1:
The patent segments the genetic regulatory elements into multiple distinct variants. Instead of using a single promoter sequence for all transgenes, the invention employs different promoter sequences (e.g., CaMV 35S promoter variants, other plant promoters) for different transgenes within the same plant. This segmentation allows each transgene to be controlled by its own unique regulatory element, preventing the activation of gene silencing mechanisms while maintaining coordinated expression through careful selection and combination of compatible promoters.
2Adaptability or versatility
If multiple transgenes are stacked into a single transgenic plant, then multiple traits are achieved, but gene silencing is triggered de novo when new transgenes are added
Solution Approach 1:
The patent applies parameter changes by modifying the genetic regulatory element sequences themselves. Different promoter sequences with varying strength, tissue-specificity, and induction characteristics are selected and combined when stacking multiple transgenes. This parameter diversification of regulatory elements prevents the recognition of repeated sequences by silencing mechanisms, allowing stable co-expression of multiple transgenes with different traits in the same plant.
3Productivity
If the CaMV 35S promoter is used to drive high-level constitutive expression of multiple transgenes, then expression level is improved, but gene silencing is promoted
Solution Approach 1:
The patent applies local quality by tailoring the choice of promoter to each specific transgene and its intended function. Rather than uniformly using CaMV 35S for all transgenes, the invention selects promoters with appropriate expression levels and patterns for each gene's purpose. Some transgenes may use strong constitutive promoters like CaMV 35S variants, while others use tissue-specific or inducible promoters, optimizing both expression level and stability for each local context within the plant.
Data Source
AI summary
Polynucleotides comprising genetic regulatory elements, as well as constructs, host cells, and transgenic organisms comprising the same are described. The polynucleotides can control the expression of an operably linked gene in a host cell or organism, such as a plant cell or a plant. Methods of using the polynucleotide to control the expression of an operably linked gene of interest in a plant or plant cell are further provided.