Root-Preferred Promoter Sb-TIP2-3 for Tissue-Specific Gene Expression
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Solution Overview
Problem
The regulation of gene expression in plant roots has not been adequately studied due to a lack of readily available root-specific biochemical functions, limiting the genetic manipulation of plants to achieve desired traits, as there is a need for tissue-preferred promoters to express heterologous gene sequences in specific plant tissues.
Innovation Solution
The development of novel nucleotide sequences for root-preferred promoters, such as the Sb-TIP2-3 promoter, which initiates transcription in the meristematic and mature regions outside the vasculature of plant roots, allowing for the expression of heterologous gene sequences in a tissue-specific manner, including genes conferring herbicide resistance, pathogen resistance, and stress tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If constitutive promoters are used for continuous gene expression throughout plant cells, then gene expression is maintained continuously, but tissue-specific expression control is lost
Solution Approach 1:
The patent applies local quality by using root-preferred promoters that drive gene expression specifically in root tissues rather than throughout the entire plant. This allows continuous expression within the root system while maintaining tissue-specific control, resolving the contradiction between continuous expression and tissue-specificity.
2Adaptability or versatility
If tissue-preferred promoters are used to express genes in specific tissues, then spatial control of gene expression is achieved, but availability of root-specific promoters is limited
Solution Approach 1:
The patent identifies and characterizes root-specific biochemical functions (such as TIP2-3 proton-translocating pyrophosphatase) that are naturally expressed in root tissues. By using the endogenous promoters that drive these self-service root functions, the patent makes root-specific gene expression accessible without requiring external development of new promoter sequences.
3Reliability
If heterologous gene sequences are introduced to confer desirable traits, then plant phenotype is improved, but expression control in specific tissues is challenging
Solution Approach 1:
The patent combines heterologous gene sequences encoding desirable traits (such as pathogen resistance or stress tolerance) with root-preferred promoters. This ensures that the trait-expressing genes are specifically activated in root tissues where they are most needed, achieving both reliable trait expression and precise spatial control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the controlled expression of heterologous gene sequences in plant roots, modifying plant phenotypes by modulating the production of endogenous or exogenous products, thereby conferring desirable traits like herbicide resistance, pathogen resistance, and stress tolerance, through the use of expression cassettes and transformed plant cells, tissues, and seeds.
Implementation Method 1
nucleotide sequences for promoters that initiate transcription
Data Source
AI summary
The present disclosure provides compositions and methods for regulating expression of heterologous gene sequences in a plant. Compositions include a novel nucleotide sequence for a promoter for the gene encoding Sorghum bicolor TIP2-3. A method for expressing a heterologous gene sequence in a plant using the promoter sequences disclosed herein is provided. The method comprises transforming a plant or plant cell with a nucleotide sequence operably linked to one of the promoters of the present disclosure.