BRRV Promoter Tissue-Preferred Expression in Plants
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Solution Overview
Problem
Current plant genetic engineering techniques face challenges in site-specific regulation of gene expression, particularly in directing the synthesis of desirable proteins or compounds to specific tissues to maximize commercial applications, such as producing pathogen-resistant traits without affecting edible tissues.
Innovation Solution
Development of novel nucleotide sequences derived from a blueberry red ringspot virus (BRRV) isolate, including a full-length, truncated, and duplicated promoter, which drives constitutive expression and tissue-preferred expression in plants, allowing for the modulation of gene expression in selected tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constitutive promoters are used to drive continuous gene expression throughout plant cells, then productivity is improved, but the ability to direct expression to specific tissues is lost
Solution Approach 1:
The patent applies local quality by creating promoters with tissue-preferred expression capabilities. The BRRV promoter variants are engineered to drive high-level expression specifically in green tissues (leaves, stems) while minimizing expression in non-green tissues (roots, flowers). This allows the expression system to have different expression characteristics in different tissue locations, resolving the contradiction between continuous expression and tissue-specific regulation.
2Manufacturing precision
If tissue-preferred promoters are used to direct expression to specific tissues, then manufacturing precision is improved, but overall productivity decreases
Solution Approach 1:
The patent employs parameter changes by modifying the BRRV promoter sequence to create variants with enhanced green tissue preference. Through truncation and duplication of specific promoter regions, the expression pattern parameter is optimized to concentrate expression in green tissues while maintaining high expression levels. This allows simultaneous achievement of tissue-specific precision and high productivity within the target tissue compartment.
3Reliability
If inducible promoters are used to activate transcription in response to pathogens, then reliability of pathogen defense is improved, but response time and complexity increase
Solution Approach 1:
The patent applies self-service by utilizing the plant's own green tissue identity and metabolic activity to drive promoter expression. The BRRV promoter variants automatically activate expression in green tissues through intrinsic regulatory elements that respond to plant physiological states rather than requiring external pathogen induction. This simplifies the regulatory mechanism while maintaining reliable expression in the desired tissue compartment where pathogen defense is most needed.
Data Source
AI summary
The present disclosure provides compositions and methods for regulating expression of heterologous nucleotide sequences in a plant. Compositions include a novel nucleotide sequence for a promoter. A method for expressing a heterologous nucleotide sequence in a plant using the promoter sequence disclosed herein is provided. The method comprises stably incorporating into the genome of a plant cell a nucleotide sequence operably linked to the promoter of the present invention and regenerating a stably transformed plant that expresses the nucleotide sequence.