Transient Plant Expression Predictive Model
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Solution Overview
Problem
Current methods for transiently expressing genes in plants, such as agro-infiltration and viral vectors, face challenges like low protein expression levels, inconsistency, and limited host range, making it difficult to predict how genes or expression cassettes will perform in stable transgenic plants, especially in monocots like maize and wheat.
Innovation Solution
A method and composition for transiently expressing proteins in plants using agro-infiltration with a binary vector containing an expression cassette, which provides a predictive model for stable transgenic plants, allowing for evaluation of promoter performance, gene expression, and protein targeting across various plant species, including cereal crops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If agro-infiltration method is used for transient expression, then the method is simple and rapid, but protein expression levels are very low
Solution Approach 1:
The patent combines agro-infiltration with particle bombardment in a sequential two-step process. First, Agrobacterium is infiltrated into plant tissue to deliver T-DNA. Then, gold particles coated with additional DNA are bombarded onto the same tissue. This merging of two transformation methods allows the plant cells to receive multiple genetic elements that work together to achieve high-level transient expression, overcoming the low protein expression limitation of agro-infiltration alone.
2Quantity of substance
If viral vectors are used for transient expression, then high expression levels are achieved, but host range is limited and gene size is restricted
Solution Approach 1:
The patent uses Agrobacterium as an intermediary delivery system that can accommodate large DNA constructs without the size limitations of viral vectors. The binary vector system allows flexible insertion of large gene sequences, and the two-step process with particle bombardment adds additional genetic elements. This intermediary approach enables transient expression of large genes in a broad host range including monocots, overcoming the versatility limitations of viral vectors.
3Stability of the object's composition
If stable transgenic plant lines are established, then long-term expression is achieved, but the process takes more than two years
Solution Approach 1:
The patent performs preliminary evaluation of expression cassettes, promoters, and genetic elements using transient expression before committing to stable transformation. The two-step agro-infiltration/bombardment method allows rapid testing of multiple constructs in weeks rather than years. This preliminary action identifies the most promising candidates for stable transformation, reducing the overall development time by eliminating unsuccessful candidates early in the process.
4Productivity
If conventional transient expression methods are used, then rapid evaluation is possible, but results are inconsistent and not predictive of stable expression
Solution Approach 1:
The patent changes multiple parameters simultaneously: uses a binary vector system with specific promoter-cassette configurations, employs two-step delivery method, and optimizes the timing and composition of DNA delivery. These parameter changes create a transient expression system whose results consistently predict stable expression outcomes. The specific combination of Agrobacterium infiltration followed by particle bombardment with optimized DNA coatings produces reproducible results that correlate with stable transformation success.
Data Source
AI summary
Compositions and methods for transiently expressing proteins in a plant are provided. The compositions comprise plants, seeds, plant tissues, and plant parts expressing a protein, wherein the protein is expressed transiently and the transient expression of the protein can be used as a predictive model of how said protein will be expressed in stable transgenic plants in regards to qualitative and quantitative data. The predictive model may be used but is not limited to: promoter evaluation, evaluation of expression cassette construction for best performance (e.g. addition of enhancers or gene silencing suppressors), evaluation of best ways to express heterologous genes (e.g. point mutations, targeting), fast evaluation of endogenous gene knockout, evaluation of protein expression levels, cellular targeting, tissue targeting, transcriptional enhancers, translational enhancer protein toxicity and metabolic profiling. Further provided are methods of use.