In Planta Transient Expression via Leaf Roll Infiltration
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Solution Overview
Problem
Current methods for transiently expressing nucleotide sequences in monocot plants are inefficient and labor-intensive, particularly due to limitations in agroinfiltration techniques which result in high assay variation and low protein expression levels.
Innovation Solution
A novel in planta transient assay method involving wounding a developing leaf roll inside the stem and Agrobacterium infiltration of an expression cassette, which significantly increases transient protein expression levels and reduces assay variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If syringe infiltration method is used for transient expression in monocots, then the procedure can be performed, but the protein expression level is low and assay variation is high
Solution Approach 1:
The invention changes the target parameter from mature leaves to emerging leaf rolls inside the stem. This parameter change in target tissue selection enables both higher protein expression levels (5-fold increase) and reduced assay variation (CV ≤ 20%) simultaneously, resolving the technical contradiction between quantity of substance and reliability
2Productivity
If agroinfiltration is performed through stomata in mature leaves, then the method can be applied, but the procedure is labor intensive and has high assay variation
Solution Approach 1:
The invention performs preliminary action by targeting emerging leaf rolls before they emerge from the stem. This timing allows Agrobacterium to infect the tissue during its development phase, resulting in higher transformation efficiency and lower assay variation, thereby improving both productivity and reliability
3Ease of manufacture
If traditional transient expression methods are used, then the procedure is simple, but the protein expression level is insufficient for downstream applications
Solution Approach 1:
The invention applies local quality by selecting a specific tissue location (emerging leaf rolls inside the stem) that has unique properties favorable for transient expression. This localized approach achieves high protein expression levels while maintaining procedural simplicity, as the infection is applied to a confined, accessible region
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
This method allows for a 5-fold increase in transient protein expression levels compared to traditional syringe infiltration methods, enables the analysis of up to 100 constructs in a single experiment with reduced variation, and facilitates the generation of large amounts of fresh transiently expressed tissue for bioassays or protein production.
Implementation Method 1
wounding a plant part
Implementation Method 2
Agrobacterium-infiltrating of an expression cassette comprising at least one nucleotide sequence operably linked to a promoter into the plant part in planta
Implementation Method 3
transiently expressing said at least one nucleotide sequence in the plant part
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.