Plant Regulatory Elements with Codon-Redesigned GUS Low-Level Detection
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Solution Overview
Problem
Existing plant biotechnology lacks efficient and sensitive methods for characterizing gene expression patterns and levels, particularly for promoters that express at low levels, leading to challenges in accurately assessing the performance of transgenes and potential negative consequences such as off-phenotypes and yield drag.
Innovation Solution
The use of a codon-redesigned β-glucuronidase (GUS) coding sequence, operably linked with plant-derived regulatory elements, enhances the sensitivity of gene expression assays, allowing for more precise characterization of promoter activity and transgene expression patterns in plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional GUS reporter systems are used to characterize gene expression, then the assay can detect gene expression, but the sensitivity is insufficient for low-expressing promoters leading to inaccurate assessment
Solution Approach 1:
The patent applies parameter changes by redesigning the codon usage in the GUS coding sequence to optimize it for plant expression systems. This codon optimization increases the translation efficiency and expression level of the GUS reporter, thereby enhancing the sensitivity and accuracy of gene expression detection without altering the fundamental function of the reporter system.
Solution Approach 2:
The patent creates an optimized copy of the GUS coding sequence with improved codon usage that is tailored for plant expression. This copied and modified version of the GUS gene maintains the original reporter function while achieving superior sensitivity and reliability in detecting low-level promoter activity.
2Measurement precision
If enhancers are used to boost gene expression detection, then sensitivity improves, but unintended effects on plant phenotype such as off-phenotypes and yield drag occur
Solution Approach 1:
The patent extracts and removes the need for enhancer elements by directly optimizing the GUS coding sequence itself. Instead of adding external enhancer components that could cause harmful effects, the solution focuses on modifying the reporter gene's codon structure to achieve high sensitivity independently, thereby avoiding off-phenotypes and yield drag.
Solution Approach 2:
The optimized codon structure of the GUS gene acts as an intermediary that enhances detection sensitivity without requiring additional enhancer elements. This intermediary optimization of the reporter itself provides the necessary sensitivity improvement while avoiding the harmful side effects associated with using enhancers.
Data Source
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AI summary
The invention provides recombinant DNA molecules and constructs, and their nucleotide sequences, useful for modulating gene expression in plants. The invention also provides transgenic plants, plant cells, plant parts, and seeds comprising a recombinant DNA molecule comprising a DNA molecule operably linked to a heterologous transcribable DNA molecule, as well as methods of their use.