Chimeric Plant Regulatory Elements for Tissue-Specific Gene Expression
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Solution Overview
Problem
Current plant genetic engineering lacks effective gene regulatory elements that can efficiently modulate gene expression in plants, particularly for traits like herbicide resistance and pest resistance, with existing regulatory elements often showing limited specificity and efficacy in different plant tissues.
Innovation Solution
Development of novel recombinant DNA molecules comprising regulatory elements with at least 85% sequence identity to specific DNA sequences (SEQ ID NOs: 2-8, 12-14, 16-19) operably linked to heterologous transcribable DNA molecules, including promoters, introns, and 3′ UTRs, which can be used to create transgenic plants with desired agronomic traits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing regulatory elements are used to modulate gene expression in plants, then gene expression can be controlled, but the specificity and efficacy in different plant tissues is limited
Solution Approach 1:
The patent applies local quality by creating chimeric promoter constructs that combine different promoter regions (e.g., CaMV 35S promoter with rice actin promoter elements) to achieve tissue-specific expression patterns. The regulatory elements are designed with specific sequence compositions (SEQ ID NOs: 2-8, 12-14, 16-19) that confer differential expression in root, shoot, leaf, or floral tissues, allowing the same transgene to be expressed with different efficiencies in different plant locations.
2Reliability
If regulatory elements with high sequence identity to native plant sequences are used, then gene expression modulation is effective, but the complexity of constructing recombinant DNA molecules increases
Solution Approach 1:
The patent segments regulatory elements into modular components including 5' upstream regions, 3' downstream regions, introns, and untranslated regions (UTRs). Each segment is independently characterized and can be combined in different configurations. The sequences are divided into specific functional domains (e.g., TATA box, enhancer regions, polyadenylation signals) that can be assembled through standard molecular cloning techniques, reducing the overall complexity of construction.
Solution Approach 2:
The patent creates composite regulatory elements by combining sequences from different sources (e.g., viral promoters like CaMV 35S with plant-specific elements, or combining sequences from different plant species). These chimeric constructs (comprising SEQ ID NOs: 2-8, 12-14, 16-19) integrate functional elements that work synergistically to achieve enhanced and tissue-specific gene expression, effectively creating a composite material with properties superior to individual components.
3Adaptability or versatility
If regulatory elements are designed for broad expression across plant tissues, then versatility is improved, but the precision of tissue-specific expression control is reduced
Solution Approach 1:
The patent employs dynamic regulatory elements whose expression activity can be modulated by environmental conditions, developmental stage, or tissue-specific factors. The chimeric promoter constructs contain responsive elements that allow the same regulatory sequence to exhibit different expression levels and patterns depending on the physiological context, enabling both broad versatility and precise tissue-specific control within a single regulatory element design.
Data Source
AI summary
The invention provides recombinant DNA molecules and constructs, as well as their nucleotide sequences, useful for modulating gene expression in plants. The invention also provides transgenic plants, plant cells, plant parts, and seeds comprising the recombinant DNA molecules operably linked to heterologous transcribable DNA molecules, as are methods of their use.