Zea mays Chlorophyll a/b Binding Protein Regulatory Elements for Transgene Expression
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Solution Overview
Problem
Current methods for expressing transgenes in plants face challenges such as gene silencing and inefficient expression patterns due to the use of repetitive promoters and 3' UTRs, leading to suboptimal performance of transgenic crops, particularly in achieving tissue-specific and developmental stage-specific expression of agronomic traits.
Innovation Solution
The use of Zea mays chlorophyll a/b binding protein gene regulatory elements, including specific 3' UTRs and promoters, to drive the expression of transgenes in plants, allowing for constitutive or tissue-specific expression of desirable traits like insecticidal resistance, herbicide tolerance, and nutritional quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If repetitive promoters and 3' UTRs are used to drive transgene expression, then transgene expression levels increase, but gene silencing occurs and expression stability deteriorates
Solution Approach 1:
The patent uses non-repetitive promoters and 3' UTRs from the Zea mays chlorophyll a/b binding protein gene to replace repetitive regulatory elements. This segmentation of the expression system into unique, non-repetitive components prevents homology-dependent gene silencing while maintaining high expression levels of transgenes.
2Productivity
If constitutive promoters are used to drive transgene expression, then expression levels increase, but tissue-specific expression control is lost
Solution Approach 1:
The patent employs promoters and 3' UTRs that can be selected to provide either constitutive or tissue-specific expression patterns. By using regulatory elements from the Zea mays chlorophyll a/b binding protein gene, the system achieves high expression levels while maintaining the ability to control expression in specific tissues or developmental stages, thus providing local quality control.
Data Source
AI summary
This disclosure concerns compositions and methods for promoting transcription and translation of a nucleotide sequence in a plant or plant cell, employing a 3′UTR from Zea mays chlorophyll a/b binding protein gene. Some embodiments relate to a 3′ UTR from a Zea mays chlorophyll a/b binding protein gene that functions in plants to terminate transcription of operably linked nucleotide sequences.