Maize GRMZM2G078441 Seed-Specific Promoter for Transgene Expression
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Solution Overview
Problem
There is a limited repertoire of promoters that effectively express foreign or heterologous proteins at high levels specifically in seed tissues of plants, particularly cereals, and current promoters often result in unintended expression in non-seed tissues, potentially harming plant health and complicating protein production processes.
Innovation Solution
The use of the unclassified gene GRMZM2G078441 promoter and its variants, which are identified as highly active in maize embryo tissues, to drive high levels of transgene expression specifically in seed tissues, allowing for the production of cost-sensitive foreign proteins with improved tissue specificity and reduced silencing phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional promoters are used to drive gene expression in plants, then gene expression can be achieved, but expression occurs in non-seed tissues which may harm plant health and complicate protein production
Solution Approach 1:
The patent applies local quality by using the GRMZM2G078441 promoter to achieve tissue-specific expression exclusively in seed tissues (endosperm and embryo) while preventing expression in non-seed tissues. This localized expression control resolves the contradiction by confining protein production to the desired location (seeds) without harmful effects on other plant tissues, thereby improving productivity while protecting plant health.
2Manufacturing precision
If the GRMZM2G078441 promoter is used to achieve high-level seed-specific expression, then tissue specificity is improved, but the promoter sequence complexity increases
Solution Approach 1:
The patent applies the taking out principle by isolating and utilizing only the essential regulatory elements of the GRMZM2G078441 promoter (specifically the -1080 to -78 bp region containing critical cis-regulatory elements) that are sufficient to achieve seed-specific expression. This extracted core promoter sequence provides high tissue specificity while minimizing unnecessary sequence complexity, resolving the contradiction between precision and complexity.
3Productivity
If high levels of foreign protein expression are achieved in seed tissues, then commercial viability is improved, but expression in metabolically active tissues may have detrimental effects on plant health
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through seed-specific promoter control. The GRMZM2G078441 promoter ensures that high-level foreign protein expression is confined exclusively to seed tissues (endosperm and embryo) where it does not interfere with essential metabolic activities. This spatial restriction allows high productivity in seeds while maintaining plant health stability in metabolically active tissues.
Solution Approach 2:
The promoter acts as an intermediary element that mediates between the foreign gene and the plant's transcriptional machinery, directing expression only in appropriate tissues. The GRMZM2G078441 promoter serves as a selective gateway that permits high-level expression in seeds (improving commercial viability) while blocking expression in metabolically active tissues (protecting plant health), thus resolving the contradiction.
Data Source
AI summary
This invention is in the field of plant biology and agriculture and relates to novel seed specific promoter regions. The present invention further provide methods of producing proteins and other products of interest and methods of controlling expression of nucleic acid sequences of interest using the seed specific promoter regions.