Eep5 Promoter for Maize Endosperm Gene Expression
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Solution Overview
Problem
There is a need for isolated nucleotide sequences that serve as early-endosperm-preferred promoters, specifically active in the basal endosperm transfer layer (BETL) of maize seeds, to regulate gene expression during early seed development and impact various plant traits.
Innovation Solution
The development of novel nucleotide sequences and DNA constructs comprising a BETL-preferred promoter, known as eep5, which initiates transcription in a tissue-preferred manner, particularly in the BETL of maize seeds, allowing for the regulation of heterologous nucleotide sequences and the modulation of plant phenotypes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tissue-preferred promoter is used to express a DNA sequence in particular tissues or organs, then the specificity of gene expression is improved, but the complexity of the expression system increases
Solution Approach 1:
The patent extracts and utilizes the native promoter sequence from the early embryonic endosperm protein 5 (eep5) gene to create a tissue-preferred promoter. By taking out the promoter region and operably linking it to heterologous DNA sequences of interest, the invention achieves specific expression in the basal endosperm transfer layer without requiring complex engineered regulatory systems.
2Adaptability or versatility
If an inducible promoter is used to express a DNA sequence in response to a stimulus, then the responsiveness of gene expression is improved, but the complexity of the expression system increases
Solution Approach 1:
The eep5 promoter functions as a self-regulating element that automatically activates transcription in response to developmental cues during early endosperm formation. The promoter inherently responds to physiological stimuli present during seed development without requiring external induction systems or complex regulatory components.
3Productivity
If a constitutive promoter is used to achieve continuous expression throughout plant cells, then the level of gene expression is improved, but the tissue specificity is lost
Solution Approach 1:
The patent applies local quality by restricting gene expression to a specific tissue location - the basal endosperm transfer layer. The eep5 promoter drives high-level transcription specifically in this tissue during early development (6-30 days post-pollination), achieving both high productivity and precise spatial control through its tissue-preferred activity pattern.
Data Source
AI summary
Compositions and methods for regulating expression of heterologous nucleotide sequences in a plant are provided. Compositions include a novel nucleotide sequence for a maize early endosperm 5 (eep5) promoter. Also provided is a method for expressing a heterologous nucleotide sequence in a plant using a promoter sequence disclosed herein.