Chimeric Plant Promoters Resolving Genetic Stability

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Solution Overview

Problem

There is a shortage of engineered promoters in plant molecular biology, and the repeated use of the same promoter for gene expression can lead to promoter sequence homology-based genetic rearrangements and gene silencing in transgenic plants, highlighting the need for unique and heterologous promoters.

Innovation Solution

Development of unique, non-naturally occurring promoters derived from DNA fragments or full sequences of specific viruses, such as Peanut Chlortic Streak Virus and Figwort Mosaic Virus, including PFlt-UAS-2X, FSgt-PFlt, and MSgt-PFlt, which are constructed by inserting or ligating sub-genomic transcript promoter fragments to enhance gene expression in plants.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the same promoter is repeatedly used for expressing multiple genes in transgenic plants, then gene expression is achieved, but promoter sequence homology leads to genetic rearrangement and gene silencing

Engineering Contradiction:

Improvegene expression efficiencyVSAvoidgenetic stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The promoter is divided into functional modules (UAS region, core promoter elements) that can be independently selected and combined from different viral sources, allowing creation of unique promoter sequences while maintaining functional integrity for gene expression

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Chimeric promoters are constructed by combining promoter fragments from different viral genomes (e.g., PC1SV and FMV) to create hybrid promoter sequences that maintain gene expression capability while avoiding sequence homology-induced silencing

Inventive Principle:

Principle #40Composite materials

2Reliability

If engineered promoters are developed to avoid homology issues, then genetic stability is improved, but the shortage of available promoters persists

Engineering Contradiction:

Improvegenetic stabilityVSAvoidpromoter availability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

A universal promoter construction system is established using modular viral promoter fragments that can be universally combined and recombined to generate diverse unique promoters for multiple gene expression applications in plant molecular biology

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If viral promoter fragments are combined to create unique promoters, then promoter diversity is increased, but the complexity of promoter construction increases

Engineering Contradiction:

Improvepromoter diversityVSAvoidpromoter construction complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Viral promoters are segmented into standardized functional modules (UAS, TATA box, other cis-elements) that can be systematically assembled, reducing construction complexity while enabling diverse promoter combinations

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9322028B1Unique nucleic acid promoter formed from two or more promoter sequences

Publication Date: 2016.04.26 UNIVERSITY OF KENTUCKY RESEARCH FOUNDATION

AI summary

Non-naturally occurring DNA promoters, include MSGT-PFlt, PFlt-UAS-2X and FSgt-PFlt. The MSGT-PFlt was developed and has expression shown to be equivalent to that of CaMV35S promoter. DNA promoters PFlt-UAS-2X and FSgt-PFlt were developed and tested in transient and transgenic system and found to be stronger than the CaMV35S promoter.