Programmable Transcription Activators for Precise Plant Gene Activation
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Solution Overview
Problem
Existing methods for controlling gene expression in plants are limited in their ability to efficiently target and activate specific genes, particularly those with low basal expression levels, and often result in non-specific activation of off-target genes.
Innovation Solution
Development of programmable transcription activators (PTAs) that utilize plant-derived activation domains (ADs) fused to DNA-binding domains, such as dCas9, to specifically target and enhance expression of target genes, including those with low basal expression, using systems like dCas9-SunTag and MoonTag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods for controlling gene expression in plants are used, then gene expression can be controlled, but the ability to efficiently target and activate specific genes with low basal expression levels is limited and off-target activation occurs
Solution Approach 1:
The transcription activator is divided into separate modular components: a DNA-binding domain (such as dCas9 or TALE DNA-binding domain) that can be programmed to recognize specific target sequences, and a transcriptional activation domain (such as VP64, VPR, or plant-derived ADs) that activates gene expression. This segmentation allows independent optimization of targeting precision and activation strength, resolving the contradiction between targeting precision and specificity.
Solution Approach 2:
The invention creates a universal programmable transcription activator system that can be applied across different plant species and target genes by combining a standardized activation domain with programmable DNA-binding domains. The system universally addresses the need for precise targeting while maintaining high specificity through the modular architecture that separates binding function from activation function.
2Power
If strong activation domains are used to activate target genes with low basal expression, then activation strength increases, but off-target effects increase
Solution Approach 1:
By separating the DNA-binding function from the activation function into distinct modular domains, the system allows the activation domain to be optimized for strength while the DNA-binding domain is optimized for specificity. The segmented architecture ensures that strong activation is only exerted at the precise target location defined by the programmable binding domain, preventing off-target activation.
Solution Approach 2:
The programmable DNA-binding domain acts as an intermediary that bridges the activation domain and the target DNA sequence. It specifically recognizes and binds to the target sequence through programmable base-pairing interactions, thereby mediating the delivery of the activation domain only to the intended target and preventing off-target effects while maintaining strong activation at the correct locus.
Data Source
AI summary
Methods and materials for stimulating expression of target genes in plants are provided herein.