SCBV Enhancer for Plant Transcriptional Activity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for genetic regulatory elements that can effectively control and enhance the expression of transcribable nucleic acids in genetically engineered organisms, such as plants, to regulate gene expression and protein production.
Innovation Solution
The use of novel transcription regulatory regions comprising an enhancer domain with multiple copies of a previously unrecognized SCBV enhancer arranged in tandem, which are operably linked to a promoter containing an RNA polymerase binding site and a mRNA initiation site, to enhance transcriptional activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional promoters are used to drive transgene expression, then basic transcriptional activity is achieved, but transcriptional enhancement and protein production levels are insufficient
Solution Approach 1:
The patent combines the SCBV enhancer element with conventional plant promoters (such as CaMV 35S promoter or ubiquitin promoter) to create a hybrid transcriptional control system. This merging of viral enhancer functionality with plant promoter basal transcription machinery results in significantly enhanced transcriptional activity and protein production levels compared to using conventional promoters alone.
Solution Approach 2:
The invention creates a composite transcriptional regulatory element by integrating the SCBV enhancer sequence (positions 337-618) with promoter sequences from plant viruses or plant genes. This composite structure leverages the strong transcriptional activation capability of the viral enhancer combined with the tissue-specific or constitutive expression patterns of the plant promoter, achieving both high expression levels and controlled specificity.
2Productivity
If transcriptional enhancement is achieved through viral enhancer elements, then protein production increases, but the complexity of the genetic construct increases
Solution Approach 1:
The patent extracts only the critical enhancer domain (positions 337-618) from the complete SCBV genome, rather than using the entire viral genome or large portions of it. This extracted enhancer element can be operably linked to minimal promoter sequences to achieve the desired transcriptional enhancement with reduced overall construct complexity compared to using complete viral genomes.
Solution Approach 2:
The invention optimizes the configuration of the enhancer-promoter construct by varying parameters such as the number of enhancer repeats, the specific promoter sequence used, and the orientation of the enhancer element. These parameter adjustments allow tuning of the expression level while managing construct complexity, enabling researchers to achieve the minimum necessary enhancement without excessive genetic material.
Data Source
AI summary
Identification of new enhancer sequence has significant utility in the plant functional genomics. The sugarcane bacilliform badnavirus (SCBV) transcriptional enhancer has been identified. This enhancer can be used to increase the rate of transcription from gene promoters and in activation tagging experiments. A ten-fold increase in transcription was observed when a 4× array of the SCBV enhancer was placed upstream of a truncated form of the maize alcohol dehydrogenase minimal promoter. Methods of using the SCBV transcriptional enhancer are described, as are chimeric transcription regulatory regions, constructs, cells, tissues, and organisms that comprise one or more copies of the enhancer.