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Updated: Jul 14, 2026
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Inducible T7 RNA Polymerase-mediated Multigene Expression System, pMGX
Published on: June 27, 2017
Development and validation of a robust and versatile one-plasmid regulated gene expression system
Paul Szymanski1, Peter J Kretschmer, Maxine Bauzon
1Department of Gene Technologies, Berlex Biosciences, Richmond, California, USA. Paul.Szymanski@bayer.com
Summary
Researchers created the pBRES system, a single-plasmid gene expression tool. This adaptable system offers tightly controlled gene expression, comparable to existing methods but in a more convenient format.
Area of Science:
- Molecular Biology
- Gene Therapy
- Biotechnology
Background:
- Gene expression regulation is crucial for various biological processes and therapeutic applications.
- Existing inducible systems often require multiple plasmids, complicating their use.
- The development of a single-plasmid system offers potential advantages in simplicity and efficiency.
Purpose of the Study:
- To develop a novel one-plasmid regulated gene expression system (pBRES) based on a mifepristone (MFP)-inducible two-plasmid system.
- To create a modular and customizable system for tailored gene expression in specific tissues or conditions.
- To evaluate the performance of the pBRES system in terms of induced and uninduced gene expression levels and its applicability in vivo.
Main Methods:
- Construction of the pBRES system by integrating expression elements (promoters, UTRs, introns, target genes, polyA sequences) into a single plasmid, with modular components flanked by restriction sites.
- Systematic analysis of different orientations of expression units and various expression elements/target genes.
- In vivo comparison of pBRES system performance against a two-plasmid system and the cytomegalovirus (CMV) promoter.
- Integration of a pBRES expression cassette into an adeno-associated virus (AAV) vector for in vivo gene expression studies.
Main Results:
- The pBRES system allows for modular replacement of expression elements and target genes, enabling customization.
- Orientation and gene-specific effects on expression levels were observed.
- Induced gene expression from pBRES was comparable to the two-plasmid system and superior to CMV promoter in vivo.
- Low uninduced expression levels were maintained.
- Regulated gene expression was achieved in vivo using an AAV vector carrying the pBRES cassette for up to one year.
Conclusions:
- The pBRES system provides a versatile and efficient one-plasmid solution for regulated gene expression.
- Its modularity allows for fine-tuning of expression for diverse applications.
- The system demonstrates robust performance in vivo and potential for long-term gene therapy applications using AAV vectors.
