Elucidating design principles for Ribozyme-Enabled Tissue Specificity (RETS) to allow precise expression without...

Area of Science:

• Plant biology
• Synthetic biology
• Molecular genetics

Background:

• Tissue-specific transgene expression is crucial for biological studies and organism engineering.
• Identifying suitable promoters for precise expression is challenging, especially in plants due to long prototyping timelines.
• Existing methods have limitations in studying native gene expression and engineering plant phenotypes.

Purpose of the Study:

• To introduce a novel strategy, Ribozyme Enabled Tissue Specificity (RETS), for achieving tissue-specific transgene expression in plants.
• To enable precise control over transgene expression without relying on characterized promoters.
• To demonstrate the utility of RETS for creating biosensors and engineering plant traits.

Main Methods:

• Developed RETS, a strategy utilizing split self-splicing ribozymes (based on a group I intron from Tetrahymena thermophila).
• Leveraged transcriptomic data to guide the design for conditional mRNA reconstitution.
• Optimized design features for transgene flexibility, enhanced expression, and evasion of RNA interference.

Main Results:

• Demonstrated successful tissue-specific and dose-dependent transgene expression in Arabidopsis thaliana using RETS.
• Showcased the creation of genetically encoded biosensors for studying spatiotemporal gene expression in planta.
• Illustrated the engineering of tissue-specific changes in organ size, demonstrating phenotypic control.

Conclusions:

• RETS offers a novel approach to study native gene expression patterns using non-destructive imaging, overcoming limitations of current techniques.
• The spatiotemporal control of transgene expression via RETS enables precision engineering of plant phenotypes.
• This technology facilitates crop enhancement without the drawbacks of constitutive expression, paving the way for improved agricultural applications.