Chemical-inducible, ecdysone receptor-based gene expression system for plants

Area of Science:

• Plant Biotechnology
• Molecular Biology
• Gene Regulation

Background:

• Controlling gene expression in plants is crucial for agricultural applications.
• Existing inducible systems often lack efficiency or have safety concerns.

Purpose of the Study:

• To develop a novel, highly efficient, and safe inducible gene expression system for plants.
• To utilize the spruce budworm ecdysone receptor (EcR) and methoxyfenozide for transgene regulation.

Main Methods:

• Constructed chimeric transcription activators with EcR ligand binding domain, GAL4/LexA DNA binding domains, and VP16 activation domain.
• Utilized a luciferase reporter gene under the control of GAL4A or LexA response elements and a minimal 35S promoter.
• Optimized gene expression by varying reporter and activator gene orientations in transgenic Arabidopsis and tobacco plants.

Main Results:

• Achieved low basal and high induced luciferase expression in the presence of methoxyfenozide.
• Demonstrated several-fold higher induced expression compared to the constitutive 35S promoter.
• Showcased precise control of gene expression across a range of methoxyfenozide concentrations.

Conclusions:

• The developed EcR-methoxyfenozide system provides effective and tunable transgene regulation in plants.
• The system's suitability for field applications is supported by the commercial availability and safety profile of methoxyfenozide.