Mutated TATA-box/TATA binding protein complementation system for regulated transgene expression in tobacco

Area of Science:

• Plant Molecular Biology
• Gene Expression Regulation
• Biotechnology

Background:

• Controlling transgene expression is crucial for plant biotechnology.
• TATA-dependent promoters are widely used but require precise regulation.
• Developing novel systems for tissue-specific gene expression is an ongoing challenge.

Purpose of the Study:

• To develop and characterize a two-component system for tightly regulated, seed-specific transgene expression in plants.
• To investigate the functionality of a mutated TATA motif and a modified transcription factor for gene regulation.
• To demonstrate high-level expression of reporter genes in transgenic plants using this novel system.

Main Methods:

• Construction of a two-component expression system with an expression module (mutated TATA promoter) and a regulatory module (mutated transcription factor TBPm(3)).
• Design and transformation of vectors into tobacco plants, testing components individually and in combination.
• Utilizing the gusA reporter gene to assess seed-specific expression driven by the engineered promoter in transgenic tobacco.

Main Results:

• The mutated TATA promoter (TGTA) was non-functional on its own, demonstrating complete inactivation.
• The expression module became transcriptionally active only in the presence of the regulatory module expressing TBPm(3).
• High-level, tightly seed-specific expression of the gusA reporter gene was achieved in transgenic tobacco plants.

Conclusions:

• The combination of the TGTA promoter mutation and the TBPm(3) transcription factor provides a robust mechanism for inducible gene expression.
• This two-component system enables precise control over transgene expression, achieving high levels in a tissue-specific manner.
• The developed system holds potential for applications requiring tightly regulated gene expression in plants, particularly for seed-specific traits.