Boolean Computation in Plants Using Post-translational Genetic Control and a Visual Output Signal.

Area of Science:

• Plant Synthetic Biology
• Genetic Circuit Engineering
• Molecular Biology

Background:

• Plants possess significant potential for synthetic biology due to their autotrophic nature and complex metabolism.
• Plant synthetic biology development lags behind other taxonomic groups, necessitating novel engineering approaches.

Purpose of the Study:

• To engineer genetic circuits capable of performing Boolean logic computations (YES, OR, AND) in plant tissues.
• To develop a visual output signal for these genetic circuits using plant-endogenous pigments.

Main Methods:

• Genetic circuits were designed for Boolean logic operations and deployed using Agrobacterium tumefaciens.
• Conditional activity of the MYB transcription factor Rosea1 was used to induce anthocyanin accumulation.
• Protease cleavage sites and specific proteases were employed to restore the activity of fused transcription factors.

Main Results:

• Engineered genetic circuits successfully performed YES, OR, and AND Boolean computations in plant tissues.
• Anthocyanin accumulation, a visible output, was achieved, allowing for direct observation and spectrophotometric quantification.
• Fusion of Rosea1 to viral proteins inactivated it, but this could be rescued by protease cleavage.

Conclusions:

• This study demonstrates the feasibility of implementing complex genetic logic circuits in plants.
• The use of anthocyanin as a visual output provides a robust and easily detectable signal for synthetic gene circuits.
• The findings pave the way for advanced synthetic biology applications in plant systems.