Coupling Cell Communication and Optogenetics: Implementation of a Light-Inducible Intercellular System in Yeast

Area of Science:

• Synthetic biology
• Optogenetics
• Microbial cell communication

Background:

• Cell communication is vital for biological processes like survival and differentiation.
• Synthetic systems using chemical induction have been developed to study cell communication.
• Optogenetics offers precise control over biological systems using light.

Purpose of the Study:

• To couple optogenetics with cell communication in Saccharomyces cerevisiae.
• To develop a synthetic system for light-dependent intercellular signaling.
• To investigate how external light information can modulate gene expression in microbial populations.

Main Methods:

• Utilized two strains of Saccharomyces cerevisiae engineered for optogenetic control.
• Coupled light-dependent α-factor pheromone production in one strain with gene expression induction in another.
• Employed luciferase as a reporter gene to quantify system response.
• Evaluated system performance under various light conditions (constant light, darkness, light/dark transitions) and cell ratios.

Main Results:

• Demonstrated light-dependent activation of gene expression in co-cultured yeast strains upon blue light exposure.
• Showed that the system response is light-specific, with no activation in darkness.
• Indicated that the response amplitude can be tuned by altering the initial ratio of the two cell strains.
• Observed higher fold inductions in the two-population system compared to autonomous strains.

Conclusions:

• External light information can be effectively propagated through a diffusible signaling molecule to control gene expression in a synthetic microbial system.
• This optogenetic intercellular system provides a novel platform for controlling population-level dynamics.
• Paves the way for future studies on optogenetic control of microbial communities.