Pattern Formation and Bistability in a Synthetic Intercellular Genetic Toggle

Area of Science:

• Synthetic biology
• Microbial engineering
• Developmental biology

Background:

• Cell differentiation is crucial for multicellular organism development, guided by morphogens and signaling molecules.
• Synthetic biologists aim to engineer patterned differentiation in microbial communities.
• Toggle switches are common regulatory components in cellular differentiation.

Purpose of the Study:

• To develop a synthetic circuit that enables patterned differentiation in bacteria.
• To investigate the behavior of a coupled synthetic toggle switch and intercellular signaling system.
• To explore the potential for engineering spatially patterned bacterial communities.

Main Methods:

• Coupling a synthetic corepressive toggle switch with intercellular signaling pathways.
• Creating a novel "quorum-sensing toggle" circuit.
• Testing the circuit's bistability in well-mixed liquid cultures.
• Analyzing pattern formation in bacterial colonies on agar with an external morphogen.

Main Results:

• The quorum-sensing toggle circuit demonstrated population-wide bistability in liquid cultures.
• The circuit successfully generated spatial patterns of differentiation in bacterial colonies.
• The engineered circuit responded to an externally supplied morphogen to induce patterning.

Conclusions:

• The synthetic quorum-sensing toggle is a viable tool for controlling bacterial differentiation and patterning.
• This circuit enables the engineering of spatially patterned bacterial communities.
• Future applications include developing advanced biomaterials and bioelectronics using engineered bacteria.