Rewiring gene circuits to dissect oscillatory signaling dynamics

Area of Science:

• Developmental Biology
• Synthetic Biology
• Cell Signaling

Background:

• Intercellular communication is crucial for cellular decision-making during embryonic development.
• The segmentation clock, an oscillatory gene network, regulates periodic segmentation of the presomitic mesoderm (PSM) in vertebrate embryos.
• DELTA-NOTCH signaling is hypothesized to couple oscillations between neighboring cells in the PSM.

Purpose of the Study:

• To experimentally test the role of DELTA-NOTCH signaling in coupling cellular oscillations.
• To reconstitute and analyze intercellular communication using synthetic biology approaches.

Main Methods:

• Integration of a synthetic DELTA-NOTCH pathway into DELTA-deficient presomitic mesoderm (PSM) organoids.
• Utilizing optogenetic activation to control synthetic ligand presentation dynamics.
• Reconstitution of cell-cell communication in a developmental context.

Main Results:

• Restoration of cell-cell communication in DELTA-deficient PSM organoids by the synthetic DELTA-NOTCH pathway.
• Demonstration that the dynamics of ligand presentation are critical for effective intercellular communication.
• Direct experimental evidence for the importance of oscillatory cell-cell signaling in embryonic development.

Conclusions:

• The study directly demonstrates the importance of oscillatory cell-cell signaling in vertebrate embryonic development.
• Synthetic biology provides a powerful tool for dissecting complex biological processes like segmentation.
• This work offers a blueprint for future studies employing synthetic circuits to investigate developmental mechanisms.