Noise-resistant and synchronized oscillation of the segmentation clock

Area of Science:

• Developmental biology
• Cellular oscillations
• Embryogenesis

Background:

• The segmentation clock, comprising cellular oscillators, controls periodic somite segmentation in vertebrate embryos.
• While single oscillators driven by hairy negative-feedback loops are understood, system-level properties of the segmentation clock remain largely unknown.

Purpose of the Study:

• To investigate the system-level properties of the segmentation clock.
• To explore how cellular oscillators synchronize and maintain coherence during embryonic development.

Main Methods:

• Utilized zebrafish as a model organism for in vivo mosaic experiments.
• Employed mathematical simulations to analyze the segmentation clock's response to stimuli.
• Investigated Notch-dependent intercellular communication pathways.

Main Results:

• Demonstrated that the segmentation clock functions as a coupled oscillator system.
• Showed that Notch signaling, regulated by the hairy oscillator, synchronizes neighboring cells.
• Identified that intercellular coupling minimizes noise from stochastic gene expression and cell proliferation.

Conclusions:

• The segmentation clock relies on coupled cellular oscillators for synchronized oscillation.
• Notch-dependent intercellular communication is crucial for maintaining oscillation coherence.
• Robustness of the segmentation clock is achieved through noise minimization via intercellular coupling.