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Embryonic cells synchronize via a "winner-takes-it-all" mechanism, matching one input rhythm. This study reveals nonreciprocal coupling rules in vertebrate segmentation, similar to neurons and fireflies.

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Area of Science:

  • Developmental biology
  • Systems biology
  • Biophysics

Background:

  • Synchronization of coupled oscillators is a universal phenomenon across various systems.
  • Vertebrate body axis segmentation relies on synchronized signaling oscillations in the presomitic mesoderm (PSM).
  • Notch-signaling and cell-to-cell contact are known to be required for PSM cell synchronization, but coupling rules remain unclear.

Purpose of the Study:

  • To identify the specific coupling rules governing oscillator synchronization in embryonic cells.
  • To understand the synchronization dynamics within the presomitic mesoderm during vertebrate development.

Main Methods:

  • Development of a novel experimental assay to quantify synchronization dynamics in mixtures of oscillating cell ensembles.
  • Utilizing known initial input frequency and phase distribution for analysis.
  • Combining theoretical modeling with experimental validation.

Main Results:

  • Demonstrated a "winner-takes-it-all" synchronization outcome, where the collective rhythm adopts one of the input rhythms.
  • Developed the "Rectified Kuramoto" (ReKu) model to describe the observed synchronization.
  • Identified phase-dependent, nonreciprocal interactions as key features of the coupling.

Conclusions:

  • The study elucidates the nonreciprocal synchronization rules in embryonic oscillators.
  • These rules establish fundamental similarities between embryonic segmentation oscillators and collective behaviors in neurons and fireflies.
  • Nonreciprocal synchronization is linked to higher-level computations in collective behaviors.