Segmentation and somitogenesis derived from phase dynamics in growing oscillatory media

Area of Science:

• Developmental Biology
• Biophysics
• Systems Biology

Background:

• Embryonic development involves forming repetitive structures along the growth axis.
• Axial segmentation, particularly somitogenesis, is a fundamental process in vertebrate development.
• The underlying mechanisms of somitogenesis, including the role of oscillatory gene expression, are not fully understood.

Purpose of the Study:

• To apply the novel flow-distributed oscillator (FDO) mechanism to explain axial segmentation and somitogenesis.
• To investigate if FDO wave formation conditions are met during somitogenesis in chick and mouse.
• To provide a physical basis for the hypothesis that segmental clock phase dynamics control somitogenesis.

Main Methods:

• Application of the flow-distributed oscillator (FDO) mechanism to somitogenesis.
• Mimicking FDO waves using an inorganic experiment.
• Constructing and testing an FDO-based computational model of somitogenesis against experimental data, including heat shock effects.

Main Results:

• The FDO mechanism provides conditions satisfied during somitogenesis in chick and mouse.
• Observed gene expression waves arise from phase dynamics in a growing oscillatory medium.
• The FDO mechanism successfully mimicked experimental wave patterns and predicted the correct wavelength.
• The FDO-based model accurately reproduced experimental observations, including responses to heat shock.

Conclusions:

• The FDO mechanism offers a rigorous physical explanation for somitogenesis wave patterns.
• Phase dynamics within a growing oscillatory medium drive somitogenesis.
• This mechanism is applicable to somitogenesis in chick, mouse, and potentially other segmented organisms.