Cell-Size Confinement Drives Size-Dependent Scaling of Intracellular Reaction-Diffusion Waves for Robust Patterning

Area of Science:

• Cell biology
• Biophysics
• Biochemistry

Background:

• Intracellular reaction-diffusion (iRD) waves are vital for molecular positioning within cells.
• Cellular constraints like spatial confinement and surface-bulk coupling complicate understanding iRD wave physics.
• The physical characteristics of iRD waves in cells remain largely elusive.

Purpose of the Study:

• To investigate the physical characteristics of iRD waves under cellular constraints.
• To elucidate the mechanism of wavelength selection in iRD waves within confined cellular environments.
• To understand how iRD waves adapt to spatial sizes for biological function.

Main Methods:

• An artificial cell experiment using defined factors to replicate the Min wave (an iRD wave) for cell division.
• Systematic variation of spatial confinement in the artificial cell system.
• Theoretical analysis using the established Min wave model.

Main Results:

• Demonstrated that the wavelength of iRD waves is selected by the surrounding space size.
• Showed that wavelength selection adjusts wave shape and speed to match spatial dimensions.
• Confirmed the robustness of macroscopic iRD wave patterns against physicochemical perturbations.

Conclusions:

• The space size directly selects the wavelength of intracellular reaction-diffusion waves.
• This size-dependent adaptation confers robustness to molecular positioning mechanisms in cells.
• The findings suggest a general principle for how cells utilize reaction-diffusion waves for diverse molecular placement functions.