Symmetry breaking in a bulk-surface reaction-diffusion model for signaling networks
Symmetry breaking in a bulk-surface reaction-diffusion model for signaling networks
复制标题
信号网络体表面反应扩散模型中的对称性破缺
DOI:
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
M. Roger
中科院分区:
文献类型:
--
作者:
A. Ratz;M. Roger
Signaling molecules play an important role for many cellular functions. We investigate here a general system of two membrane reaction–diffusion equations coupled to a diffusion equation inside the cell by a Robin-type boundary condition and a flux term in the membrane equations. A specific model of this form was recently proposed by the authors for the GTPase cycle in cells. We investigate here a putative role of diffusive instabilities in cell polarization. By a linearized stability analysis we identify two different mechanisms. The first resembles a classical Turing instability for the membrane subsystem and requires (unrealistically) large differences in the lateral diffusion of activator and substrate. The second possibility on the other hand is induced by the difference in cytosolic and lateral diffusion and appears much more realistic. We complement our theoretical analysis by numerical simulations that confirm the new stability mechanism and allow to investigate the evolution beyond the regime where the linearization applies.
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