Patch Coalescence as a Mechanism for Eukaryotic Directional Sensing
Abstract
Eukaryotic cells possess a sensible chemical compass allowing them to orient toward sources of soluble chemicals. The extracellular chemical signal triggers separation of the cell membrane into two domains populated by different phospholipid molecules and oriented along the signal anisotropy. We propose a theory of this polarization process, which is articulated into subsequent stages of germ nucleation, patch coarsening, and merging into a single domain. We find that the polarization time, tγ, depends on the anisotropy degree γ through the power law tγ∝γ-2, and that in a cell of radius R there should exist a threshold value γth∝R-1 for the smallest detectable anisotropy.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2007
- DOI:
- 10.1103/PhysRevLett.99.158101
- arXiv:
- arXiv:0810.5409
- Bibcode:
- 2007PhRvL..99o8101G
- Keywords:
-
- 87.17.Jj;
- 64.60.My;
- 64.60.Qb;
- 87.16.Xa;
- Cell locomotion;
- chemotaxis and related directed motion;
- Metastable phases;
- Nucleation;
- Signal transduction;
- Condensed Matter - Statistical Mechanics;
- Physics - Biological Physics;
- Quantitative Biology - Cell Behavior
- E-Print:
- Phys. Rev. Lett. 99 (2007) 158101