Tracking shallow chemical gradients by actin-driven wandering of the polarization site.

Tracking shallow chemical gradients by actin-driven wandering of the polarization site.
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DOI:
10.1016/j.cub.2012.11.014
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发表时间:
2013-01-07
期刊:
影响因子:
9.2
通讯作者:
Lew, Daniel J.
Lew, Daniel J.
中科院分区:
生物学1区
文献类型:
--
作者:
Dyer, Jayme M.;Savage, Natasha S.;Jin, Meng;Zyla, Trevin R.;Elston, Timothy C.;Lew, Daniel J.

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Many cells are remarkably proficient at tracking very shallow chemical gradients, despite considerable noise from stochastic receptor-ligand interactions. Motile cells appear to undergo a biased random walk: spatial noise in receptor activity may determine the instantaneous direction, but because noise is spatially unbiased it is filtered out by time-averaging, resulting in net movement up-gradient. How non-motile cells might filter out noise is unknown. Using yeast chemotropic mating as a model, we demonstrate that a polarized patch of polarity regulators “wanders” along the cortex during gradient tracking. Computational and experimental findings suggest that actin-directed membrane traffic contributes to wandering by diluting local polarity factors. The pheromone gradient appears to bias wandering via interactions between receptor-activated Gβγ and polarity regulators. Artificially blocking patch wandering impairs gradient tracking. We suggest that the polarity patch undergoes an intracellular biased random walk that enables noise filtering by time-averaging, allowing non-motile cells to track shallow gradients.
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