Beyond symmetry-breaking: competition and negative feedback in GTPase regulation.
Beyond symmetry-breaking: competition and negative feedback in GTPase regulation.
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DOI:
10.1016/j.tcb.2013.05.003
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发表时间:
2013-10
影响因子:
19
通讯作者:
Lew, Daniel J.
中科院分区:
文献类型:
--
作者:
Wu, Chi-Fang;Lew, Daniel J.
Cortical domains are often specified by the local accumulation of active GTPases. Such domains can arise through spontaneous symmetry breaking, suggesting that GTPase accumulation occurs via positive feedback. Here, we focus on recent advances in fungal and plant cell models, where new work suggests that polarity-controlling GTPases develop only one “front” because GTPase clusters engage in a winner-takes-all competition. However, in some circumstances two or more GTPase domains can co-exist, and the basis for the switch from competition to coexistence remains an open question. Polarity GTPases can undergo oscillatory clustering and dispersal, suggesting that these systems contain negative feedback. Negative feedback may prevent polarity clusters from spreading too far, regulate the balance between competition and co-existence, and provide directional flexibility for cells tracking gradients.
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