Positive feedback of G1 cyclins ensures coherent cell cycle entry.

Positive feedback of G1 cyclins ensures coherent cell cycle entry.
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DOI:
10.1038/nature07118
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发表时间:
2008-07-17
期刊:
影响因子:
64.8
通讯作者:
Cross, Frederick R.
Cross, Frederick R.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Skotheim, Jan M.;Di Talia, Stefano;Siggia, Eric D.;Cross, Frederick R.

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In budding yeast, the Start checkpoint integrates multiple internal and external signals into an all-or-none decision to enter the cell cycle. Here, we show that Start behaves like a switch due to systems-level feedback in the regulatory network. In contrast to current models proposing a linear cascade of Start activation, transcriptional positive feedback of the G1 cyclins Cln1,2 induces the near-simultaneous expression of the ~200-gene G1/S regulon. Nuclear Cln2 drives coherent regulon expression, while cytoplasmic Cln2 drives efficient budding. cln1,2-deleted cells frequently arrest as unbudded cells, incurring a large fluctuation-induced fitness penalty due to both the lack of cytoplasmic Cln2 and insufficient G1/S regulon expression. Thus, positive-feedback-amplified expression of Cln1,2 simultaneously drives robust budding and rapid, coherent regulon expression. A similar G1/S regulatory network in mammalian cells, comprised of non-orthologous genes, suggests either the conservation of regulatory architecture or convergent evolution.
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