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Interlinked Fast and Slow Positive Feedback Loops Drive Reliable Cell Decisions
Onn Brandman,1,2*
James E. Ferrell, Jr.,1
Rong Li,2,3,4
Tobias Meyer1,2
Abstract:
Positive feedback is a ubiquitous signal transduction motifthat allows systems to convert graded inputs into decisive,all-or-none outputs. Here we investigate why the positive feedbackswitches that regulate polarization of budding yeast, calciumsignaling, Xenopus oocyte maturation, and various other processesuse multiple interlinked loops rather than single positive feedbackloops. Mathematical simulations revealed that linking fast andslow positive feedback loops creates a "dual-time" switch thatis both rapidly inducible and resistant to noise in the upstreamsignaling system.
1 Department of Molecular Pharmacology, Stanford University School of Medicine, Stanford, CA, 94305, USA. 2 Physiology Course 2004, Marine Biological Laboratory, Woods Hole, MA 02543, USA. 3 Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA. 4 The Stowers Institute for Medical Research, Kansas City, MO 64110, USA.
* To whom correspondence should be addressed. E-mail: onn{at}stanford.edu
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