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Cross-talk and decision making in MAP kinase pathways

A Corrigendum to this article was published on 01 April 2007

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Abstract

Cells must respond specifically to different environmental stimuli in order to survive. The signal transduction pathways involved in sensing these stimuli often share the same or homologous proteins. Despite potential cross-wiring, cells show specificity of response. We show, through modeling, that the physiological response of such pathways exposed to simultaneous and temporally ordered inputs can demonstrate system-level mechanisms by which pathways achieve specificity. We apply these results to the hyperosmolar and pheromone mitogen-activated protein (MAP) kinase pathways in the yeast Saccharomyces cerevisiae. These two pathways specifically sense osmolar and pheromone signals1,2,3, despite sharing a MAPKKK, Ste11, and having homologous MAPKs (Fus3 and Hog1). We show that in a single cell, the pathways are bistable over a range of inputs, and the cell responds to only one stimulus even when exposed to both. Our results imply that these pathways achieve specificity by filtering out spurious cross-talk through mutual inhibition. The variability between cells allows for heterogeneity of the decisions.

NOTE: In the version of this article initially published,the strain referred to as FUS3D63S on pp.411-412 of the main text and in the figure legend for Figure 5c-f should instead read 5c-f should instead read 5c-f FUS3D317G.The error has been corrected in the PDF version of the article.

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Figure 1: Different mechanisms for achieving specificity of two parallel signaling pathways yield different responses after exposure to both signals.
Figure 2: Pheromone and high-osmolarity pathways.
Figure 3: Cells costimulated with sorbitol and pheromone show mutually exclusive activation of the pheromone and the high-osmolarity response pathways.
Figure 4: Cells show history dependence in their response to pheromone.
Figure 5: Switch-like signaling behavior depends on pathway cross-inhibition.

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  • 14 March 2007

    NOTE: In the version of this article initially published,the strain referred to as FUS3D63S on pp.411-412 of the main text and in the figure legend for Figure 5c-f should instead read 5c-f should instead read 5c-f FUS3D317G.The error has been corrected in the PDF version of the article.

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Acknowledgements

We thank J. Weiner, P. Houston, K. Thorn, K. Duevel, L. Schneper, E. Xu and P. Hersen for help with experiments, R. Tsien and E. Winters for reagents, A. Sengupta, A. Murray and M. Tyers for helpful discussions and A. Regev, L. Garwin, K. Vestrepen, P. Swain, E. O'Shea, I. Nachman, N. Barkai and A. Amon for comments on the manuscript. This work was supported by grants from the NIH (J.R.B.), GRPW fellowship, Lucent Technologies (M.N.M.), Keck Futures Initiative (S.R.) and the FAS Center for Systems Biology (S.R. and M.N.M.). Requests for materials should be addressed to S.R. (sharadr@alcatel-lucent.com).

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Authors and Affiliations

Authors

Contributions

S.R., J.R.B. and M.M. designed the experiments; M.M. and A.M. did the modeling and J.R.B., M.M., A.M. and S.R. wrote the paper.

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Correspondence to Sharad Ramanathan.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Fig. 1

The analysis of models. (PDF 887 kb)

Supplementary Fig. 2

Results from modeling. (PDF 525 kb)

Supplementary Fig. 3

Cell-to-cell variability. (PDF 732 kb)

Supplementary Fig. 4

Controls. (PDF 220 kb)

Supplementary Fig. 5

Protein blots. (PDF 290 kb)

Supplementary Fig. 6

Filamentous growth and pheromone response pathways and model. (PDF 494 kb)

Supplementary Fig. 7

Phase plot of pheromone and filamentous response as a function of the inputs. (PDF 384 kb)

Supplementary Methods (PDF 880 kb)

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McClean, M., Mody, A., Broach, J. et al. Cross-talk and decision making in MAP kinase pathways. Nat Genet 39, 409–414 (2007). https://doi.org/10.1038/ng1957

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