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Bifurcation-based approach reveals synergism and optimal combinatorial perturbation

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Abstract

Cells accomplish the process of fate decisions and form terminal lineages through a series of binary choices in which cells switch stable states from one branch to another as the interacting strengths of regulatory factors continuously vary. Various combinatorial effects may occur because almost all regulatory processes are managed in a combinatorial fashion. Combinatorial regulation is crucial for cell fate decisions because it may effectively integrate many different signaling pathways to meet the higher regulation demand during cell development. However, whether the contribution of combinatorial regulation to the state transition is better than that of a single one and if so, what the optimal combination strategy is, seem to be significant issue from the point of view of both biology and mathematics. Using the approaches of combinatorial perturbations and bifurcation analysis, we provide a general framework for the quantitative analysis of synergism in molecular networks. Different from the known methods, the bifurcation-based approach depends only on stable state responses to stimuli because the state transition induced by combinatorial perturbations occurs between stable states. More importantly, an optimal combinatorial perturbation strategy can be determined by investigating the relationship between the bifurcation curve of a synergistic perturbation pair and the level set of a specific objective function. The approach is applied to two models, i.e., a theoretical multistable decision model and a biologically realistic CREB model, to show its validity, although the approach holds for a general class of biological systems.

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Acknowledgments

The authors would like to thank the anonymous reviewers for their valuable comments and suggestions. This research is supported by the National Natural Science Foundation of China (No. 11171206).

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Authors and Affiliations

  1. Department of Mathematics, Shanghai University, Shanghai, China

    Yanwei Liu, Shanshan Li, Zengrong Liu & Ruiqi Wang

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  1. Yanwei Liu
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  3. Zengrong Liu
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Correspondence to Ruiqi Wang.

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Liu, Y., Li, S., Liu, Z. et al. Bifurcation-based approach reveals synergism and optimal combinatorial perturbation. J Biol Phys 42, 399–414 (2016). https://doi.org/10.1007/s10867-016-9414-7

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  • DOI: https://doi.org/10.1007/s10867-016-9414-7

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