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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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Updated: Apr 19, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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How MAP kinase modules function as robust, yet adaptable, circuits.

Tianhai Tian1, Angus Harding

  • 1a School of Mathematical Science; Monash University; Victoria, Australia.

Cell Cycle (Georgetown, Tex.)
|December 9, 2014
PubMed
Summary
This summary is machine-generated.

The conserved 3-tiered MAP kinase module evolved for robustness and adaptability. This structure facilitated phenotypic variation, driving eukaryotic evolution through positive selection.

Keywords:
MAP kinaseevolutionfacilitated variationrobustnesssignal transductionsystems biology

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Area of Science:

  • Evolutionary biology
  • Systems biology
  • Molecular biology

Background:

  • Eukaryotic diversity arises from conserved biological modules.
  • These modules require robustness and adaptability for evolution.
  • MAP kinase (MAPK) modules are conserved 3-tiered signaling systems.

Purpose of the Study:

  • Investigate the evolutionary advantage of the conserved 3-tiered MAPK module topology.
  • Understand the design principles underlying MAPK signaling evolution.

Main Methods:

  • Computational simulations were employed.
  • Analysis of a fundamental 2-tiered circuit topology.
  • Modeling reconfiguration through feedback loops and scaffolds.

Main Results:

  • A 2-tiered circuit can generate diverse outputs via reconfiguration.
  • Connecting this to input kinases creates a robust and adaptable 3-tiered module.
  • This configuration supports multiple phenotypes and stability.

Conclusions:

  • The 3-tiered MAPK module offers robustness and adaptability.
  • Positive selection likely conserved this topology for facilitating eukaryotic phenotypic variation.
  • This informs both evolutionary and synthetic biology.