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The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
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How the Structure of Signaling Regulation Evolves: Insights from an Evolutionary Model.

Danial Asgari1,2, Ann T Tate1,2

  • 1Department of Biological Sciences, Vanderbilt University, Nashville TN 37232.

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|November 1, 2024
PubMed
Summary
This summary is machine-generated.

Negative feedback loops (NFLs) in cell signaling evolve differently based on their position. Downstream NFLs evolve more robustly than upstream NFLs, influencing immune pathway regulation.

Keywords:
Negative feedbackdownstream regulationmulti-level regulationupstream regulation

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Area of Science:

  • Evolutionary biology
  • Systems biology
  • Molecular biology

Background:

  • Signaling pathways use negative feedback loops (NFLs) to regulate cellular responses to environmental changes.
  • NFLs can function upstream (reducing input) or downstream (reducing output) of signaling cascades.
  • Downstream NFLs directly regulate gene expression, unlike upstream NFLs which involve intermediate proteins.

Purpose of the Study:

  • To test the hypothesis that downstream NFLs evolve under more stringent selection than upstream NFLs.
  • To investigate the evolutionary pressures shaping NFLs within immune signaling pathways.
  • To understand how signaling costs and environmental factors influence NFL evolution.

Main Methods:

  • Developed a minimal model of immune signaling incorporating negative feedback loops.
  • Analyzed evolutionary rates of genes encoding upstream and downstream NFLs.
  • Simulated model behavior under varying parameters like signaling cost and protein half-life.

Main Results:

  • Genes encoding downstream NFLs exhibit slower evolutionary rates, supporting more stringent selection.
  • The model predicts robust evolution of downstream NFLs across parameter changes.
  • Upstream NFL evolution is favored by shorter signaling protein half-lives and high infection rates, but not necessarily high signaling costs.

Conclusions:

  • Downstream NFLs are robustly evolved regulatory mechanisms in signaling pathways.
  • The evolution of upstream NFLs is sensitive to factors like protein stability and host-pathogen dynamics.
  • Understanding NFL evolution provides insights into the regulation of biological systems and their adaptation to environmental changes.