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Related Experiment Video

Updated: May 14, 2026

Design, Surface Treatment, Cellular Plating, and Culturing of Modular Neuronal Networks Composed of Functionally Inter-connected Circuits
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Published on: April 15, 2015

The evolutionary origins of modularity.

Jeff Clune1, Jean-Baptiste Mouret, Hod Lipson

  • 1Cornell University, Ithaca, NY, USA. jclune@uwyo.edu

Proceedings. Biological Sciences
|February 1, 2013
PubMed
Summary
This summary is machine-generated.

Biological networks evolve modularity due to selection pressure to minimize connection costs, enhancing evolvability. This finding explains how organisms adapt and aids in evolutionary engineering.

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Area of Science:

  • Evolutionary biology
  • Systems biology
  • Network science

Background:

  • Evolvability, the capacity for rapid adaptation, is a key feature of natural organisms.
  • Biological networks exhibit widespread modularity, organized into functional, sparsely connected subunits.
  • The evolutionary origins of biological network modularity remain debated, with most hypotheses focusing on indirect selection for evolvability.

Purpose of the Study:

  • To investigate the direct selective pressures that lead to the evolution of modular biological networks.
  • To determine if minimizing connection costs directly drives modularity and enhances evolvability.
  • To provide a mechanistic explanation for the prevalence of modularity in biological systems.

Main Methods:

  • Computational evolution experiments were designed to simulate evolutionary processes.
  • Selection pressures were applied to maximize network performance and minimize the cost of connections between network nodes.
  • The modularity and evolvability of resulting networks were compared against control experiments lacking cost-selection.

Main Results:

  • Networks evolved under selection for performance and minimized connection costs exhibited significantly higher modularity.
  • These modular networks also demonstrated enhanced evolvability compared to control networks.
  • Direct selection pressure to reduce connection costs is a sufficient cause for the emergence of modularity.

Conclusions:

  • The direct cost of connections, not just indirect selection for evolvability, is a primary driver for the evolution of modular biological networks.
  • This provides a unifying explanation for modularity across diverse biological systems.
  • Findings have implications for understanding adaptation, neuroscience, genetics, and evolutionary engineering.