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Neuronal gain modulability is determined by dendritic morphology: A computational optogenetic study.

Sarah Jarvis1, Konstantin Nikolic2, Simon R Schultz1

  • 1Centre for Neurotechnology and Department of Bioengineering, Imperial College London, London, United Kingdom.

Plos Computational Biology
|March 10, 2018
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Summary

Dendrites play a crucial role in controlling neuronal gain. Specific dendritic morphologies, like bipolar branching, enhance gain modulation, impacting neural circuit function.

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Area of Science:

  • Computational neuroscience
  • Neurophysiology
  • Biophysics

Background:

  • Neuronal input-output function gain modulation is key to neural computation.
  • The specific role of dendrites in neuronal gain control remains largely unexplored.
  • Optogenetics offers new methods to study dendritic function.

Purpose of the Study:

  • To model how dendritic integration of excitatory and inhibitory inputs affects neuronal gain.
  • To investigate the impact of dendritic morphology on gain control.
  • To create an experimentally testable model incorporating opsin kinetics.

Main Methods:

  • Developed a computational model of neuronal gain control.
  • Incorporated kinetic models of opsins for experimental relevance.
  • Generated diverse dendritic geometries with constant branch numbers and areas.
  • Simulated competing excitatory and inhibitory inputs within the dendritic arbor.

Main Results:

  • Identified a relationship between dendritic morphology and gain modulability.
  • Bipolar dendritic morphology with moderate branching showed highest gain control receptivity.
  • Model confirmed on layer V pyramidal cells and stellate cells.
  • Demonstrated that full gain modulation requires innervation of all dendritic subdomains.

Conclusions:

  • Dendritic morphology significantly influences neuronal gain control.
  • Layer V pyramidal cells act as gain regulators in neural circuits.
  • Targeting dendritic subdomains is essential for effective gain modulation.
  • Soma-targeted stimulation may overlook critical functions like gain modulation.