Theoretical relation between axon initial segment geometry and excitability.

Abstract:

:In most vertebrate neurons, action potentials are triggered at the distal end of the axon initial segment (AIS). Both position and length of the AIS vary across and within neuron types, with activity, development and pathology. What is the impact of AIS geometry on excitability? Direct empirical assessment has proven difficult because of the many potential confounding factors. Here, we carried a principled theoretical analysis to answer this question. We provide a simple formula relating AIS geometry and sodium conductance density to the somatic voltage threshold. A distal shift of the AIS normally produces a (modest) increase in excitability, but we explain how this pattern can reverse if a hyperpolarizing current is present at the AIS, due to resistive coupling with the soma. This work provides a theoretical tool to assess the significance of structural AIS plasticity for electrical function.

journal_name

Elife

journal_title

eLife

authors

Goethals S,Brette R

doi

10.7554/eLife.53432

subject

Has Abstract

pub_date

2020-03-30 00:00:00

issn

2050-084X

pii

53432

journal_volume

9

pub_type

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