Primary Cilia Signaling Shapes the Development of Interneuronal Connectivity

Dev Cell. 2017 Aug 7;42(3):286-300.e4. doi: 10.1016/j.devcel.2017.07.010.

Abstract

Appropriate growth and synaptic integration of GABAergic inhibitory interneurons are essential for functional neural circuits in the brain. Here, we demonstrate that disruption of primary cilia function following the selective loss of ciliary GTPase Arl13b in interneurons impairs interneuronal morphology and synaptic connectivity, leading to altered excitatory/inhibitory activity balance. The altered morphology and connectivity of cilia mutant interneurons and the functional deficits are rescued by either chemogenetic activation of ciliary G-protein-coupled receptor (GPCR) signaling or the selective induction of Sstr3, a ciliary GPCR, in Arl13b-deficient cilia. Our results thus define a specific requirement for primary cilia-mediated GPCR signaling in interneuronal connectivity and inhibitory circuit formation.

Keywords: Arl13b; GPCR signaling; Joubert syndrome related disorders; autism spectrum disorders; ciliopathies; circuitry; interneurons; primary cilia.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • ADP-Ribosylation Factors / genetics
  • ADP-Ribosylation Factors / metabolism
  • Animals
  • Cells, Cultured
  • Cilia / metabolism
  • Interneurons / cytology
  • Interneurons / metabolism*
  • Interneurons / physiology
  • Mice
  • Neurogenesis
  • Receptors, Somatostatin / genetics
  • Receptors, Somatostatin / metabolism
  • Signal Transduction*
  • Synapses / metabolism*
  • Synapses / physiology
  • Synaptic Potentials*

Substances

  • Arl13b protein, mouse
  • Receptors, Somatostatin
  • somatostatin receptor 3
  • ADP-Ribosylation Factors