Nature Communications (Jul 2023)

Synaptotagmin-1-dependent phasic axonal dopamine release is dispensable for basic motor behaviors in mice

  • Benoît Delignat-Lavaud,
  • Jana Kano,
  • Charles Ducrot,
  • Ian Massé,
  • Sriparna Mukherjee,
  • Nicolas Giguère,
  • Luc Moquin,
  • Catherine Lévesque,
  • Samuel Burke,
  • Raphaëlle Denis,
  • Marie-Josée Bourque,
  • Alex Tchung,
  • Pedro Rosa-Neto,
  • Daniel Lévesque,
  • Louis De Beaumont,
  • Louis-Éric Trudeau

DOI
https://doi.org/10.1038/s41467-023-39805-7
Journal volume & issue
Vol. 14, no. 1
pp. 1 – 24

Abstract

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Abstract In Parkinson’s disease (PD), motor dysfunctions only become apparent after extensive loss of DA innervation. This resilience has been hypothesized to be due to the ability of many motor behaviors to be sustained through a diffuse basal tone of DA; but experimental evidence for this is limited. Here we show that conditional deletion of the calcium sensor synaptotagmin-1 (Syt1) in DA neurons (Syt1 cKODA mice) abrogates most activity-dependent axonal DA release in the striatum and mesencephalon, leaving somatodendritic (STD) DA release intact. Strikingly, Syt1 cKODA mice showed intact performance in multiple unconditioned DA-dependent motor tasks and even in a task evaluating conditioned motivation for food. Considering that basal extracellular DA levels in the striatum were unchanged, our findings suggest that activity-dependent DA release is dispensable for such tasks and that they can be sustained by a basal tone of extracellular DA. Taken together, our findings reveal the striking resilience of DA-dependent motor functions in the context of a near-abolition of phasic DA release, shedding new light on why extensive loss of DA innervation is required to reveal motor dysfunctions in PD.