Optogenetic silencing of neurotransmitter release with a naturally occurring invertebrate rhodopsin

Item Type:	Preprint
Title:	Optogenetic silencing of neurotransmitter release with a naturally occurring invertebrate rhodopsin
Creators Name:	Mahn, M. and Saraf-Sinik, I. and Patil, P. and Pulin, M. and Bitton, E. and Karalis, N. and Bruentgens, F. and Palgi, S. and Gat, A. and Dine, J. and Wietek, J. and Davidi, I. and Levy, R. and Litvin, A. and Zhou, F. and Sauter, K. and Soba, P. and Schmitz, D. and Luthi, A. and Rost, B.R. and Wiegert, J.S. and Yizhar, O.
Abstract:	Information is carried between brain regions through neurotransmitter release from axonal presynaptic terminals. Understanding the functional roles of defined neuronal projection pathways in cognitive and behavioral processes requires temporally precise manipulation of their activity in vivo. However, existing optogenetic tools have low efficacy and off-target effects when applied to presynaptic terminals, while chemogenetic tools are difficult to control in space and time. Here, we show that a targeting-enhanced mosquito homologue of the vertebrate encephalopsin (eOPN3) can effectively suppress synaptic transmission through the G(i/o) signaling pathway. Brief illumination of presynaptic terminals expressing eOPN3 triggers a lasting suppression of synaptic output that recovers spontaneously within minutes in vitro as well as in vivo. In freely moving mice, eOPN3-mediated suppression of dopaminergic nigrostriatal afferents leads to an ipsiversive rotational bias. We conclude that eOPN3 can be used to selectively suppress neurotransmitter release at synaptic terminals with high spatiotemporal precision, opening new avenues for functional interrogation of long-range neuronal circuits in vivo.
Keywords:	Animals, Mice
Source:	bioRxiv
Publisher:	Cold Spring Harbor Laboratory Press
Article Number:	2021.02.18.431673
Date:	18 February 2021
Official Publication:	https://doi.org/10.1101/2021.02.18.431673

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