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Modulation of tactile feedback for the execution of dexterous movement

James M. Conner, View ORCID ProfileAndrew Bohannon, View ORCID ProfileMasakazu Igarashi, James Taniguchi, Nicholas Baltar, View ORCID ProfileEiman Azim
doi: https://doi.org/10.1101/2021.03.04.433649
James M. Conner
1Molecular Neurobiology Laboratory, Salk Institute for Biological Studies; La Jolla, CA, USA
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Andrew Bohannon
1Molecular Neurobiology Laboratory, Salk Institute for Biological Studies; La Jolla, CA, USA
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Masakazu Igarashi
1Molecular Neurobiology Laboratory, Salk Institute for Biological Studies; La Jolla, CA, USA
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James Taniguchi
1Molecular Neurobiology Laboratory, Salk Institute for Biological Studies; La Jolla, CA, USA
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Nicholas Baltar
1Molecular Neurobiology Laboratory, Salk Institute for Biological Studies; La Jolla, CA, USA
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Eiman Azim
1Molecular Neurobiology Laboratory, Salk Institute for Biological Studies; La Jolla, CA, USA
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  • ORCID record for Eiman Azim
  • For correspondence: eazim@salk.edu
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Abstract

While dexterity relies on the constant transmission of sensory information, unchecked feedback can be disruptive to behavior. Yet how somatosensory feedback from the hands is regulated as it first enters the brain, and whether this modulation exerts any influence on movement, remain unclear. Leveraging molecular-genetic access in mice, we find that tactile afferents from the hand recruit neurons in the brainstem cuneate nucleus whose activity is modulated by distinct classes of local inhibitory neurons. Selective manipulation of these inhibitory circuits can suppress or enhance the transmission of tactile information, affecting behaviors that rely on movement of the hands. Investigating whether these local circuits are subject to top-down control, we identify distinct descending cortical pathways that innervate cuneate in a complementary pattern. Somatosensory cortical neurons target the core tactile region of cuneate, while a large rostral cortical population drives feed-forward inhibition of tactile transmission through an inhibitory shell. These findings identify a circuit basis for tactile feedback modulation, enabling the effective execution of dexterous movement.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted March 05, 2021.
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Modulation of tactile feedback for the execution of dexterous movement
James M. Conner, Andrew Bohannon, Masakazu Igarashi, James Taniguchi, Nicholas Baltar, Eiman Azim
bioRxiv 2021.03.04.433649; doi: https://doi.org/10.1101/2021.03.04.433649
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Modulation of tactile feedback for the execution of dexterous movement
James M. Conner, Andrew Bohannon, Masakazu Igarashi, James Taniguchi, Nicholas Baltar, Eiman Azim
bioRxiv 2021.03.04.433649; doi: https://doi.org/10.1101/2021.03.04.433649

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