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Presynaptic inhibition of spinal sensory feedback ensures smooth movement.

ABSTRACT: The precision of skilled movement depends on sensory feedback and its refinement by local inhibitory microcircuits. One specialized set of spinal GABAergic interneurons forms axo-axonic contacts with the central terminals of sensory afferents, exerting presynaptic inhibitory control over sensory-motor transmission. The inability to achieve selective access to the GABAergic neurons responsible for this unorthodox inhibitory mechanism has left unresolved the contribution of presynaptic inhibition to motor behaviour. We used Gad2 as a genetic entry point to manipulate the interneurons that contact sensory terminals, and show that activation of these interneurons in mice elicits the defining physiological characteristics of presynaptic inhibition. Selective genetic ablation of Gad2-expressing interneurons severely perturbs goal-directed reaching movements, uncovering a pronounced and stereotypic forelimb motor oscillation, the core features of which are captured by modelling the consequences of sensory feedback at high gain. Our findings define the neural substrate of a genetically hardwired gain control system crucial for the smooth execution of movement.

SUBMITTER: Fink AJ

PROVIDER: S-EPMC4292914 | biostudies-literature | 2014 May

REPOSITORIES: biostudies-literature

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Presynaptic inhibition of spinal sensory feedback ensures smooth movement.

Fink Andrew J P AJ Croce Katherine R KR Huang Z Josh ZJ Abbott L F LF Jessell Thomas M TM Azim Eiman E

Nature 20140501 7498

The precision of skilled movement depends on sensory feedback and its refinement by local inhibitory microcircuits. One specialized set of spinal GABAergic interneurons forms axo-axonic contacts with the central terminals of sensory afferents, exerting presynaptic inhibitory control over sensory-motor transmission. The inability to achieve selective access to the GABAergic neurons responsible for this unorthodox inhibitory mechanism has left unresolved the contribution of presynaptic inhibition ...[more]

PMID: 24784215

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Presynaptic inhibition of spinal sensory feedback ensures smooth movement.

Publications

Presynaptic inhibition of spinal sensory feedback ensures smooth movement.

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