A functional map for diverse forelimb actions within brainstem circuitry

Ruder, Ludwig and Schina, Riccardo and Kanodia, Harsh and Valencia-Garcia, Sara and Pivetta, Chiara and Arber, Silvia. (2021) A functional map for diverse forelimb actions within brainstem circuitry. Nature, 590 (7846). pp. 445-450.

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Official URL: https://edoc.unibas.ch/80482/

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The brainstem is a key centre in the control of body movements. Although the precise nature of brainstem cell types and circuits that are central to full-body locomotion are becoming known; 1-5; , efforts to understand the neuronal underpinnings of skilled forelimb movements have focused predominantly on supra-brainstem centres and the spinal cord; 6-12; . Here we define the logic of a functional map for skilled forelimb movements within the lateral rostral medulla (latRM) of the brainstem. Using in vivo electrophysiology in freely moving mice, we reveal a neuronal code with tuning of latRM populations to distinct forelimb actions. These include reaching and food handling, both of which are impaired by perturbation of excitatory latRM neurons. Through the combinatorial use of genetics and viral tracing, we demonstrate that excitatory latRM neurons segregate into distinct populations by axonal target, and act through the differential recruitment of intra-brainstem and spinal circuits. Investigating the behavioural potential of projection-stratified latRM populations, we find that the optogenetic stimulation of these populations can elicit diverse forelimb movements, with each behaviour stably expressed by individual mice. In summary, projection-stratified brainstem populations encode action phases and together serve as putative building blocks for regulating key features of complex forelimb movements, identifying substrates of the brainstem for skilled forelimb behaviours.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Neurobiology > Cell Biology (Arber)
09 Associated Institutions > Friedrich Miescher Institut FMI
UniBasel Contributors:Arber, Silvia and Schina, Riccardo and Kanodia, Harsh and Pivetta, Chiara
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Research
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:25 Mar 2022 12:31
Deposited On:31 Aug 2021 13:52

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