A size principle for recruitment of Drosophila leg motor neurons
| Autor: | John C. Tuthill, Anthony W. Azevedo, Evyn S. Dickinson, Richard S. Mann, Lalanti Venkatasubramanian, Pralaksha Gurung |
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| Přispěvatelé: | Azevedo, Anthony W [0000-0001-8318-9678], Dickinson, Evyn S [0000-0001-7518-9512], Venkatasubramanian, Lalanti [0000-0002-9280-8335], Mann, Richard S [0000-0002-4749-2765], Tuthill, John C [0000-0002-5689-5806], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
muscle QH301-705.5 proprioception Science General Biochemistry Genetics and Molecular Biology neuroscience 03 medical and health sciences 0302 clinical medicine Calcium imaging Motor system medicine motor control Animals Biology (General) motor neuron Drosophila Motor Neurons General Immunology and Microbiology biology Proprioception D. melanogaster Tibia Electromyography General Neuroscience Work (physics) Motor control General Medicine Motor neuron biology.organism_classification Biomechanical Phenomena Electrophysiology 030104 developmental biology medicine.anatomical_structure nervous system Medicine Neuroscience 030217 neurology & neurosurgery |
| Zdroj: | eLife, Vol 9 (2020) |
| Popis: | To move the body, the brain must precisely coordinate patterns of activity among diverse populations of motor neurons. Here, we use in vivo calcium imaging, electrophysiology, and behavior to understand how genetically-identified motor neurons control flexion of the fruit fly tibia. We find that leg motor neurons exhibit a coordinated gradient of anatomical, physiological, and functional properties. Large, fast motor neurons control high force, ballistic movements while small, slow motor neurons control low force, postural movements. Intermediate neurons fall between these two extremes. This hierarchical organization resembles the size principle, first proposed as a mechanism for establishing recruitment order among vertebrate motor neurons. Recordings in behaving flies confirmed that motor neurons are typically recruited in order from slow to fast. However, we also find that fast, intermediate, and slow motor neurons receive distinct proprioceptive feedback signals, suggesting that the size principle is not the only mechanism that dictates motor neuron recruitment. Overall, this work reveals the functional organization of the fly leg motor system and establishes Drosophila as a tractable system for investigating neural mechanisms of limb motor control. |
| Databáze: | OpenAIRE |
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