Astrocytes close a motor circuit critical period.
Astrocytes close a motor circuit critical period.
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DOI:
10.1038/s41586-021-03441-2
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发表时间:
2021-04
期刊:
影响因子:
64.8
通讯作者:
中科院分区:
文献类型:
--
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Critical periods – brief intervals where neural circuits can be modified by activity – are necessary for proper neural circuit assembly. Extended critical periods are associated with neurodevelopmental disorders; however, the mechanisms that ensure timely critical period closure remain poorly understood . Here, we define a critical period in a developing Drosophila motor circuit, and identify astrocytes as essential for proper critical period termination. During the critical period, motor neurons scale dendrite length, complexity, and connectivity in response to changes in activity. Astrocytes invaded the neuropil just prior to critical period closure, and astrocyte ablation prolonged the critical period. Finally, we used a genetic screen to identify astrocyte-motor neuron signaling pathways that close the critical period, including Neuroligin-Neurexin signaling. Reduced signaling destabilized dendritic microtubules, increased dendrite dynamicity, and impaired locomotor behavior, underscoring the importance of critical period closure. Previous work defined astroglia as regulators of plasticity at individual synapses; here, we show that astrocytes also regulate critical period closure to ensure proper locomotor behavior.
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