A specialized spinal circuit for command amplification and directionality during escape behavior
A specialized spinal circuit for command amplification and directionality during escape behavior
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DOI：
10.1073/pnas.2106785118
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Jianren Song
中科院分区：
文献类型：
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作者：
Na Guan;Lulu Xu;Tianrui Zhang;Chun-Xiao Huang;Zhen Wang;Elin Dahlberg;Haoyu Wang;Fangfang Wang;Irene Pallucchi;Yunfeng Hua;Abdeljabbar El Manira;Jianren Song
In vertebrates, action selection often involves higher cognition entailing an evaluative process. However, urgent tasks, such as defensive escape, require an immediate implementation of the directionality of escape trajectory, necessitating local circuits. Here we reveal a specialized spinal circuit for the execution of escape direction in adult zebrafish. A central component of this circuit is a unique class of segmentally repeating cholinergic V2a interneurons expressing the transcription factor Chx10. These interneurons amplify brainstem-initiated escape commands and rapidly deliver the excitation via a feedforward circuit to all fast motor neurons and commissural interneurons to direct the escape maneuver. The information transfer within this circuit relies on fast and reliable axo-axonic synaptic connections, bypassing soma and dendrites. Unilateral ablation of cholinergic V2a interneurons eliminated escape command propagation. Thus, in vertebrates, local spinal circuits can implement directionality of urgent motor actions vital for survival.
