Motor cortex analogue neurons in songbirds utilize Kv3 channels to generate ultranarrow spikes.
Motor cortex analogue neurons in songbirds utilize Kv3 channels to generate ultranarrow spikes.
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DOI：
10.7554/elife.81992
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发表时间：
2023-05-09
期刊：
影响因子：
7.7
通讯作者：
von Gersdorff H
中科院分区：
文献类型：
--
作者：
Zemel BM;Nevue AA;Tavares LES;Dagostin A;Lovell PV;Jin DZ;Mello CV;von Gersdorff H
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Complex motor skills in vertebrates require specialized upper motor neurons with precise action potential (AP) firing. To examine how diverse populations of upper motor neurons subserve distinct functions and the specific repertoire of ion channels involved, we conducted a thorough study of the excitability of upper motor neurons controlling somatic motor function in the zebra finch. We found that robustus arcopallialis projection neurons (RAPNs), key command neurons for song production, exhibit ultranarrow spikes and higher firing rates compared to neurons controlling non-vocal somatic motor functions (dorsal intermediate arcopallium [AId] neurons). Pharmacological and molecular data indicate that this striking difference is associated with the higher expression in RAPNs of high threshold, fast-activating voltage-gated Kv3 channels, that likely contain Kv3.1 (KCNC1) subunits. The spike waveform and Kv3.1 expression in RAPNs mirror properties of Betz cells, specialized upper motor neurons involved in fine digit control in humans and other primates but absent in rodents. Our study thus provides evidence that songbirds and primates have convergently evolved the use of Kv3.1 to ensure precise, rapid AP firing in upper motor neurons controlling fast and complex motor skills.
影响因子：
2.9
作者：
Fohlmeister JF
通讯作者：
Fohlmeister JF
影响因子：
5.3
作者：
Almog M;Barkai T;Lampert A;Korngreen A
通讯作者：
Korngreen A
影响因子：
4.4
作者：
Lovell PV;Carleton JB;Mello CV
通讯作者：
Mello CV