Abstract:
:The neonatal mammal faces an array of sensory stimuli when diverse neuronal types have yet to form sensory maps. How these inputs interact with intrinsic neuronal activity to facilitate circuit assembly is not well understood. By using longitudinal calcium imaging in unanesthetized mouse pups, we show that layer I (LI) interneurons, delineated by co-expression of the 5HT3a serotonin receptor (5HT3aR) and reelin (Re), display spontaneous calcium transients with the highest degree of synchrony among cell types present in the superficial barrel cortex at postnatal day 6 (P6). 5HT3aR Re interneurons are activated by whisker stimulation during this period, and sensory deprivation induces decorrelation of their activity. Moreover, attenuation of thalamic inputs through knockdown of NMDA receptors (NMDARs) in these interneurons results in expansion of whisker responses, aberrant barrel map formation, and deficits in whisker-dependent behavior. These results indicate that recruitment of specific interneuron types during development is critical for adult somatosensory function. VIDEO ABSTRACT.
journal_name
Neuronjournal_title
Neuronauthors
Che A,Babij R,Iannone AF,Fetcho RN,Ferrer M,Liston C,Fishell G,De Marco García NVdoi
10.1016/j.neuron.2018.06.002subject
Has Abstractpub_date
2018-07-11 00:00:00pages
98-116.e7issue
1eissn
0896-6273issn
1097-4199pii
S0896-6273(18)30470-7journal_volume
99pub_type
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