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Layer 1 NDNF+ interneurons control bilateral sensory processing in a layer-dependent manner

Karayannis, T.; Vighagen, R.; Gesuita, L.; Damilou, A.; Cavaccini, A.; Banterle, L.; Steenhuis, V.

2021-12-03 neuroscience
10.1101/2021.12.02.470902 bioRxiv
Show abstract

Bilateral sensory information is indispensable for navigating the world. In most mammals, signals sensed by either side of the midline will ultimately reach the cortex where they will be integrated for perception and appropriate action selection. Even though information transferred across the hemispheres is routed through the corpus callosum, how and which microcircuits are key in integrating it is not well understood. Here we identify an essential role for layer 1 NDNF+ inhibitory cells of mice in integrating bilateral whisker-evoked information in an NMDA receptor-dependent manner. Direct connections from the contralateral cortex and the ipsilateral side activate NDNF+ neurons, which subsequently inhibit the late spiking activity of underlying layer 2/3 neurons, but not layer 5. Our results identify a feed-forward regulatory pathway for bilateral cortical sensory processing of upper layer cortical neurons actuated via layer 1 NDNF+ interneurons.

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