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High and asymmetric somato-dendritic coupling of V1 layer 5 neurons independent of visual stimulation and locomotion

Valerio Francioni, Zahid Padamsey, View ORCID ProfileNathalie L. Rochefort
doi: https://doi.org/10.1101/664177
Valerio Francioni
1Centre for Discovery Brain Sciences, School of Biomedical Sciences Edinburgh, Edinburgh, EH8 9XD, United Kingdom
2Simons Initiative for the Developing Brain, University of Edinburgh, Edinburgh, EH8 9XD, United Kingdom
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Zahid Padamsey
1Centre for Discovery Brain Sciences, School of Biomedical Sciences Edinburgh, Edinburgh, EH8 9XD, United Kingdom
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Nathalie L. Rochefort
1Centre for Discovery Brain Sciences, School of Biomedical Sciences Edinburgh, Edinburgh, EH8 9XD, United Kingdom
2Simons Initiative for the Developing Brain, University of Edinburgh, Edinburgh, EH8 9XD, United Kingdom
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  • ORCID record for Nathalie L. Rochefort
  • For correspondence: n.rochefort@ed.ac.uk
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Abstract

Active dendrites impact sensory processing and behaviour. However, it remains unclear how active dendritic integration relates to somatic output in vivo. We imaged semi-simultaneously GCaMP6s signals in the soma, trunk and distal tuft dendrites of layer 5 pyramidal neurons in the awake mouse primary visual cortex. We found that apical tuft signals were dominated by widespread, highly correlated calcium transients throughout the tuft. While these signals were highly coupled to trunk and somatic transients, the frequency of calcium transients was found to decrease in a distance-dependent manner from soma to tuft. Ex vivo recordings suggest that low-frequency back-propagating action potentials underlie the distance-dependent loss of signals, while coupled somato-dendritic signals can be triggered by high-frequency somatic bursts or strong apical tuft depolarization. Visual stimulation and locomotion increased neuronal activity without affecting somato-dendritic coupling. High, asymmetric somato-dendritic coupling is therefore a widespread feature of layer 5 neurons activity in vivo.

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Posted November 01, 2019.
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High and asymmetric somato-dendritic coupling of V1 layer 5 neurons independent of visual stimulation and locomotion
Valerio Francioni, Zahid Padamsey, Nathalie L. Rochefort
bioRxiv 664177; doi: https://doi.org/10.1101/664177
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High and asymmetric somato-dendritic coupling of V1 layer 5 neurons independent of visual stimulation and locomotion
Valerio Francioni, Zahid Padamsey, Nathalie L. Rochefort
bioRxiv 664177; doi: https://doi.org/10.1101/664177

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