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Neuron. 2016 Feb 3;89(3):536-49. doi: 10.1016/j.neuron.2016.01.015.

A Transient Translaminar GABAergic Interneuron Circuit Connects Thalamocortical Recipient Layers in Neonatal Somatosensory Cortex.

Author information

1
Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford OX1 3QX, UK.
2
Department of Neurosciences, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA.
3
Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford OX1 3QX, UK. Electronic address: simon.butt@dpag.ox.ac.uk.

Abstract

GABAergic activity is thought to influence developing neocortical sensory circuits. Yet the late postnatal maturation of local layer (L)4 circuits suggests alternate sources of GABAergic control in nascent thalamocortical networks. We show that a population of L5b, somatostatin (SST)-positive interneuron receives early thalamic synaptic input and, using laser-scanning photostimulation, identify an early transient circuit between these cells and L4 spiny stellates (SSNs) that disappears by the end of the L4 critical period. Sensory perturbation disrupts the transition to a local GABAergic circuit, suggesting a link between translaminar and local control of SSNs. Conditional silencing of SST+ interneurons or conversely biasing the circuit toward local inhibition by overexpression of neuregulin-1 type 1 results in an absence of early L5b GABAergic input in mutants and delayed thalamic innervation of SSNs. These data identify a role for L5b SST+ interneurons in the control of SSNs in the early postnatal neocortex.

PMID:
26844833
PMCID:
PMC4742537
DOI:
10.1016/j.neuron.2016.01.015
[Indexed for MEDLINE]
Free PMC Article

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