Sonic hedgehog expression in corticofugal projection neurons directs cortical microcircuit formation.

Abstract:

VIDEO ABSTRACT:The precise connectivity of inputs and outputs is critical for cerebral cortex function; however, the cellular mechanisms that establish these connections are poorly understood. Here, we show that the secreted molecule Sonic Hedgehog (Shh) is involved in synapse formation of a specific cortical circuit. Shh is expressed in layer V corticofugal projection neurons and the Shh receptor, Brother of CDO (Boc), is expressed in local and callosal projection neurons of layer II/III that synapse onto the subcortical projection neurons. Layer V neurons of mice lacking functional Shh exhibit decreased synapses. Conversely, the loss of functional Boc leads to a reduction in the strength of synaptic connections onto layer Vb, but not layer II/III, pyramidal neurons. These results demonstrate that Shh is expressed in postsynaptic target cells while Boc is expressed in a complementary population of presynaptic input neurons, and they function to guide the formation of cortical microcircuitry.

journal_name

Neuron

journal_title

Neuron

authors

Harwell CC,Parker PR,Gee SM,Okada A,McConnell SK,Kreitzer AC,Kriegstein AR

doi

10.1016/j.neuron.2012.02.009

subject

Has Abstract

pub_date

2012-03-22 00:00:00

pages

1116-26

issue

6

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(12)00136-5

journal_volume

73

pub_type

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