Abstract:
:Little is known about genetic mechanisms that regulate the ratio of cortical excitatory and inhibitory neurons. We show that NPAS1 and NPAS3 transcription factors (TFs) are expressed in progenitor domains of the mouse basal ganglia (subpallium, MGE, and CGE). NPAS1(-/-) mutants had increased proliferation, ERK signaling, and expression of Arx in the MGE and CGE. NPAS1(-/-) mutants also had increased neocortical inhibition (sIPSC and mIPSC) and generated an excess of somatostatin(+) (SST) (MGE-derived) and vasoactive intestinal polypeptide(+) (VIP) (CGE-derived) neocortical interneurons, but had a normal density of parvalbumin(+) (PV) (MGE-derived) interneurons. In contrast, NPAS3(-/-) mutants showed decreased proliferation and ERK signaling in progenitors of the ganglionic eminences and had fewer SST(+) and VIP(+) interneurons. NPAS1 repressed activity of an Arx enhancer, and Arx overexpression resulted in increased proliferation of CGE progenitors. These results provide insights into genetic regulation of cortical interneuron numbers and cortical inhibitory tone.
journal_name
Neuronjournal_title
Neuronauthors
Stanco A,Pla R,Vogt D,Chen Y,Mandal S,Walker J,Hunt RF,Lindtner S,Erdman CA,Pieper AA,Hamilton SP,Xu D,Baraban SC,Rubenstein JLdoi
10.1016/j.neuron.2014.10.040subject
Has Abstractpub_date
2014-12-03 00:00:00pages
940-53issue
5eissn
0896-6273issn
1097-4199pii
S0896-6273(14)00960-Xjournal_volume
84pub_type
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