How Cortical Interneurons Develop: Current and Future Research
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Inhibitory gamma-aminobutyric acid-containing (GABAergic) interneurons may comprise only around 20% of all cortical neurons, but they play important roles in cortical function. Not only do they control and orchestrate the activity of excitatory glutamatergic pyramidal cells of the neocortex, contributing to regulation of the overall activity levels of the brain, but they also mediate the precise processing of information in the different cortical networks.
Their importance is further manifested by increasing evidence that implicates them in brain disorders such as schizophrenia and epilepsy, as well as autism spectrum disorders.
Cortical GABAergic interneurons are highly heterogeneous, forming distinct functional classes with unique molecular, morphological, and electrophysiological characteristics. Recent transcriptomic analysis reveals that 20 molecularly distinct interneuron types exist in the mammalian neocortex. This remarkable heterogeneity is the outcome of a long developmental journey.
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![The journey of cortical interneurons: (A) Cortical interneurons are born in the ganglionic eminence of the basal forebrain, and (B) migrate to reach the dorsal cortex. (C) Their number is determined upon programmed cell death and strongly depends on neuronal activity. (D) Wiring [dendritic and axonal morphogenesis and synapse establishment (1)], myelination (2) and circuit refinement of Martinotti, Basket, Chandelier and all other interneuron types is established within the first month after birth. This cartoon has been designed and drawn by Yannis Maragkos, Denaxa Lab, BSRC Al. Fleming.](https://neuronline.sfn.org/-/media/Project/Neuronline/Article-Images/Scientific-Research/2020/How-Cortical-Interneurons-Develop.jpg)




