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Although focal cortical malformations are considered neuronal migration disorders, their formation mechanisms remain unknown. We addressed how the γ-aminobutyric acid (GABA)ergic system affects the GABAergic and glutamatergic neuronal migration underlying such malformations. A focal freeze-lesion (FFL) of the postnatal day zero (P0) glutamic acid decarboxylase–green fluorescent protein knock-in mouse neocortex produced a 3- or 4-layered microgyrus at P7. GABAergic interneurons accumulated around the necrosis including the superficial region during microgyrus formation at P4, whereas E17.5-born, Cux1-positive pyramidal neurons outlined the GABAergic neurons and were absent from the superficial layer, forming cell-dense areas in layer 2 of the P7 microgyrus. GABA imaging showed that an extracellular GABA level temporally increased in the GABAergic neuron-positive area, including the necrotic center, at P4. The expression of the Cl –  transporter  KCC2  was downregulated in the microgyrus-forming GABAergic and E17.5-born glutamatergic neurons at P4; these cells may need a high intracellular Cl –  concentration to induce depolarizing GABA effects. Bicuculline decreased the frequency of spontaneous Ca 2+  oscillations in these microgyrus-forming cells. Thus, neonatal FFL causes specific neuronal accumulation, preceded by an increase in ambient GABA during microgyrus formation. This GABA increase induces GABA A  receptor-mediated Ca 2+  oscillation in  KCC2 -downregulated microgyrus-forming cells, as seen in migrating cells during early neocortical development.

cerebral cortex

Accumulation of GABAergic Neurons, Causing a Focal Ambient GABA Gradient, and Downregulation of  KCC2  Are Induced During Microgyrus Formation in a Mouse Model of Polymicrogyria