Assemblies of Perisomatic GABAergic Neurons in the Developing Barrel Cortex.

Area of Science:

• Neuroscience
• Developmental Biology
• Computational Neuroscience

Background:

• Cortical interneurons (GABAergic neurons) play a critical role in brain development and function.
• Their activity-dependent development is crucial for sensory experience and network integration.
• The collective dynamics of GABAergic neurons during the neonatal period remain largely unknown.

Purpose of the Study:

• To investigate the coordinated activity and population dynamics of GABAergic neurons in the developing mouse barrel cortex.
• To understand the transient structures in GABAergic neuronal activity during early postnatal development.

Main Methods:

• In vivo calcium imaging in neonatal mice.
• Analysis of coordinated activity in GABAergic cell populations within the barrel cortex.

Main Results:

• A transient structure in GABAergic population dynamics was identified.
• This structure is sensory-dependent and disappears over time.
• The structure is built from anatomically clustered GABAergic assemblies, primarily of prospective parvalbumin-expressing cells.
• These assemblies expand their territories to form a uniform perisomatic GABAergic network.

Conclusions:

• Transient patterning of GABAergic activity serves as a functional scaffold linking the cortex to the external world.
• This developmental pattern precedes active sensory exploration.
• Understanding these dynamics is key to comprehending sensory integration and cortical network formation.