Abstract
Neurons are highly polarized cells with extensive axonal and dendritic projections that send and receive signals over long distances. Neuronal polarity requires sorting and maintaining a unique set of proteins to the neuron's distinct axonal and somatodendritic domains. The axon initial segment (AIS) is a specialized subcellular region located between these two domains and is critical for neuronal polarity. The AIS has a complex and elaborately organized molecular structure that enables its functions in neuronal polarity. Disruption of the AIS is associated with neurodevelopmental and neuropsychiatric disease pathologies, thus highlighting the importance of the AIS in neuronal physiology. This review discusses recent progress toward understanding the molecular architecture of the AIS and its importance in neuronal polarity through regulating protein diffusion and vesicular trafficking.
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