AP2A2 (Adaptor-Related Protein Complex 2 Alpha 2 Subunit) is a crucial part of the AP-2 adaptor complex, which is vital for clathrin-mediated endocytosis. This process is essential for the uptake of receptors and proteins into cells, affecting cell signalling and nutrient absorption. Dysregulation of AP2A2 can influence neuronal development and synaptic function, potentially linking to neurological disorders.