Aagab, also known as alpha-and gamma-adaptin-binding protein (p34), is an assembly chaperone with crucial functions in intracellular membrane trafficking. It plays a key role in regulating the assembly of AP1 and AP2 clathrin adaptors, which are involved in clathrin-mediated transport between the trans-Golgi network and the endosome, as well as clathrin-mediated endocytosis [1,2]. Genetic models, such as zebrafish mutants, have been valuable in studying Aagab's functions.

In zebrafish, aagab loss-of-function mutants show impaired swimming and early larval mortality. The mutants display subdued calcium responses and local field potential in optic tectal neurons, along with reduced neurotransmitter release. Overexpressing aagab mRNA or nervous stimulant treatment in mutants can restore normal neurotransmitter release, calcium responses, swimming ability, and survival [3]. In addition, AAGAB mutations are associated with punctate palmoplantar keratoderma type 1 (PPKP1), an autosomal dominant skin disease. Different AAGAB loss-of-function mutations have been identified in families with PPPK1, and in some families, there may be an association with cancer [4].

In conclusion, Aagab is essential for regulating neural activity during zebrafish larval development. Its role as an assembly chaperone for AP1 and AP2 adaptors is also crucial for proper intracellular membrane trafficking. The study of Aagab using genetic models like zebrafish mutants has provided insights into its functions in neural development and its association with diseases such as PPKP1, which may help in understanding the pathogenesis of related disorders.