This gene encodes several isoforms of a nucleocytoplasmic adaptor protein, one of which was initially identified as a;MYC-interacting protein with features of a tumor suppressor. Isoforms that are expressed in the central nervous system;may be involved in synaptic vesicle endocytosis and may interact with dynamin, synaptojanin, endophilin, and clathrin.;Isoforms that are expressed in muscle and ubiquitously expressed isoforms localize to the cytoplasm and nucleus and;activate a caspase-independent apoptotic process. Studies in mouse suggest that this gene plays an important role in;cardiac muscle development. Alternate splicing of the gene results in ten transcript variants encoding different;isoforms. Aberrant splice variants expressed in tumor cell lines have also been described.