Plays a role in cortical progenitor cell proliferation and differentiation. Promotes dendritic spine development of post-migratory cortical projection neurons by modulating the beta-catenin signaling pathway. Interacts with CCDC85B. Expressed in the brain (PubMed:27404227). Expressed in cortical cells of the germinal ventricular zone and the cortical plate. Underexpressed in the dorsolateral prefrontal cortex, primary visual cortex and cerebellar cortex compared with Down Syndrome patients (at protein level) (PubMed:27404227). Belongs to the EURL family. Truncated C-terminus.