Involved in the regulation of multiple aspects of embryonic and adult neurogenesis (PubMed:17035248). Required for neural progenitor proliferation in the ventrical/subventrical zone during embryonic brain development and in the adult dentate gyrus of the hippocampus. Participates in the Wnt-mediated neural progenitor proliferation as a positive regulator by modulating GSK3B activity and CTNNB1 abundance. Plays a role as a modulator of the AKT-mTOR signaling pathway controlling the tempo of the process of newborn neurons integration during adult neurogenesis, including neuron positioning, dendritic development and synapse formation. Inhibits the activation of AKT-mTOR signaling upon interaction with CCDC88A. Regulates the migration of early-born granule cell precursors toward the dentate gyrus during the hippocampal development. Inhibits ATF4 transcription factor activity in neurons by disrupting ATF4 dimerization and DNA-binding (By similarity). Plays a role, together with PCNT, in the microtubule network formation (By similarity). Interacts with NDEL1 (PubMed:17035248). Interacts with CCDC88A (via C-terminus); the interaction is direct. Interacts with GSK3B (By similarity). Interacts with tubulin alpha, ACTN2, ANKHD1, ATF4, ATF5, CEP63, EIF3S3, MAP1A, NDEL1, PAFAH1B1, RANBP9, SPTBN4, SYNE1 and TRAF3IP1. Interaction with microtubules may be mediated in part by TRAF3IP1. Interacts (via C-terminal) with PCNT. Interacts with CHCHD6 (By similarity). Interacts with CCDC141 (By similarity). Interacts with FBXW7, the substrate-recognition component of a SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex; the interaction targets DISC1 for proteasomal degradation (By similarity). Interacts with ZNF365 (PubMed:17389905). Interacts with ATF4; inhibiting ATF4 transcription factor activity by disrupting ATF4 dimerization and DNA-binding (By similarity). Interacts with PDE4B (By similarity). Colocalizes with NDEL1 in the perinuclear region and the centrosome (By similarity). Localizes to punctate cytoplasmic foci which overlap in part with mitochondria (PubMed:12506198). Colocalizes with PCNT at the centrosome (By similarity). Expressed in brain, heart, kidney, liver and thymus. Within the brain expression is high in the cerebral cortex, hippocampus and olfactory bulb and is also seen at lower levels in the cerebellum (at protein level). Expressed at high levels at 20.5 dpc. Expressed at lower levels at P2 and P6 and in adults (at protein level). Up-regulated during neurite outgrowth upon differentiation with NGF. Ubiquitinated. Ubiquitination with 'Lys-48'-linked polyubiquitin chains leads to its proteasomal degradation.