Functional component of the Nogo receptor signaling complex (RTN4R/NGFR) in RhoA activation responsible for some inhibition of axonal regeneration by myelin-associated factors. Is also an important negative regulator of oligodentrocyte differentiation and axonal myelination (By similarity). Acts in conjunction with RTN4 and RTN4R in regulating neuronal precursor cell motility during cortical development. Homotetramer. Forms a ternary complex with RTN4R/NGFR and RTN4R/TNFRSF19 (By similarity). Interacts with NGRF and MYT1L (PubMed:18186492). Interacts with RTN4R (PubMed:18186492, PubMed:22923615). Highly specific expression in the central nervous system. Predominant expression in neocortex, amygdala, hippocampus, thalamus and entorhinal cortex, with lower levels in cerebellum and basal nuclei. Expressed broadly at high levels in the whole embryo and becomes progressively restricted to the central nervous system by 14.5 dpc. Extensively expressed across the central nervous system through late embryogenesis and during postnatal development, with a peak of expression around the first week after birth. Up-regulated in brain from MPTP-intoxicated mice, a model for Parkinson disease. The intracellular domain of LINGO1 interacts with MYT1L. N-glycosylated. Contains predominantly high-mannose glycans (By similarity). In mice lacking Lingo1 and MPTP-intoxicated, a model for Parkinson disease, the dopaminergic neurons survival is increased and behavioral abnormalities reduced.