Abstract
We herein report two new genes, human neugrin and mouse homologue m-neugrin, found by screening the cDNA library for the human spinal cord. The neugrin mRNA encodes 219 amino acids and its deduced amino acid sequence contains an NLS-like domain. No previously known motif is found in it. m-neugrin mRNA encodes 233 amino acids. Neugrin and m-Neugrin are 70% homologous in amino acid sequence. Northern analysis revealed that neugrin was strongly expressed in the heart, brain, and skeletal muscle, and m-neugrin in the liver, kidney, and brain. A transfection study indicated that these proteins are localized in the nucleus. Although the expression of neugrin was found to be ubiquitous in the nervous system, in situ hybridization showed that both neugrin and m-neugrin were expressed mainly in the neurons rather than the glial cells. Their expression was highly upregulated with the neurite outgrowth associated with neuronal differentiation in neuroblastoma cell lines. These results indicate that neugrin and m-neugrin are mainly expressed in neurons in the nervous system, and play an important role in the process of neuronal differentiation.
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