May be involved in tissue-specific alternative RNA processing events. Interacts with TDRD3. Expressed in brain and lymphoblasts. Encoded on a bicistronic transcript that code for two proteins, SNRPN and SNURF. Patients with the autoimmune disease systemic lupus erythematosus (SLE) have autoantibodies directed against some of the individual snRNP polypeptides. The most common autoantigen is called Sm. N bears Sm epitopes. Belongs to the snRNP SmB/SmN family.