NCIt definition : A family of genes that encode small nuclear RNA (snRNA) U1, which is involved in the
assembly and activity of the spliceosome as the RNA component of the U1 small nuclear
ribonucleoprotein (snRNP) complex.;
NCIt note : HGNC lists 4 genes (RNU1-1, RNU1-2, RNU1-3 and RNU1-4) and 118 pseudogenes (RNU1-5P
through RNU1-155P) that may potentially encode small nuclear RNA U1 (RNU1).;