Small Nuclear RNA U1

**Semantic type:** Nucleic Acid, Nucleoside, or Nucleotide

**Definition:** Small nuclear RNA (snRNA) U1 is 164 bases in length; it forms four stem-loops and has 5'-trimethylguanosine five-prime cap. This non-coding snRNA is the RNA component of the U1 small nuclear ribonucleoprotein (snRNP) complex, which is involved in the splicing of pre-mRNA.

**Synonyms:** - RNU1 - U1 - U1 Small Nuclear RNA - U1 Spliceosomal RNA - U1 snRNA - snRNA U1