Small Cajal body specific RNA 17
| small Cajal body-specific RNA 17 | |
|---|---|
| 220px | |
| Predicted secondary structure and sequence conservation of SCARNA17 | |
| Identifiers | |
| Symbol | SCARNA17 |
| Alt. Symbols | snoU12-22 |
| Rfam | RF00492 |
| Other data | |
| RNA type | Gene; snRNA; snoRNA; scaRNA |
| Domain(s) | Eukaryota |
| GO | 0006396 0015030 0005730 |
| SO | 0000275 |
Small Cajal body-specific RNA 17 (also known as U12-22 scaRNA) is a type of small nuclear RNA which localises to the cajal bodies and proposed to guide the modification of RNA polymerase II transcribed spliceosomal RNAs U1, U2, U4, U5 and U12.[1][2]
The complete human U12-22/U4-8 scaRNA is composed of two tandem C/D box domains (termed U12-22 and U4-8). The 5' and 3' C/D domains are predicted to guide the 2'O-ribose methylation of residue U22 in U12 and residue C8 in U4 snRNAs respectively.[1] This family includes only the 5' C/D box domain (U12-22) as the 3' C/D box is represented by Small Cajal body specific RNA 18. The 3' C/D domain (U4-8) was also cloned previously by Darzacq and called U91.[3] Both the doublet (U12-22/U4-8) and singlet (U4-8) forms of this snRNA have been purified from HeLa cells. [1] The doublet form U12-22/U4-8 has been shown to localise to the nucleoplasm and is proposed to reside in the Cajal bodies whereas the U4-8 single domain appears to accumulate in the nucleolus. [1] In humans the genomic location of U12-88/U4-8 is intergenic and the purified transcript has been shown to possess a methylated guanosine cap suggesting it is independently transcribed by RNA polymerase II.[1]
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