Small nucleolar RNA SNORA69

Small nucleolar RNA SNORA69 (also known as U69) is a non-coding RNA (ncRNA) molecule which functions in the biogenesis (modification) of other small nuclear RNAs (snRNAs). This type of modifying RNA is located in the nucleolus of the eukaryotic cell which is a major site of snRNA biogenesis. It is known as a small nucleolar RNA (snoRNA) and also often referred to as a 'guide RNA'.ACA69 was originally cloned from HeLa cells cite journal | author = Ganot P, Caizergues-Ferrer M, Kiss T | title = The family of box ACA small nucleolar RNAs is defined by an evolutionarily conserved secondary structure and ubiquitous sequence elements essential for RNA accumulation | journal = Genes Dev. | volume = 11 | issue = 7 | pages = 941–56 | year = 1997 | pmid = 9106664 | doi = | issn = ] and belongs to the H/ACA box class of snoRNAs as it has the predicted hairpin-hinge-hairpin-tail structure, has the conserved H/ACA-box motifs and is found associated with GAR1 protein. snoRNA ACA69 is predicted to guide the pseudouridylation of U36 of 18S and U69 of 5.8S ribosomal RNA (rRNA). Pseudouridylation is the (isomerisation of the nucleoside uridine) to the different isomeric form pseudouridine.

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* [http://www-snorna.biotoul.fr/plus.php?id=U69 snoRNAbase entry for U69]