2'-O-methylation is a common nucleoside modification of RNA, where a methyl group is added to the 2' hydroxyl of the ribose moiety of a nucleoside, producing a methoxy group. 2'-O-methylated nucleosides are mostly found in ribosomal RNA and small nuclear RNA and occur in the functionally essential regions of the ribosome and splicesome. Also, 2'-O-methylation of adenosine in an RNA prevents adenosine deaminase from editing it to an inosine.
Having the chemical properties intermediate between RNA and DNA, 2'-O-methylation is presumed to have one of the reactive group of RNA molecules on early earth that would have given rise to DNA 1.
Recently a novel method to map 2'-O ribose methylations by high throughput sequencing has been published.  The method is quantitative and maps all modifications in a single experiment.
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