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Not to be confused with cytosine, cysteine, cystine, or cytisine.
Skeletal formula of cytidine
Ball-and-stick model of the cytidine molecule
IUPAC name
65-46-3 YesY
ChEBI CHEBI:17562 YesY
ChemSpider 5940 YesY
Jmol-3D images Image
KEGG D07769 YesY
MeSH Cytidine
PubChem 6175
Molar mass 243.217
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 YesY verify (what isYesY/N?)
Infobox references

Cytidine is a nucleoside molecule that is formed when cytosine is attached to a ribose ring (also known as a ribofuranose) via a β-N1-glycosidic bond. Cytidine is a component of RNA.

If cytosine is attached to a deoxyribose ring, it is known as a deoxycytidine.

Dietary sources of cytidine[edit]

Dietary sources of cytidine include foods with high RNA (ribonucleic acid) content,[1] such as organ meats, Brewer's yeast, as well as pyrimidine-rich foods such as beer. During digestion, RNA-rich foods are broken-down into ribosyl pyrimidines (cytidine and uridine), which are absorbed intact.[1] In humans, dietary cytidine is converted into uridine,[2] which is probably the compound behind cytidine's metabolic effects.

Cytidine analogs[edit]

There are a variety of cytidine analogs with potentially useful pharmacology. For example, KP-1461 is an anti-HIV agent that works as a viral mutagen,[3] and zebularine exists in E. coli and is being examined for chemotherapy. Low doses of azacitidine and its analog decitabine have shown results against cancer through epigenetic demethylation.[4]


  1. ^ a b Jonas DA; Elmadfa I; Engel KH et al. (2001). "Safety considerations of DNA in food". Ann Nutr Metab. 45 (6): 235–54. doi:10.1159/000046734. PMID 11786646. 
  2. ^ Wurtman RJ, Regan M, Ulus I, Yu L (Oct 2000). "Effect of oral CDP-choline on plasma choline and uridine levels in humans". Biochem Pharmacol. 60 (7): 989–92. doi:10.1016/S0006-2952(00)00436-6. PMID 10974208. 
  3. ^ John S. James. "New Kind of Antiretroviral, KP-1461". AIDS Treatment News. 
  4. ^ "Scientists reprogram cancer cells with low doses of epigenetic drugs". Medical XPress. March 22, 2012. 

External links[edit]