Deoxycytidine (dC)

Deoxycytidine is a pyrimidine nucleoside consisting of the nitrogenous base cytosine attached to a deoxyribose sugar ring. It plays a fundamental role in cellular biology as a precursor for DNA synthesis and repair through the nucleotide salvage pathway, where it is converted into deoxycytidine triphosphate (dCTP) [PubChem CID 13712]. Although deoxycytidine itself is a naturally occurring metabolite and not a protein target, it is of significant pharmacological importance because its metabolic pathway is the primary activation route for several nucleoside analog drugs. Enzymes such as deoxycytidine kinase (DCK) phosphorylate both deoxycytidine and its synthetic analogs, such as gemcitabine and cytarabine, which then incorporate into DNA to induce apoptosis in malignant cells [PubMed: 23773480]. Understanding deoxycytidine metabolism is crucial for optimizing the efficacy of these antimetabolite therapies in treating leukemias and various solid tumors [StatPearls: NBK557519].

Other names

2'-DeoxycytidineCytosine deoxyriboside1-(2-Deoxy-beta-D-ribofuranosyl)cytosine

Deoxycytidine serves as the endogenous substrate for deoxycytidine kinase (DCK); therapeutic nucleoside analogs compete with deoxycytidine for phosphorylation by DCK and subsequent incorporation into DNA, leading to chain termination or DNA synthesis inhibition [PubMed: 16553706].