Deoxyribonucleotide (dNTP)

Deoxyribonucleotides are the monomeric units that polymerize to form deoxyribonucleic acid (DNA), the repository of genetic information in all living organisms and many viruses (Alberts et al., 2002). Each nucleotide comprises a nitrogenous base (adenine, guanine, cytosine, or thymine), a deoxyribose sugar, and one to three phosphate groups. In therapeutic contexts, DNA nucleotides and their metabolic pathways are primary targets for chemotherapy and antiviral agents (StatPearls, 2023). Antimetabolite drugs, such as 5-fluorouracil and gemcitabine, mimic these nucleotides to inhibit essential biosynthetic enzymes or incorporate into DNA strands to cause premature chain termination. Other agents, like alkylating drugs and intercalators, interact directly with the DNA polymer formed from these nucleotides to induce structural damage and trigger apoptosis (NCBI, 2022). Because these targets are fundamental to all dividing cells, drugs affecting DNA nucleotides often exhibit a narrow therapeutic index and significant side effects, such as bone marrow suppression. Furthermore, the depletion of nucleotide pools or the introduction of errors during replication can lead to genomic instability, which is both a therapeutic goal in oncology and a potential cause of secondary malignancies. Monitoring biomarkers like γH2AX can help assess the extent of DNA damage induced by these therapies in clinical settings.

Other names

DNA nucleotidesDeoxyribonucleoside triphosphatesDNA building blocksDNA bases

Drugs targeting DNA nucleotides function as antimetabolites that inhibit synthesis, nucleoside analogs that cause chain termination, or agents that physically damage the DNA polymer through alkylation and intercalation (StatPearls, 2023; NCBI, 2022).