DNA nucleobases (DNA)

DNA nucleobases, comprising adenine, guanine, cytosine, and thymine, are the structural components of deoxyribonucleic acid (DNA) that encode the genetic instructions for all living organisms (National Human Genome Research Institute, 2024). Located within the cell nucleus, these bases are essential for the high-fidelity storage and transmission of genetic information during cell division and protein synthesis (Nature Education, 2014). In oncology, DNA nucleobases are classic therapeutic targets; drugs like alkylating agents and platinum complexes bind directly to these bases—most frequently guanine—to form adducts and cross-links (StatPearls, 2023). These structural alterations interfere with the unwinding of the DNA double helix, stalling replication forks and inhibiting transcription (NIH/NCI, 2023). This mechanism is particularly effective against rapidly proliferating cancer cells but also affects normal dividing cells, leading to characteristic toxicities and the risk of long-term genomic instability (American Cancer Society, 2024).

Other names

Genomic DNADeoxyribonucleic acidNitrogenous basesNuclear DNADNA bases

Drugs targeting DNA nucleobases typically act through covalent modification (alkylation), inter- or intra-strand cross-linking, or intercalation (PubChem, 2024). These actions physically obstruct the machinery required for DNA replication and RNA transcription, leading to DNA strand breaks and the activation of DNA damage response pathways, which ultimately induce programmed cell death (apoptosis) in susceptible cells (PubMed, 2022).