DNA polymerases and genomic DNA (DNA pol/DNA)

DNA polymerases and genomic DNA represent the fundamental components of the cellular replication and repair apparatus. DNA polymerases are a diverse group of enzymes responsible for synthesizing new DNA strands by catalyzing the addition of nucleotides to a DNA template, a process essential for cell division and the propagation of genetic material (UniProt, 2024). Genomic DNA serves as the repository of genetic information and the physical substrate upon which polymerases and other regulatory proteins act (NIH, 2024). In therapeutic contexts, this system is a primary target for treating malignancies and infectious diseases. Anticancer therapies often utilize DNA-damaging agents to induce apoptosis in rapidly dividing cells, while antiviral drugs frequently employ nucleoside analogs to selectively inhibit viral DNA polymerases (StatPearls, 2023). However, because these targets are ubiquitous in living cells, drugs directed at them often carry significant risks of systemic toxicity, including bone marrow suppression and organ damage (PubMed, 2022).

Other names

DNA replication machineryDeoxyribonucleic acidDNA-directed DNA polymeraseDNA synthesis complexGenomic DNA template

The mechanism of action involves the disruption of DNA replication and repair. Alkylating agents (e.g., cisplatin) form covalent bonds with DNA bases, leading to intra-strand and inter-strand cross-links that prevent DNA strand separation (StatPearls, 2023). Antimetabolites (e.g., 5-fluorouracil, gemcitabine) compete with natural nucleotides for incorporation into the growing DNA strand by DNA polymerases, often leading to chain termination or the induction of DNA damage responses (NIH, 2024). Intercalating agents (e.g., doxorubicin) slide between DNA base pairs, causing structural distortion and inhibiting the action of enzymes like topoisomerases and polymerases (PubMed, 2022). Viral-specific inhibitors, such as acyclovir, are selectively phosphorylated by viral kinases and then act as potent inhibitors of viral DNA polymerase, terminating the viral DNA chain (PubChem, 2024).