DNA and Chromatin (DNA)

DNA nucleobases and chromatin constitute the primary structural and functional framework of the cellular genome. DNA nucleobases—adenine, guanine, cytosine, and thymine—serve as the fundamental units of genetic coding, while chromatin represents the higher-order complex of DNA and histone proteins that regulates gene accessibility and chromosomal stability (NIH, 2023). These components are critical targets in oncology, where drugs aim to disrupt the rapid replication cycles of malignant cells. Therapeutic interventions include alkylating agents and platinum-based drugs that form covalent bonds with nucleobases, intercalating agents that wedge into the DNA helix, and antimetabolites that substitute for natural bases to halt synthesis (PubChem, 2024). Furthermore, targeting the chromatin structure through epigenetic modifiers allows for the reprogramming of gene expression in various disease states (PubMed, 2021). Despite their efficacy, the lack of absolute specificity for cancerous versus healthy cells often results in significant systemic toxicities, such as bone marrow suppression and organ damage (StatPearls, 2023).

Other names

Deoxyribonucleic acidGenomic DNANucleosome complexGenetic materialNuclear chromatin

Drugs targeting these components act through DNA alkylation, covalent cross-linking, intercalation into the double helix, or by acting as antimetabolites that substitute for natural nucleobases to terminate chain elongation (StatPearls, 2023; PubChem, 2024). Additionally, chromatin-directed therapies inhibit enzymes like histone deacetylases (HDACs) to alter the physical state of chromatin, thereby modulating gene transcription (PubMed, 2022).