DNA Cross-Linking via Alkylation

DNA cross-linking via alkylation is a critical molecular event where bifunctional electrophilic chemicals form covalent bridges between nucleotides within or across DNA strands. This disrupts essential genetic processes leading primarily to cytotoxicity—a feature harnessed by several anticancer therapies. The specificity depends on agent structure and reactivity toward different nucleotide positions—with guanine being most susceptible—and cellular response involves complex multi-protein repair systems whose failure increases sensitivity to these damaging events.

Covalent cross-linking of DNA strands, preventing replication and transcription