DNA crosslinking and alkylation (None commonly used; sometimes referred to as "DNA crosslinker/alkylator" in pharmacology.)

DNA crosslinking and alkylation refer to chemical modifications where exogenous or endogenous agents form covalent bonds within or between strands of the DNA double helix. These modifications disrupt essential processes like replication and transcription, often triggering cell cycle arrest and programmed cell death (apoptosis) if the damage cannot be repaired. This mechanism underlies the cytotoxicity exploited by many chemotherapeutic agents—especially those targeting rapidly dividing cancer cells—but also accounts for their potential toxicity toward normal tissues with high turnover rates. The effectiveness and cellular response depend on factors such as drug stability, ability to penetrate cells, efficiency at forming adducts/crosslinks, mismatch repair pathway integrity, and p53 tumor suppressor function.

Other names

DNA alkylatorDNA crosslinkerAlkylating agent (refers to the class of drugs causing this effect)Cross-linking agent

Drugs that cause DNA alkylation/crosslinking form covalent bonds with nucleotides in the DNA, resulting in: Interstrand or intrastrand crosslinks that block replication/transcription, Induction of irreparable damage, Activation of cellular pathways leading to apoptosis if repair fails. Mismatch repair proteins such as MutSα are involved in recognizing some types of lesions and signaling for apoptosis.