Double-stranded nucleic acid (dsNA) (dsNA)

Double-stranded nucleic acids (dsNAs), primarily comprising double-stranded DNA (dsDNA) and double-stranded RNA (dsRNA), are fundamental biological polymers that store and transmit genetic information. In eukaryotic cells, dsDNA is the repository of the genome, while dsRNA is typically encountered as a viral replication intermediate or a regulatory molecule that triggers innate immune pathways such as the cGAS-STING or TLR3 signaling cascades [NCBI, 2023]. As therapeutic targets, dsNAs are most prominently addressed in oncology, where a wide array of chemotherapeutic agents—including intercalators, alkylators, and cross-linkers—physically disrupt the DNA duplex to induce apoptosis in rapidly dividing cells [StatPearls, 2024]. Additionally, synthetic dsRNA mimetics are utilized in immunotherapy to activate pattern recognition receptors and enhance the body's defense against viruses and tumors [PubMed, 2022]. However, the lack of high specificity for diseased versus healthy nucleic acids often results in significant clinical challenges, including systemic toxicity and the risk of therapy-induced secondary cancers [NIH, 2023]. Understanding the structural dynamics of these duplexes remains critical for developing more selective ligands that can distinguish between pathological and physiological nucleic acid states [Nature, 2021].

Other names

dsDNAdsRNADuplex DNADuplex RNADouble-stranded DNADouble-stranded RNA

Drugs targeting double-stranded nucleic acids primarily function through physical or chemical disruption of the duplex structure. This includes intercalation, where planar molecules insert between base pairs; covalent alkylation or cross-linking, which prevents strand separation; and the induction of oxidative stress leading to strand breaks. In the case of dsRNA, synthetic analogues act as agonists for pattern recognition receptors to stimulate immune responses.