Protozoal AT-rich DNA (AT-rich DNA)

Protozoal AT-rich DNA refers to the genomic and extragenomic DNA of certain protozoan parasites, such as Plasmodium falciparum and Trypanosoma species, which possess a significantly higher adenine-thymine (AT) content compared to the human genome (Bulloch & Ralph, 2022). In P. falciparum, the AT content can reach approximately 80%, whereas human DNA is roughly 60% AT-rich, providing a basis for selective therapeutic intervention (NIH, 2022). This unique biochemical characteristic is exploited by small molecules known as minor groove binders, which specifically interact with the narrow groove of the DNA double helix at AT-rich sequences. Drugs such as pentamidine and diminazene utilize this mechanism to disrupt essential biological processes, including DNA replication, RNA transcription, and the structural integrity of kinetoplast DNA in trypanosomes (Wikipedia, 2023; MedChemExpress, 2023). The binding of these agents often leads to the collapse of mitochondrial membrane potential and the induction of programmed cell death in the parasite (NIH, 2020). Furthermore, the high density of AT-rich regions in the parasite genome increases the frequency of potential binding sites compared to host cells, enhancing selectivity (ResearchGate, 2001). Despite their efficacy, these drugs are associated with significant safety concerns, including nephrotoxicity and hepatotoxicity, and their use is increasingly challenged by the emergence of drug-resistant parasite strains (Trends Parasitol, 2003). Research continues into novel AT-specific DNA-reactive compounds to overcome these limitations and provide more effective treatments for parasitic infections (Trends Pharmacol Sci, 2022).

Other names

Kinetoplast DNAkDNAParasite genomic DNAAT-rich sequencesProtozoan DNA

Minor groove binding to AT-rich DNA sequences, inhibiting DNA replication, transcription, and mitochondrial function (Bulloch & Ralph, 2022; MedChemExpress, 2023).