Acanthamoeba DNA phosphate backbone and chromosomes

The Acanthamoeba DNA phosphate backbone and chromosomes represent a critical therapeutic target for biguanide-class anti-amoebic agents, most notably polihexanide (PHMB) (EMA, 2024). PHMB is a polycationic polymer that exhibits a dual mechanism of action against both the trophozoite and cyst stages of Acanthamoeba species. After initially disrupting the amoebic cell membrane through electrostatic interactions with phospholipids, the drug enters the cytoplasm and translocates to the nucleus (Chindera et al., 2016). Once inside, it binds extensively to the negatively charged phosphate backbone of the DNA, causing structural damage and condensation of the chromosomes (Sowlati-Hasjin et al., 2020). This interaction effectively blocks DNA replication and transcription, leading to the death of the parasite. This target is highly significant due to its selectivity; PHMB is excluded from the nuclei of mammalian host cells, where it is instead sequestered in endosomes, thereby minimizing host toxicity (EMA, 2024). Targeting the genomic material is essential for eradicating the resilient cyst form, which is often responsible for treatment failure and recurrence in sight-threatening conditions such as Acanthamoeba keratitis.

Other names

Acanthamoeba DNAAcanthamoeba chromosomesAcanthamoeba genomic DNA

Binding to the DNA phosphate backbone and condensation of chromosomes, leading to inhibition of DNA replication and cell death.