Trypanosomal kinetoplast DNA (kDNA)

Trypanosomal kinetoplast DNA (kDNA) is a unique and complex mitochondrial genome structure found in kinetoplastid protozoa, such as Trypanosoma and Leishmania species (Jensen & Englund, 1998, Cell). It consists of a massive, catenated network of thousands of circular DNA molecules, categorized into maxicircles and minicircles (Shapiro & Englund, 1995, Annu Rev Microbiol). Maxicircles encode essential components of the mitochondrial respiratory chain, while minicircles encode guide RNAs necessary for the extensive RNA editing of maxicircle transcripts (Stuart et al., 2005, Science). Because this structure is absent in mammalian cells, it serves as a highly specific therapeutic target for antiparasitic agents (D'Ambrosio et al., 2016, Molecules). Drugs like pentamidine and diminazene target kDNA by binding to its minor groove, particularly in AT-rich regions, which interferes with DNA replication and the activity of mitochondrial topoisomerases (Wilson et al., 2008, Curr Med Chem). This disruption leads to the loss of the kDNA network, a condition known as dyskinetoplasty, which ultimately results in parasite death due to the failure of mitochondrial energy metabolism (Schnaufer et al., 2002, Science).

Other names

Kinetoplast DNAMitochondrial DNA of trypanosomatidskDNA networkKinetoplast mitochondrial DNA

Drugs typically bind to the minor groove of AT-rich regions or intercalate into the DNA, leading to the inhibition of mitochondrial topoisomerases, disruption of the catenated network structure, and eventual loss of mitochondrial function (Wilson et al., 2008, Curr Med Chem).