Deoxyribonuclease which catalyzes (in vitro) the decatenation of kinetoplast DNA, which are circular DNA catenated to each other, producing linear DNA molecules (PubMed:23187801). Plays an important role in chromosomal segregation and cell cycle progression during eye development probably via its DNA decatenation activity (PubMed:23187801). Binds 2 divalent metal cations per subunit. Predominantly expressed in the eye during embryonic development. Morpholino knockdown in the embryo results in an abnormal cell cycle progression, formation of polyploidy and aberrant chromatin structures (PubMed:23187801). Consequently, the morphants have disordered eye cell layers and significantly smaller eyes compared to the wild-type counterpart (PubMed:23187801). Belongs to the metallo-dependent hydrolases superfamily. TatD-type hydrolase family.