Predicted to enable DNA topoisomerase type I (single strand cut, ATP-independent) activity and single-stranded DNA binding activity. Predicted to be involved in DNA topological change; chromosome separation; and mitochondrial DNA metabolic process. Predicted to be located in PML body. Predicted to be active in nucleus. Human ortholog(s) of this gene implicated in autosomal recessive progressive external ophthalmoplegia with mitochondrial DNA deletions 5. Orthologous to human TOP3A (DNA topoisomerase III alpha). [provided by Alliance of Genome Resources, Apr 2022]