Predicted to enable 3'-5' exonuclease activity and DNA-directed DNA polymerase activity. Involved in several processes, including defecation; determination of adult lifespan; and mitochondrial DNA replication. Predicted to be located in mitochondrion. Predicted to be part of gamma DNA polymerase complex. Human ortholog(s) of this gene implicated in several diseases, including mitochondrial DNA depletion syndrome (multiple); mitochondrial myopathy (multiple); and ovarian disease (multiple). Is an ortholog of human POLG (DNA polymerase gamma, catalytic subunit).