As accessory component of the DNA polymerase gamma complex is involved in the replication of mitochondrial DNA (PubMed:3095323, PubMed:7499423). Does not bind DNA (PubMed:7499423). Essential for mitochondrial DNA maintenance and larval development (PubMed:11917141, PubMed:19924234). Component of the DNA polymerase gamma complex consisting of two subunits: the catalytic subunit DNApol-gamma/DNApolG1 and the accessory subunit PolG2/DNApol-gamma35. Expressed in ovaries (at protein level). Expressed in embryos (at protein level) (PubMed:9153213, PubMed:3095323). Expressed at low level in eggs (PubMed:10930405). Levels increase in early embryonic stages followed by a decrease in late embryos and a moderate increase in first-instar larvae (PubMed:10930405).