Binds to mitochondrial DNA (mtDNA) and plays a role in the maintenance of mtDNA levels (PubMed:21258070). May also associate with telomeric DNA, binding to at least two telomeric repeats of the sequence 5'-TTTAGGG-3' (Probable). Self-associates. Mainly localizes to telomeres in mature oocytes and embryonic cells. Highly expressed in oocytes (at protein level). Expressed in all cells of early and late embryos (at protein level) (PubMed:14623111). Expression diminishes at the time of hatching, and there is very little expression in larvae and adults (at protein level) (PubMed:14623111). RNAi-mediated knockdown results in reduced mitochondrial DNA (mtDNA) copy number.