Involved in mitochondrial DNA (mtDNA) metabolism. Could function as an adenine nucleotide-dependent DNA helicase. Function inferred to be critical for lifetime maintenance of mtDNA integrity. In vitro, forms in combination with POLG, a processive replication machinery, which can use double-stranded DNA (dsDNA) as tplate to synthesize single-stranded DNA (ssDNA) molecules. May be a key regulator of mtDNA copy number in mammals.
Human mitochondrial DNA deletions associated with mutations in the gene for Twinkle, a phage T7 gene 4-like protein localized in mitochondria.Spelbrink J.N., Li F.-Y., Tiranti V., Nikali K., Yuan Q.-P., Tariq M., Wanrooij S., Garrido N., Comi G., Morandi L., Santoro L., Toscano A., Fabrizi G.-M., Somer H., Croxen R., Beeson D., Poulton J., Suomalainen A. , Jacobs H.T., Zeviani M., Larsson C.Nat. Genet. 28:223-231(2001)
Research Topic:Epigenetics and Nuclear Signaling