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Function
The protein encoded by this gene contains a RING finger motif and an FHA domain. This protein has been shown to interact with several class II ubiquitin-conjugating enzymes (E2), including UBE2E1/UBCH6, UBE2E2, and UBE2E3, and may act as a ubiquitin ligase (E3) in the ubiquitination of certain nuclear proteins. Alternatively spliced transcript variants encoding distinct isoforms have been reported.

RNF8 promotes repair of DNA damage through three DNA repair pathways: homologous recombinational repair (HRR), non-homologous end joining (NHEJ), and nucleotide excision repair (NER). DNA damage is considered to be the primary cause of cancer, and deficiency in DNA repair can cause mutations leading to cancer. A deficiency in RNF8 predisposes mice to cancer.