Three prime repair exonuclease 2 is an enzyme that in humans is encoded by the TREX2 gene.[5][6]
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This gene encodes a protein with 3' exonuclease activity. Enzymes with this activity are involved in DNA replication, repair, and recombination. Similarity to an E. coli protein suggests that this enzyme may be a subunit of DNA polymerase III, which does not have intrinsic exonuclease activity.[6]
Mutations in this gene may lead to Aicardi-Goutieres syndrome