Ribonucleotides that are misincorporated into DNA during replication are removed by topoisomerase 1, which generates 3′-terminal adducts that are not amenable to DNA repair and thus compromise genome stability. A recent report by Li et al. reveals that Apn2/APE2 resolves such blocked 3′ termini, thereby suppressing topoisomerase 1–induced mutations at ribonucleotide monophosphate sites within the genome.
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Yan, S. Resolution of a complex crisis at DNA 3′ termini. Nat Struct Mol Biol 26, 335–336 (2019). https://doi.org/10.1038/s41594-019-0215-0
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DOI: https://doi.org/10.1038/s41594-019-0215-0