Error-free and mutagenic processing of topoisomerase 1-provoked damage at genomic ribonucleotides

The EMBO Journal
Justin L Sparks, Peter M Burgers

Abstract

Genomic ribonucleotides incorporated during DNA replication are commonly repaired by RNase H2-dependent ribonucleotide excision repair (RER). When RNase H2 is compromised, such as in Aicardi-Goutières patients, genomic ribonucleotides either persist or are processed by DNA topoisomerase 1 (Top1) by either error-free or mutagenic repair. Here, we present a biochemical analysis of these pathways. Top1 cleavage at genomic ribonucleotides can produce ribonucleoside-2',3'-cyclic phosphate-terminated nicks. Remarkably, this nick is rapidly reverted by Top1, thereby providing another opportunity for repair by RER. However, the 2',3'-cyclic phosphate-terminated nick is also processed by Top1 incision, generally 2 nucleotides upstream of the nick, which produces a covalent Top1-DNA complex with a 2-nucleotide gap. We show that these covalent complexes can be processed by proteolysis, followed by removal of the phospho-peptide by Tdp1 and the 3'-phosphate by Tpp1 to mediate error-free repair. However, when the 2-nucleotide gap is associated with a dinucleotide repeat sequence, sequence slippage re-alignment followed by Top1-mediated religation can occur which results in 2-nucleotide deletion. The efficiency of deletion formation shows st...Continue Reading

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