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The maintenance of DNA methylation in nascent DNA is a critical event for numerous biological processes. Following DNA replication, DNMT1 is the key enzyme that strictly copies the methylation pattern from the parental strand to the nascent DNA. However, the mechanism underlying this highly specific event is not thoroughly understood. In this study, we identified topoisomerase IIα (TopoIIα) as a novel regulator of the maintenance DNA methylation. UHRF1, a protein important for global DNA methylation, interacts with TopoIIα and regulates its localization to hemimethylated DNA. TopoIIα decatenates the hemimethylated DNA following replication, which might facilitate the methylation of the nascent strand by DNMT1. Inhibiting this activity impairs DNA methylation at multiple genomic loci. We have uncovered a novel mechanism during the maintenance of DNA methylation.UHRF1 is required for the maintenance of DNA methylation. Results UHRF1 interacts with topoisomerase II and regulates its localization to pericentric heterochromatin. Conclusion Topoisomerase II regulates the maintenance of DNA methylation. Significance Our study reveals a novel molecular mechanism of the maintenance of DNA methylation.
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Lu et al. (2014) studied this question.
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