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S-phase induced RNAs initiate formation of DNA replication origins

Ummarino, S.; Ebralidze, A. K.; Monteleone, E.; Zhang, Y.; Trinh, B. Q.; Di Ruscio, A.; Tenen, D. G.

2021-10-20 molecular biology
10.1101/2021.10.19.465050 bioRxiv
Show abstract

Coordinated initiation of DNA replication is essential to ensure efficient and timely DNA synthesis. Yet, the mechanism governing the "initiation" process in eukaryotic cells remains elusive. Here, we present data demonstrating a novel feature of RNAs transcribed in the proximity of actively replicating gene loci. We show that S-phAse-RNAs aNChoring ORC1 (ANCORs) to the histone variant H2A.Z are licensors of the DNA replication process. The concomitant ANCOR-H2A.Z interaction is essential for the cells to initiate duplication of their genetic heritage. Widespread and locus-specific perturbations of these transcripts correlate with anomalous replication patterns and loss of the replicative marker at the origin site. Collectively, we unveil an RNA-mediated mechanism as the missing link for the generation of active replication origins and delineate a potential strategy to modulate replication in human cells at a local and global level.

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