Abstract
In eukaryotes, DNA replication progresses through a finely orchestrated temporal and spatial program. The 3D genome structure and nuclear architecture have recently emerged as fundamental determinants of the replication program. Factors with established roles in replication have been recognized as genome organization regulators. Exploiting paradigms from yeasts and mammals, we discuss how DNA replication is regulated in time and space through DNA-associated trans-acting factors, diffusible limiting replication initiation factors, higher-order chromatin folding, dynamic origin localization, and specific nuclear microenvironments. We present an integrated model for the regulation of DNA replication in 3D and highlight the importance of accurate spatio-temporal regulation of DNA replication in physiology and disease.
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