The accurate duplication and transmission of genetic information is critical for cell growth and proliferation, and this is ensured in part by the multi-layered regulation of DNA synthesis. One of the key steps in this process is the selection and activation of the sites of replication initiation, or origins, across the genome. Interestingly, origin usage changes during development and in different pathologies, suggesting an integral interplay between the establishment of replication initiation along the chromosomes and cellular function. The present review discusses how the spatiotemporal organization of replication origin activation may play crucial roles in the control of biological events.
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