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Functional Centromeres Determine the Activation Time of Pericentric Origins of DNA Replication in Saccharomyces cerevisiae

Figure 7

Models for centromere-mediated early origin activation.

(A) Kinetochore/microtubule interaction orients the centromere and pericentric DNA near the microtubule organizing center (MTOC) where there is an enrichment of replication initiation factors. (B) Tension exerted by the kinetochore/microtubule interaction induces an altered chromatin structure of pericentric DNA that provides accessibility of embedded origins to initiation factors. (C) Kinetochore proteins interact directly (or indirectly) with origin initiation factors recruiting them to nearby origins. (D) The organization of pericentric DNA into the C-loop orients origins within the C-loop to the periphery of the chromatin mass increasing their accessibility to initiation factors.

Figure 7