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1.  Genomic approaches to the initiation of DNA replication and chromatin structure reveal a complex relationship 
The mechanisms regulating the coordinate activation of tens of thousands of replication origins in multicellular organisms remain poorly explored. Recent advances in genomics have provided valuable information about the sites at which DNA replication is initiated and the selection mechanisms of specific sites in both yeast and vertebrates. Studies in yeast have advanced to the point that it is now possible to develop convincing models for origin selection. A general model has emerged, but yeast data have also revealed an unsuspected diversity of strategies for origin positioning. We focus here on the ways in which chromatin structure may affect the formation of pre-replication complexes, a prerequisite for origin activation. We also discuss the need to exercise caution when trying to extrapolate yeast models directly to more complex vertebrate genomes.
doi:10.1093/bfgp/elr001
PMCID: PMC3080764  PMID: 21278082
DNA replication origin; nucleosome positioning; chromatin structure; transcription factors; genome-wide studies

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