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DNA replication origins, ORC/DNA interaction, and assembly of pre-replication complex in eukaryotes Sun J; Kong DActa Biochim Biophys Sin (Shanghai) 2010[Jul]; 42 (7): 433-9Chromosomal DNA replication in eukaryotic cells is highly complicated and sophisticatedly regulated. Owing to its large size, a typical eukaryotic genome contains hundreds to tens of thousands of initiation sites called DNA replication origins where DNA synthesis takes place. Multiple initiation sites remove the constraint of a genome size because only a certain amount of DNA can be replicated from a single origin in a limited time. The activation of these multiple origins must be coordinated so that each segment of chromosomal DNA is precisely duplicated only once per cell cycle. Although DNA replication is a vital process for cell growth and its mechanism is highly conserved, recent studies also reveal significant diversity in origin structure, assembly of pre-replication complex (pre-RC) and regulation of replication initiation along evolutionary lines. The DNA replication origins in the fission yeast Schizosaccharomyces pombe are found to contain a second essential element that is bound by Sap1 protein besides the essential origin recognition complex-binding site. Sap1 is recently demonstrated to be a novel replication initiation protein that plays an essential role in loading the initiation protein Cdc18 to origins and thus directly participates in pre-RC formation. In this review, we summarize the recent advance in understanding how DNA replication origins are organized, how pre-RC is assembled and how DNA replication is initiated and regulated in yeast and metazoans.|*DNA Replication[MESH]|*Replication Origin[MESH]|Animals[MESH]|Cell Cycle[MESH]|DNA/*metabolism[MESH]|Eukaryotic Cells/*metabolism[MESH]|Models, Biological[MESH]|Origin Recognition Complex/genetics/*metabolism[MESH]|Protein Binding[MESH] |