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Mammalian chromosome replication starts from distinct sites, but the principles governing initiation site selection are unclear because proteins essential for DNA replication do not exhibit sequence-specific DNA binding. We identified a replication initiation determinant (RepID) protein that binds a subset of replication initiation sites. A large fraction of RepID binding sites share a common G-rich motif and exhibit elevated replication initiation. RepID is required for initiation of DNA replication from Rep-ID bound replication origins, including the origin at the human beta-globin (HBB) locus. At HBB, RepID is involved in an interaction between the replication origin (Rep-P) and the locus control region. RepID depleted murine embryonic fibroblasts exhibit abnormal replication fork progression and fewer replication initiation events. These observations are consistent with a model suggesting that RepID facilitates replication initiation at a distinct group of human replication origins. Nascent strands were purified with the lambda exonuclease methods from HCT116 cells and sequenced. Chromatin from unsyncrhonized untreated cultures of U2OS cells was subjected to ChIP-Seq with antibody directed against RepID/PHIP

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