Abstract:
:We report the genome-wide mapping of ORC1 binding sites in mammals, by chromatin immunoprecipitation and parallel sequencing (ChIP-seq). ORC1 binding sites in HeLa cells were validated as active DNA replication origins (ORIs) using Repli-seq, a method that allows identification of ORI-containing regions by parallel sequencing of temporally ordered replicating DNA. ORC1 sites were universally associated with transcription start sites (TSSs) of coding or noncoding RNAs (ncRNAs). Transcription levels at the ORC1 sites directly correlated with replication timing, suggesting the existence of two classes of ORIs: those associated with moderate/high transcription levels (≥1 RNA copy/cell), firing in early S and mapping to the TSSs of coding RNAs; and those associated with low transcription levels (<1 RNA copy/cell), firing throughout the entire S and mapping to TSSs of ncRNAs. These findings are compatible with a scenario whereby TSS expression levels influence the efficiency of ORC1 recruitment at G(1) and the probability of firing during S.
journal_name
Genome Resjournal_title
Genome researchauthors
Dellino GI,Cittaro D,Piccioni R,Luzi L,Banfi S,Segalla S,Cesaroni M,Mendoza-Maldonado R,Giacca M,Pelicci PGdoi
10.1101/gr.142331.112subject
Has Abstractpub_date
2013-01-01 00:00:00pages
1-11issue
1eissn
1088-9051issn
1549-5469pii
gr.142331.112journal_volume
23pub_type
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