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. 1996 Feb 20;93(4):1498–1503. doi: 10.1073/pnas.93.4.1498

In vivo protein-DNA interactions at human DNA replication origin.

D S Dimitrova 1, M Giacca 1, F Demarchi 1, G Biamonti 1, S Riva 1, A Falaschi 1
PMCID: PMC39968  PMID: 8643660

Abstract

Protein-DNA interactions were studied in vivo at the region containing a human DNA replication origin, located at the 3' end of the lamin B2 gene and partially overlapping the promoter of another gene, located downstream. DNase I treatment of nuclei isolated from both exponentially growing and nonproliferating HL-60 cells showed that this region has an altered, highly accessible, chromatin structure. High-resolution analysis of protein-DNA interactions in a 600-bp area encompassing the origin was carried out by the in vivo footprinting technique based on the ligation-mediated polymerase chain reaction. In growing HL-60 cells, footprints at sequences homologous to binding sites for known transcription factors (members of the basic-helix-loop-helix family, nuclear respiratory factor 1, transcription factor Sp1, and upstream binding factor) were detected in the region corresponding to the promoter of the downstream gene. Upon conversion of cells to a nonproliferative state, a reduction in the intensity of these footprints was observed that paralleled the diminished transcriptional activity of the genomic area. In addition to these protections, in close correspondence to the replication initiation site, a prominent footprint was detected that extended over 70 nucleotides on one strand only. This footprint was absent from nonproliferating HL-60 cells, indicating that this specific protein-DNA interaction might be involved in the process of origin activation.

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