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. 1994 Sep;14(9):6386–6397. doi: 10.1128/mcb.14.9.6386

A novel DNA replication origin identified in the human heat shock protein 70 gene promoter.

T Taira 1, S M Iguchi-Ariga 1, H Ariga 1
PMCID: PMC359164  PMID: 8065368

Abstract

A general and sensitive method for the mapping of initiation sites of DNA replication in vivo, developed by Vassilev and Johnson, has revealed replication origins in the region of simian virus 40 ori, in the regions upstream from the human c-myc gene and downstream from the Chinese hamster dihydrofolate reductase gene, and in the enhancer region of the mouse immunoglobulin heavy-chain gene. Here we report that the region containing the promoter of the human heat shock protein 70 (hsp70) gene was identified as a DNA replication origin in HeLa cells by this method. Several segments of the region were cloned into pUC19 and examined for autonomously replicating sequence (ARS) activity. The plasmids carrying the segments replicated episomally and semiconservatively when transfected into HeLa cells. The segments of ARS activity contained the sequences previously identified as binding sequences for a c-myc protein complex (T. Taira, Y. Negishi, F. Kihara, S. M. M. Iguchi-Ariga, and H. Ariga, Biochem. Biophys. Acta 1130:166-174, 1992). Mutations introduced within the c-myc protein complex binding sequences abolished the ARS activity. Moreover, the ARS plasmids stably replicated at episomal state for a long time in established cell lines. The results suggest that the promoter region of the human hsp70 gene plays a role in DNA replication as well as in transcription.

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Selected References

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