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. 1993 Jan 1;90(1):282–286. doi: 10.1073/pnas.90.1.282

Characterization of cis-acting elements regulating transcription of the human DF3 breast carcinoma-associated antigen (MUC1) gene.

M Abe 1, D Kufe 1
PMCID: PMC45644  PMID: 8419933

Abstract

The present studies have examined the sequences responsible for regulating transcription of the human DF3 breast carcinoma-associated antigen (MUC1) gene. A region 1656 base pairs upstream to the DF3 transcription initiation site was fused to the chloramphenicol acetyltransferase gene. Transient expression assays using a series of deleted constructs demonstrated that the region from position -618 contains the regulatory sequences necessary for DF3 transcription in human MCF-7 breast cancer cells. Further analysis with internal deletion vectors and heterologous promoter constructs indicated the involvement of cis-acting elements in the fragment extending from positions -598 to -485. By gel retardation and DNA footprinting, we have identified a protein in MCF-7 cells that recognizes sequences between positions -505 and -485. The results of Southwestern studies demonstrate that this protein has an apparent molecular mass of 45 kDa. Taken together, these results suggest that DF3 gene transcription is regulated by a previously undescribed transacting factor.

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Selected References

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