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. 1986 May;5(5):899–904. doi: 10.1002/j.1460-2075.1986.tb04301.x

A negative transcriptional control element located upstream of the murine c-myc gene.

E F Remmers, J Q Yang, K B Marcu
PMCID: PMC1166880  PMID: 3013622

Abstract

We have investigated the nature of regulatory sequences within the vicinity of the murine c-myc locus by analyzing the expression of myc-chloramphenicol acetyl transferase (CAT) vectors transfected into a human lymphoblastoid cell line (BJAB) and a monkey fibroblast line (COS). CAT enzymatic assays and S1 nuclease protection experiments reveal that a negative element resides 428-1188 bp 5' of the first c-myc promoter, P1. This 760-bp segment of 5'-flanking c-myc DNA dramatically inhibits CAT gene expression in the pSV2CAT vector when placed in either orientation approximately 1.7 kb 3' (and approximately 3.2 kb 5' on the circular plasmid) from the SV40 promoter region. By employing this strategy, we were unable to identify an analogous DNA segment that is closer to or within the first c-myc exon. We propose that this 5' c-myc region be termed a 'dehancer' since this negative element has the opposite properties of a transcriptional enhancer.

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Selected References

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