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. 1991 Dec 15;88(24):11383–11387. doi: 10.1073/pnas.88.24.11383

Premature termination of transcription from the P1 promoter of the mouse c-myc gene.

S Wright 1, L F Mirels 1, M C Calayag 1, J M Bishop 1
PMCID: PMC53139  PMID: 1763052

Abstract

Modulation of transcriptional elongation within the c-myc gene is thought to play a major role in determining levels of c-myc mRNA in both normal and tumor cells. A discrete site of blockage to transcriptional elongation has previously been localized at the 3' end of exon 1 of the mouse and human c-myc genes. We here identify an additional site of transcriptional attenuation that is located between the P1 and P2 promoters of the c-myc gene and that mediates premature termination of transcripts initiating from the P1 promoter. A 95-nucleotide DNA fragment derived from this region prematurely terminated transcription when placed downstream from the promoter of the H-2Kbm1 gene and assayed by expression in Xenopus oocytes. We also show that the previously identified attenuation signal in exon 1 of the mouse c-myc gene can mediate premature termination of P1-initiated transcripts. Premature termination of P1-initiated transcripts presumably increases transcription from the downstream P2 promoter; aberrant regulation of this termination may explain the increased use of the P1 promoter that is characteristic of certain tumors in which myc is overexpressed.

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