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EMBO J. 1986 Nov; 5(11): 2859–2865.
doi: 10.1002/j.1460-2075.1986.tb04580.x
PMCID: PMC1167235
PMID: 3024965

Intragenic pausing and anti-sense transcription within the murine c-myc locus.

A Nepveu and K B Marcu
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Abstract

We present a detailed analysis of strand-specific transcription in different regions of the murine c-myc locus. In normal and transformed cell lines, RNA polymerase II directed transcription occurs in the sense and anti-sense direction. Three noncontiguous regions show a high level of transcription in the anti-sense orientation: upstream of the first exon, within the first intron and in the 3' part of the gene (intron 2 and exon 3). In a cell line carrying a c-myc amplification (54c12), anti-sense transcription is not uniformly increased throughout the locus and is differentially affected by inhibition of protein synthesis. These results suggest that anti-sense transcription in various parts of the locus is independently regulated. In the sense orientation, transcriptional activity is higher in the first exon than in the rest of the gene indicating that transcription pauses near the 3' end of the first exon. The extent of this intragenic pausing varies among different cell lines and is most severe in cells with a c-myc amplification. Transcription initiation and pausing are both negatively regulated by labile proteins.

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Selected References

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