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. 1983 Dec;80(24):7476–7480. doi: 10.1073/pnas.80.24.7476

Activation of the c-myc gene by translocation: a model for translational control.

H Saito, A C Hayday, K Wiman, W S Hayward, S Tonegawa
PMCID: PMC389974  PMID: 6324175

Abstract

We have shown that the human cellular oncogene c-myc is composed of three exons and is transcribed from two initiation sites separated by 175-base-pair DNA in HeLa cells. For both resulting mRNA species, exon 1 composes the 5' untranslated region and the initiator methionine is located 16 base pairs down-stream from the 5' splice acceptor of exon 2. In a non-Hodgkin lymphoma, Manca, harboring a t(8; 14) translocation, c-myc gene is broken within intron 1, and its exons 2 and 3 are translocated to a site between the heavy chain joining region cluster and C mu-coding DNA segment of the immunoglobulin heavy chain locus. The translocated c-myc gene is transcribed from points within intron 1 but is apparently still translated from the same methionine codon as the mRNA from the unrearranged c-myc gene. The nucleotide sequence of the c-myc gene shows that a region of exon 1 is highly complementary to a region of exon 2. Thus the mRNA from the untranslocated c-myc gene, as opposed to that of the translocated c-myc gene, could form a stable stem-loop structure (delta Go = -90 kcal/mol; 1 cal = 4.184 J) where the initiator AUG would be located within the loop. In view of the bind-and-scan model for the initiation of eukaryotic translation, we propose that such a secondary structure will severely hinder the translation. We further propose that the c-myc gene is often activated by translocation through the escape from such a translational suppression.

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Selected References

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