Activation of a translocated c-myc gene: Role of structural alterations in the upstream region Academic Article Article uri icon


MeSH Major

  • Neoplasm Proteins
  • Neoplasms
  • Neovascularization, Pathologic
  • Proteome
  • Proteomics


  • The translocated c-myc gene in AW-Ramos, a Burkitt lymphoma cell line carrying the 8;14 translocation, is expressed at 2- to 5-fold higher levels than c-myc in lymphoblastoid cell lines. The translocation event has joined c-myc to the IgM switch region. As a consequence, a recently identified immunoglobulin transcriptional enhancer element is not linked to the translocated c-myc gene. Chromosomal recombination occurs approximately equal to 340 nucleotides upstream of the c-myc 5' cap site, leaving all three c-myc exons intact. The nucleotide sequences of the two coding exons in the translocated c-myc gene are identical to those of the normal c-myc gene. Nucleotide sequence analyses of the first, noncoding c-myc exon and of the region between this exon and the chromosomal recombination point reveal two single-base differences from normal c-myc. Our data indicate that altered expression rather than an altered gene product is responsible for c-myc activation in AW-Ramos cells and that this is a result of either loss of regulatory sequences located greater than 340 nucleotides upstream of c-myc or disruption of normal c-myc regulation by one or both base substitutions. Alternatively, unidentified enhancer-like sequences in the Ig locus may alter the expression of c-myc.

publication date

  • December 1984



  • Academic Article


Digital Object Identifier (DOI)

  • 10.1073/pnas.81.21.6798

PubMed ID

  • 6593728

Additional Document Info

start page

  • 6798

end page

  • 802


  • 81


  • 21 I