Methylation at CpG islands in intron 1 of EGR2 confers enhancer-like activity

Motoko Unoki, Yusuke Nakamura

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52 Citations (Scopus)

Abstract

We previously demonstrated several lines of evidence indicating that early growth response 2 (EGR2) functions as a tumor suppressor, partly on the basis that its expression was often decreased in human tumors and cancer cell lines. Here we report a possible molecular mechanism to account for down-regulation of EGR2 in tumor cells. Although no genetic mutations in the gene or alterations in methylation status of its promoter were detected, we found a high degree of methylation at CpG islands in intron 1 of EGR2 in cell lines that were expressing this gene at a high level. Moreover, reporter gene experiments revealed that methylated intron 1 had somehow conferred enhancer-like activity. The data imply the existence of a previously unsuspected mechanism of gene expression regulation.

Original languageEnglish
Pages (from-to)67-72
Number of pages6
JournalFEBS Letters
Volume554
Issue number1-2
DOIs
Publication statusPublished - Nov 6 2003
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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