Identification of a suppressor element in the amelogenin promoter

L. Xu, A. Matsumoto, A. Sasaki, H. Harada, A. Taniguchi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Amelogenin expression is regulated in a cell-type-specific manner. Investigators have previously identified an enhancer element by using the 5ĝ2 flanking sequence of the amelogenin promoter. However, the cell-type-specific regulation of the amelogenin gene remains poorly understood. In some genes, the first intron regulates tissue-specific expression. We hypothesized that intron 1 is important for the cell-type-specific regulation of amelogenin expression. We identified a suppressor element between -74 and -464. We also found enhancer activity in intron 1. Additionally, we found that the suppressor element in the promoter region suppressed intron 1 enhancer activity. The suppressor and the enhancers acted in an ameloblast-like cell line, but not in HeLa cells. Mutation of the Oct-1 binding sites reversed the suppressor activity, suggesting that Oct-1 sites are essential for suppression. These results suggest that Oct-1 and intron 1 may contribute to cell-type-specific amelogenin expression.

Original languageEnglish
Pages (from-to)246-251
Number of pages6
JournalJournal of Dental Research
Issue number3
Publication statusPublished - 2010 Mar
Externally publishedYes


  • Ameloblast.
  • Amelogenin
  • Cell-type-specific expression
  • Intron
  • Oct-1

ASJC Scopus subject areas

  • Dentistry(all)


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