Transcriptional corepressor TLE1 functions with Runx2 in epigenetic repression of ribosomal RNA genes

Syed A. Ali, Sayyed K. Zaidi, Jason R. Dobson, Abdul R. Shakoori, Jane B. Lian, Janet L. Stein, Andre J. Van Wijnen, Gary S. Stein

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Epigenetic control of ribosomal RNA (rRNA) gene transcription by cell type-specific regulators, such as the osteogenic transcription factor Runx2, conveys cellular memory of growth and differentiation to progeny cells during mitosis. Here, we examined whether coregulatory proteins contribute to epigenetic functions that are mitotically transmitted by Runx2 in osteoblastic cells. We show that the transcriptional corepressor Transducin Like Enhancer-1 (TLE1) associates with rRNA genes during mitosis and interphase through interaction with Runx2. Mechanistically, depletion of TLE1 relieves Runx2-mediated repression of rRNA genes transcription and selectively increases histone modifications linked to active transcription. Biologically, loss of TLE-dependent rRNA gene repression coincides with increased global protein synthesis and enhanced cell proliferation. Our findings reinforce the epigenetic marking target genes by phenotypic transcription factors in mitosis and demonstrate a requirement for retention of coregulatory factors to sustain physiological control of gene expression during proliferation of lineage committed cells.

Original languageEnglish (US)
Pages (from-to)4165-4169
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume107
Issue number9
DOIs
StatePublished - Mar 2 2010

Keywords

  • Cell cycle
  • Cell fate
  • Coregulatory factors
  • Interphase nucleoli
  • Mitotic NORs

ASJC Scopus subject areas

  • General

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    Ali, S. A., Zaidi, S. K., Dobson, J. R., Shakoori, A. R., Lian, J. B., Stein, J. L., Van Wijnen, A. J., & Stein, G. S. (2010). Transcriptional corepressor TLE1 functions with Runx2 in epigenetic repression of ribosomal RNA genes. Proceedings of the National Academy of Sciences of the United States of America, 107(9), 4165-4169. https://doi.org/10.1073/pnas.1000620107