Histone Acetyltransferase-dependent Chromatin Remodeling and the Vascular Clock

Anne M. Curtis, Sang Beom Seo, Elizabeth J. Westgate, Radu Daniel Rudic, Emer M. Smyth, Debabrata Chakravarti, Garret A. FitzGerald*, Peter McNamara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

178 Scopus citations


Rhythmic gene expression is central to the circadian control of physiology in mammals. Transcriptional activation of Per and Cry genes by heterodimeric bHLH-PAS proteins is a key event in the feedback loop that drives rhythmicity; however, the mechanism is not clearly understood. Here we show the transcriptional coactivators and histone acetyltransferases, p300/CBP, PCAF, and ACTR associate with the bHLH-PAS proteins, CLOCK and NPAS2, to regulate positively clock gene expression. Furthermore, Cry2 mediated repression of NPAS2:BMAL1 is overcome by overexpression of p300 in transactivation assays. Accordingly, p300 exhibits a circadian time-dependent association with NPAS2 in the vasculature, which precedes peak expression of target genes. In addition, a rhythm in core histone H3 acetylation on the mPer1 promoter in vivo correlates with the cyclical expression of their mRNAs. Temporal coactivator recruitment and HAT-dependent chromatin remodeling on the promoter of clock controlled genes in the vasculature permits the mammalian clock to orchestrate circadian gene expression.

Original languageEnglish (US)
Pages (from-to)7091-7097
Number of pages7
JournalJournal of Biological Chemistry
Issue number8
StatePublished - Feb 20 2004

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry
  • Cell Biology


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