Histone acetyltransferase-dependent chromatin remodeling and the vascular clock.
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.
Mesh Terms:
Acetyltransferases, Amino Acid Motifs, Animals, Basic Helix-Loop-Helix Transcription Factors, CLOCK Proteins, Chromatin, Circadian Rhythm, Dimerization, E1A-Associated p300 Protein, Gene Expression Regulation, Hela Cells, Histone Acetyltransferases, Histones, Humans, Mice, Mice, Inbred C57BL, Microscopy, Fluorescence, Myocardium, NIH 3T3 Cells, Nerve Tissue Proteins, Nuclear Proteins, Precipitin Tests, Promoter Regions, Genetic, Protein Binding, Protein Structure, Tertiary, RNA, Reverse Transcriptase Polymerase Chain Reaction, Time Factors, Trans-Activators, Transcription Factors, Transcription, Genetic, Transcriptional Activation, Transfection
Acetyltransferases, Amino Acid Motifs, Animals, Basic Helix-Loop-Helix Transcription Factors, CLOCK Proteins, Chromatin, Circadian Rhythm, Dimerization, E1A-Associated p300 Protein, Gene Expression Regulation, Hela Cells, Histone Acetyltransferases, Histones, Humans, Mice, Mice, Inbred C57BL, Microscopy, Fluorescence, Myocardium, NIH 3T3 Cells, Nerve Tissue Proteins, Nuclear Proteins, Precipitin Tests, Promoter Regions, Genetic, Protein Binding, Protein Structure, Tertiary, RNA, Reverse Transcriptase Polymerase Chain Reaction, Time Factors, Trans-Activators, Transcription Factors, Transcription, Genetic, Transcriptional Activation, Transfection
J. Biol. Chem.
Date: Feb. 20, 2004
PubMed ID: 14645221
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