|
KMID : 0578320120340030279
|
|
Molecules and Cells
2012 Volume.34 No. 3 p.279 ~ p.287
|
|
|
Rhythmic Oscillation of Histone Acetylation and Methylation at the Arabidopsis Central Clock Loci
|
|
Song Hae-Ryong
Noh Yoo-Sun
|
|
|
Abstract
|
|
|
|
Circadian clock genes are regulated by a transcriptional-translational feedback loop. In Arabidopsis, LATE ELON-GATED HYPOCOTYL (LHY) and CIRCADIAN CLOCK ASSO- CIATED 1 (CCA1) transcripts are highly expressed in the morning. Translated LHY and CCA1 proteins repress the expression of TIMING OF CAB EXPRESSION 1 (TOC1), which peaks in the evening. TOC1 protein induces expression of LHY and CCA1, forming a negative feedback loop which is believed to constitute the oscillatory mechanism of the clock. The rhythmic oscillation of mouse clock genes mPERIOD 1 (mPER1) and mPER2 has been correlated with regular alteration of chromatin structure through histone acetylation/deacetylation. However, little is known about the relationship between the transcriptional activity of Arabidopsis clock genes and their chromatin status. Here, we report that histone H3 acetylation (H3Ac) and H3 lysine 4 tri-methylation (H3K4me3) levels at LHY, CCA1, and TOC1 are positively correlated with the rhythmic transcript levels of these genes, whereas H3K36me2 level shows a negative correlation. Thus, our study suggests rhythmic transcription of Arabidopsis clock genes might be regulated by rhythmic histone modification, and it provides a platform for future identification of clock-control-ling histone modifiers.
|
|
|
KEYWORD
|
|
|
Arabidopsis, chromatin, circadian clock, circadian rhythm, histone modification
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
  
|
|