Circadian Clock Regulates Dynamic Chromatin Modifications Associated with Arabidopsis CCA1/LHY and TOC1 Transcriptional Rhythms

Nov 7, 2012Plant & cell physiology

The biological clock controls changing DNA packaging linked to daily gene activity cycles in Arabidopsis

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Abstract

Specific histone modifications, H3K4Me3 and H3K9/14Ac, are associated with the genes CCA1, LHY, and TOC1.

  • Circadian clocks help organisms adapt to daily environmental changes.
  • CCA1, LHY, and TOC1 are essential genes involved in regulating circadian rhythms.
  • Histone modifications of these genes were examined under varying conditions.
  • Only certain histone marks were found at the start site of CCA1, LHY, and TOC1.
  • These histone modifications were more prevalent at specific times aligned with increased gene transcription.
  • Light and dark cycles influence the establishment of these chromatin changes, which are regulated by the circadian clock.

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