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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Genetics

Background:

  • The circadian clock regulates daily physiological and behavioral rhythms via gene expression.
  • Mammalian circadian clocks utilize the D-box DNA cis-element for transcriptional regulation.
  • Albumin D-site-Binding Protein (DBP) activates transcription, while E4BP4 represses it at the D-box.

Purpose of the Study:

  • To elucidate the physiological roles of D-box elements in the mammalian circadian clockwork.
  • To identify genomic regions bound by DBP and E4BP4 in mouse liver.
  • To investigate the function of E4BP4 in circadian gene expression and clock resetting.

Main Methods:

  • Bioinformatic analysis using MOCCS2 to define functional D-box sequences.
  • Identification of 1490 genomic regions bound by DBP and E4BP4 in mouse liver.
  • RNA-Seq analysis of wild type and E4bp4-knockout mouse livers.

Main Results:

  • Comprehensive definition of functional D-box sequences.
  • Demonstration of E4BP4's importance in circadian gene expression rhythms via RNA-Seq.
  • Discovery that environmental stimuli acutely induce E4BP4, causing phase shifts and clock resetting.

Conclusions:

  • D-box-mediated transcriptional regulation is essential for both input and output pathways of the circadian clock system.
  • E4BP4 plays a critical role in circadian repression and environmental entrainment of the clock.
  • The study highlights the intricate regulatory network governing circadian rhythms at the D-box level.