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Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
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Casein kinase 1 proteomics reveal prohibitin 2 function in molecular clock.

Lorna S Kategaya1, Aisha Hilliard, Louying Zhang

  • 1Department of Neurology, University of California San Francisco, San Francisco, California, United States of America.

Plos One
|March 3, 2012
PubMed
Summary

Casein kinase 1 delta and epsilon (CK1δ/CK1ε) regulate the body's internal clock. This study identifies PROHIBITIN 2 (PHB2) as a novel inhibitor of circadian transcription, revealing differential regulation by CK1δ and CK1ε.

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Published on: November 11, 2016

Area of Science:

  • Molecular Biology
  • Chronobiology

Background:

  • Circadian rhythms govern daily physiological changes, synchronized by clock proteins.
  • Casein kinase 1 delta (CK1δ) and epsilon (CK1ε) are crucial for circadian regulation via phosphorylation and potentially non-catalytic mechanisms.
  • The functional overlap between CK1δ and CK1ε remains an area of investigation.

Purpose of the Study:

  • To elucidate the mechanisms of CK1δ and CK1ε in the biological clock.
  • To identify novel regulators of circadian rhythms.
  • To investigate the functional relationship between CK1δ, CK1ε, and circadian transcription.

Main Methods:

  • Proteomic analysis of CK1δ and CK1ε in human cells.
  • Cell-based circadian assays to identify modulators.
  • Gene knockdown experiments to assess protein and transcript level changes.
  • Isolation of CK1 protein complexes.

Main Results:

  • PROHIBITIN 2 (PHB2) was identified as a novel inhibitor of circadian transcription.
  • Decreased PHB2 expression enhanced circadian-driven transcription.
  • Knockdown of CK1ε increased PHB2 protein levels, while knockdown of CK1δ decreased PHB2 transcript levels.
  • CK1δ and CK1ε were shown to differentially regulate PHB2 expression.

Conclusions:

  • PHB2 acts as an inhibitor within the molecular clock.
  • CK1δ and CK1ε play distinct roles in regulating PHB2 expression and, consequently, circadian transcription.
  • This study advances understanding of CK1 kinase function in circadian regulation.