Atypical patterns of circadian clock gene expression in human peripheral blood mononuclear cells

Aug 13, 2005Journal of molecular medicine (Berlin, Germany)

Unusual daily patterns of internal clock gene activity in human immune cells

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Abstract

Key clock genes PER2 and BMAL1 oscillate in peripheral blood mononuclear cells from healthy humans over a 24-hour cycle.

  • Expression of PER2 and BMAL1 was consistent across all subjects, indicating a rhythmic pattern.
  • Two distinct groups of subjects displayed significantly different average timing (acrophases) of PER2 and BMAL1 expression.
  • BMAL1 and PER2 oscillated together rather than in an expected anti-phasic relationship.
  • Constant expression of REV-ERBalpha was linked to the unusual phase relationship of PER2 and BMAL1 in human PBMCs.
  • Findings suggest the presence of different chronotypes in clock gene expression patterns in humans.

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