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Science. 2015 Nov 6;350(6261):aac4250. doi: 10.1126/science.aac4250.

Pancreatic β cell enhancers regulate rhythmic transcription of genes controlling insulin secretion.

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  • 1Department of Medicine, Division of Endocrinology, Metabolism and Molecular Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.
  • 2Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, USA.
  • 3Medical Scientist Training Program, University of Chicago, Chicago, IL 60637, USA. Graduate Program in the Biophysical Sciences, University of Chicago, Chicago, IL 60637, USA. James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
  • 4McArdle Laboratory for Cancer Research, University of Wisconsin, Madison, WI 52705, USA.
  • 5Graduate Program in the Biophysical Sciences, University of Chicago, Chicago, IL 60637, USA. James Franck Institute, University of Chicago, Chicago, IL 60637, USA. Department of Chemistry, University of Chicago, Chicago, IL 60637, USA.
  • 6Department of Medicine, Division of Endocrinology, Metabolism and Molecular Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA. j-bass@northwestern.edu.

Abstract

The mammalian transcription factors CLOCK and BMAL1 are essential components of the molecular clock that coordinate behavior and metabolism with the solar cycle. Genetic or environmental perturbation of circadian cycles contributes to metabolic disorders including type 2 diabetes. To study the impact of the cell-autonomous clock on pancreatic β cell function, we examined pancreatic islets from mice with either intact or disrupted BMAL1 expression both throughout life and limited to adulthood. We found pronounced oscillation of insulin secretion that was synchronized with the expression of genes encoding secretory machinery and signaling factors that regulate insulin release. CLOCK/BMAL1 colocalized with the pancreatic transcription factor PDX1 within active enhancers distinct from those controlling rhythmic metabolic gene networks in liver. We also found that β cell clock ablation in adult mice caused severe glucose intolerance. Thus, cell type-specific enhancers underlie the circadian control of peripheral metabolism throughout life and may help to explain its dysregulation in diabetes.

Copyright © 2015, American Association for the Advancement of Science.

PMID:
26542580
[PubMed - indexed for MEDLINE]
PMCID:
PMC4669216
Free PMC Article

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