Transcriptional programming of lipid and amino acid metabolism by the skeletal muscle circadian clock
File(s)journal.pbio.2005886 (1).pdf (21.49 MB)
Published version
Author(s)
Type
Journal Article
Abstract
Circadian clocks are fundamental physiological regulators of energy homeostasis, but direct transcriptional targets of the muscle clock machinery are unknown. To understand how the muscle clock directs rhythmic metabolism, we determined genome-wide binding of the master clock regulators brain and muscle ARNT-like protein 1 (BMAL1) and REV-ERBα in murine muscles. Integrating occupancy with 24-hr gene expression and metabolomics after muscle-specific loss of BMAL1 and REV-ERBα, here we unravel novel molecular mechanisms connecting muscle clock function to daily cycles of lipid and protein metabolism. Validating BMAL1 and REV-ERBα targets using luciferase assays and in vivo rescue, we demonstrate how a major role of the muscle clock is to promote diurnal cycles of neutral lipid storage while coordinately inhibiting lipid and protein catabolism prior to awakening. This occurs by BMAL1-dependent activation of Dgat2 and REV-ERBα-dependent repression of major targets involved in lipid metabolism and protein turnover (MuRF-1, Atrogin-1). Accordingly, muscle-specific loss of BMAL1 is associated with metabolic inefficiency, impaired muscle triglyceride biosynthesis, and accumulation of bioactive lipids and amino acids. Taken together, our data provide a comprehensive overview of how genomic binding of BMAL1 and REV-ERBα is related to temporal changes in gene expression and metabolite fluctuations.
Date Issued
2018-08-10
Date Acceptance
2018-07-27
Citation
PLoS Biology, 2018, 16 (8)
ISSN
1544-9173
Publisher
Public Library of Science (PLoS)
Journal / Book Title
PLoS Biology
Volume
16
Issue
8
Copyright Statement
© 2018 Dyar et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited (https://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/30096135
PII: pbio.2005886
Subjects
06 Biological Sciences
11 Medical And Health Sciences
07 Agricultural And Veterinary Sciences
Developmental Biology
Publication Status
Published
Coverage Spatial
United States
Article Number
ARTN e2005886
Date Publish Online
2018-08-10