MassIVE MSV000092804

Partial Public PXD044982

More than the clock: distinct regulation of muscle function and metabolism by PER2 and RORalpha

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Description

Circadian rhythms, governed by the dominant central as well as various peripheral clocks, regulate almost all biological processes, including sleep-wake cycles, hormone secretion, and metabolism. In certain contexts, regulation and function of the peripheral oscillations can be decoupled from the central clock. However, the specific mechanisms underlying muscle-intrinsic clock-dependent modulation of muscle function and metabolism remain unclear. We investigated the outcome of perturbations of the primary and secondary feedback loops of the molecular clock in skeletal muscle by specific gene ablation of Period (Per2) and RAR-related orphan receptor alpha (RORalpha), respectively. In both models, a dampening of core clock gene oscillation was observed, while the phase was preserved. Moreover, both loops seem involved in the homeostasis of amine groups. Very divergent outcomes were seen for overall muscle gene expression, primarily affecting circadian rhythmicity in the Per2, and non-oscillating genes in the RORalpha knockouts, leading to distinct outcomes in terms of metabolome and phenotype. These results highlight the entanglement of the molecular clock and muscle plasticity, and allude to specific functions of different clock components, i.e. the primary and secondary feedback loops, in this context. The reciprocal interaction between muscle contractility and circadian clocks might therefore be instrumental to determine a finely tuned adaptation of muscle tissue to perturbations in health and disease. [doi:10.25345/C5K35MQ6G] [dataset license: CC0 1.0 Universal (CC0 1.0)]

Keywords: circadian rhythm ; molecular clock ; skeletal muscle ; exercise ; Per2 ; RORalpha ; transcriptional regulation

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Principal Investigators:
(in alphabetical order) 		Alexander Schmidt, Biozentrum, Universtiy of Basel, 4056 Basel, Switzerland, N/A
Submitting User: verizy27
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