Fasting Imparts a Switch to Alternative Circadian Transcriptional Pathways in Liver and Muscle

The circadian gene expression in peripheral tissue displays rhythmicity which is driven by the circadian clock and feeding-fasting cycle in mammals. In this study, circadian transcriptome was performed to investigate how fasting influences circadian gene regulation. 8-week-old, male C57BL/6 mice were subjected to 24-hr fasting (FAST) or to ad libitum normal chow feeding (FED) under 12hr light/ 12hr dark schedule. Liver and gastrocnemius muscle were harvested every 4 hours over the circadian cycle at ZT0, 4, 8, 12, 16, 20 (n=3 per time point per group). Total RNA was extracted from liver and gastrocnemius muscle, and used for RNA-seq.