title: SWItch/sucrose nonfermentable (SWI/SNF) complex subunit BAF60a integrates hepatic circadian clock and energy metabolism.
abstract: Many aspects of energy metabolism, including glucose and lipid homeostasis and mitochondrial oxidative metabolism, are under precise control by the mammalian circadian clock. However, the molecular mechanism for coordinate integration of the circadian clock and various metabolic pathways is poorly understood. Here we show that BAF60a, a chromatin-remodeling complex subunit, is rhythmically expressed in the liver of mice. Mice with liver-specific knockdown of BAF60a show abnormalities in the rhythmic expression pattern of clock and metabolic genes and in the circulating metabolite profile. Consistently, knockdown of BAF60a impairs the oscillation of clock genes in serum-shocked HepG(2) cells. At the molecular level, BAF60a activates Bmal1 and G6Pase transcription by way of the coactivation of retinoid-related orphan receptor alpha (RORα). In addition, BAF60a is present near ROR response elements (RORE) on the proximal Bmal1 and G6Pase promoters and turns the chromatin structure into the active state.
  
  
  CONCLUSIONS
  Our data suggest a critical role for BAF60a in the coordinated regulation of hepatic circadian clock and energy metabolism in mammals.
authors: Jiangsu Key Laboratory for Molecular and Medical Biotechnology and College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu, China.
authors: Weiwei
authors: W
authors: Tao
authors: Siyu
authors: S
authors: Chen
authors: Guangsen
authors: G
authors: Shi
authors: Jinhu
authors: J
authors: Guo
authors: Ying
authors: Y
authors: Xu
authors: Chang
authors: C
authors: Liu
mesh_terms: D000818:Animals; D047369:Chromatin Immunoprecipitation; D057906:Circadian Clocks / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004734:Energy Metabolism / Q000235:genetics*; D005786:Gene Expression Regulation; D005952:Glucose-6-Phosphatase / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D012333:RNA, Messenger / Q000378:metabolism; D011897:Random Allocation; D060888:Real-Time Polymerase Chain Reaction; D012016:Reference Values; D013395:Sucrose / Q000378:metabolism; D046509:Tissue Culture Techniques; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; C489892:IGHMBP2 protein, human; D012333:RNA, Messenger; D015534:Trans-Activators; D014157:Transcription Factors; D013395:Sucrose; D005952:Glucose-6-Phosphatase; C519262:glucose-6-phosphatase-beta, mouse