首页> 外文期刊>The Journal of Nutritional Biochemistry >Clock genes regulate the feeding schedule-dependent diurnal rhythm changes in hexose transporter gene expressions through the binding of BMAL1 to the promoter/enhancer and transcribed regions
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Clock genes regulate the feeding schedule-dependent diurnal rhythm changes in hexose transporter gene expressions through the binding of BMAL1 to the promoter/enhancer and transcribed regions

机译:时钟基因通过BMAL1与启动子/增强子和转录区的结合来调节进食时间表依赖性己糖转运蛋白基因表达的昼夜节律变化

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摘要

The expression of hexose transporter genes (SGLT1, GLUT5 and GLUT2) in mice with ad libitum feeding under light (7:00-19:00)-dark (19:00-7:00) cycle gradually increased from a basal level at 7:00 and reached a maximum at 19:00, coinciding with the start of dark phase feeding. The peaks of these gene expressions were shifted to 7:00 in mice that were subjected to a restricted feeding schedule from 9:00 to 17:00. The expression of BMAL1, a transcription factor driving the central feedback loop of the clock genes, was followed by the increase of hexose transporter gene expressions. The expressions of Per1-3, genes related to negative regulation of BMAL1, were the highest at or just after the time of maximal expression of the hexose transporter genes in both the group fed ad libitum and the restricted feeding group. Furthermore, chromatin immunoprecipitation assays revealed that the binding of BMAL1 to the promoter and/or transcribed regions of hexose transporters and Per 2 genes was associated with changes in their expressions. These results suggest that diurnal changes in expression of hexose transporter genes depend on the feeding schedule and are directly regulated by a feedback loop of clock genes
机译:轻度(7:00-19:00)-黑暗(19:00-7:00)周期随意喂养的小鼠中己糖转运蛋白基因(SGLT1,GLUT5和GLUT2)的表达从基础水平(7)开始逐渐增加:00并在19:00达到最大值,这与暗阶段进料的开始相吻合。在从9:00到17:00进行受限喂养计划的小鼠中,这些基因表达的峰值移动到7:00。 BMAL1是驱动时钟基因的中央反馈环的转录因子,其表达随后是己糖转运蛋白基因表达的增加。任意喂食组和限制喂食组中,与BMAL1负调控相关的基因Per1-3的表达在己糖转运蛋白基因最大表达时或刚表达时最高。此外,染色质免疫沉淀试验表明BMAL1与己糖转运蛋白和Per 2基因的启动子和/或转录区的结合与它们表达的变化有关。这些结果表明,己糖转运蛋白基因表达的日变化取决于进食时间表,并由时钟基因的反馈环直接调控。

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