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Phase Differences in Expression of Circadian Clock Genes in the Central Nucleus of the Amygdala Dentate Gyrus and Suprachiasmatic Nucleus in the Rat

机译:大鼠杏仁核齿状回和超视交叉核中昼夜节律基因表达的相位差

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摘要

We performed a high temporal resolution analysis of the transcript level of two core clock genes, Period2 (Per2) and Bmal1, and a clock output gene, Dbp, in the suprachiasmatic nucleus (SCN), the master circadian clock, and in two forebrain regions, the lateral part of the central nucleus of the amygdala (CEAl), and dentate gyrus (DG), in rats. These regions, as we have shown previously, exhibit opposite rhythms in expression of the core clock protein, PERIOD2 (PER2). We found that the expression of Per2, Bmal1 and Dbp follow a diurnal rhythm in all three regions but the phase and amplitude of the rhythms of each gene vary across regions, revealing important regional differences in temporal dynamics underlying local daily rhythm generation in the mammalian forebrain. These findings underscore the complex temporal organization of subordinate circadian oscillators in the forebrain and raise interesting questions about the functional connection of these oscillators with the master SCN clock.
机译:我们对颞上as神经核(SCN),主生物钟和两个前脑区域中的两个核心时钟基因Period2(Per2)和Bmal1,以及时钟输出基因Dbp的转录水平进行了高时间分辨率分析。 ,大鼠杏仁核中央核的外侧部分(CEA1)和齿状回(DG)。如我们先前所示,这些区域在核心时钟蛋白PERIOD2(PER2)的表达中呈现相反的节奏。我们发现,Per2,Bmal1和Dbp的表达在所有三个区域中都遵循昼夜节律,但是每个基因的节律的相位和振幅在各个区域中都不同,这揭示了在哺乳动物前脑中产生局部日节律的时间动态中重要的区域差异。这些发现强调了前脑中从属昼夜节律振荡器的复杂时间组织,并提出了有关这些振荡器与主SCN时钟的功能连接的有趣问题。

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