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12-h clock regulation of genetic information flow by XBP1s.
PLOS Biology ( IF 7.8 ) Pub Date : 2020-01-14 , DOI: 10.1371/journal.pbio.3000580
Yinghong Pan 1 , Heather Ballance 2 , Huan Meng 3 , Naomi Gonzalez 3 , Sam-Moon Kim 4 , Leymaan Abdurehman 2 , Brian York 3 , Xi Chen 3 , Yisrael Schnytzer 5 , Oren Levy 5 , Clifford C Dacso 3 , Colleen A McClung 4 , Bert W O'Malley 3 , Silvia Liu 6, 7 , Bokai Zhu 2, 7, 8
Affiliation  

Our group recently characterized a cell-autonomous mammalian 12-h clock independent from the circadian clock, but its function and mechanism of regulation remain poorly understood. Here, we show that in mouse liver, transcriptional regulation significantly contributes to the establishment of 12-h rhythms of mRNA expression in a manner dependent on Spliced Form of X-box Binding Protein 1 (XBP1s). Mechanistically, the motif stringency of XBP1s promoter binding sites dictates XBP1s's ability to drive 12-h rhythms of nascent mRNA transcription at dawn and dusk, which are enriched for basal transcription regulation, mRNA processing and export, ribosome biogenesis, translation initiation, and protein processing/sorting in the Endoplasmic Reticulum (ER)-Golgi in a temporal order consistent with the progressive molecular processing sequence described by the central dogma information flow (CEDIF). We further identified GA-binding proteins (GABPs) as putative novel transcriptional regulators driving 12-h rhythms of gene expression with more diverse phases. These 12-h rhythms of gene expression are cell autonomous and evolutionarily conserved in marine animals possessing a circatidal clock. Our results demonstrate an evolutionarily conserved, intricate network of transcriptional control of the mammalian 12-h clock that mediates diverse biological pathways. We speculate that the 12-h clock is coopted to accommodate elevated gene expression and processing in mammals at the two rush hours, with the particular genes processed at each rush hour regulated by the circadian and/or tissue-specific pathways.

中文翻译:

XBP1s对基因信息流的12小时时钟调节。

我们的小组最近对一个独立于昼夜节律的具有细胞自主性的哺乳动物12小时钟进行了表征,但对其功能和调节机制的了解仍很少。在这里,我们表明,在小鼠肝脏中,转录调控以依赖于X-box结合蛋白1(XBP1s)的剪接形式的方式显着有助于建立12小时节拍的mRNA表达。从机制上讲,XBP1s启动子结合位点的基序严格性决定了XBP1s在黎明和黄昏时驱动新生mRNA转录的12小时节律的能力,丰富了基础转录调节,mRNA加工和输出,核糖体生物发生,翻译起始,内质网(ER)-高尔基体中的蛋白质加工/分选,其时间顺序与中央教条信息流(CEDIF)描述的进行性分子加工顺序一致。我们进一步确定了GA结合蛋白(GABPs)作为推定的新型转录调节因子,可驱动具有更多不同阶段的基因表达的12小时节律。这些具有基因表达的12小时节律是细胞自主的,并且在具有昼夜节律时钟的海洋动物中进化保守。我们的结果证明了哺乳动物12小时时钟转录控制的进化上保守的复杂网络,该网络介导了多种生物途径。我们推测,在两个高峰时段,人们选择采用12小时制来适应哺乳动物中高表达的基因表达和加工,
更新日期:2020-02-03
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