Abstract
Biological oscillations often cycle at different harmonics of the 24-h circadian rhythms, a phenomenon we coined “Musica Universalis” in 2017. Like the circadian rhythm, the 12-h oscillation is also evolutionarily conserved, robust, and has recently gained new traction in the field of chronobiology. Originally thought to be regulated by the circadian clock and/or environmental cues, recent new evidences support the notion that the majority of 12-h rhythms are regulated by a distinct and cell-autonomous pacemaker that includes the unfolded protein response (UPR) transcription factor spliced form of XBP1 (XBP1s). 12-h cycle of XBP1s level in turn transcriptionally generates robust 12-h rhythms of gene expression enriched in the central dogma information flow (CEDIF) pathway. Given the regulatory and functional separation of the 12-h and circadian clocks, in this review, we will focus our attention on the mammalian 12-h pacemaker, and discuss our current understanding of its prevalence, evolutionary origin, regulation, and functional roles in both physiological and pathological processes.
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Acknowledgement
We want to thank Dr. Akhilesh Reddy for kindly sharing with us the raw RNA-seq data to analyze ultradian rhythm in BMAL1-less ex vivo liver slices. We also would like to thank Dr. Baby Anjum for assistance with initial literature search. We apologize for any potential omission of relevant works and citations due to space constraints. We thank the American Diabetes Association junior faculty development award 1-18-JDF-025 to B.Z. B.Z. was further supported by the National Institute Of General Medical Sciences of the National Institutes of Health under Award Number DP2GM140924. Research reported in this publication was further supported by the National Institute of Diabetes And Digestive And Kidney Diseases of the National Institutes of Health under award number P30DK120531 to Pittsburgh Liver Research Center, in which B.Z. is a member. H.B. is further supported by a T32 training grant T32AG021885 from National Institute of Health. The content is solely the responsibility of the authors and does not necessarily represent the official views of the funding agencies.
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18_2020_3730_MOESM1_ESM.tif
Figure S1. The XBP1s-dependent 12-hour pacemaker is separate from the BMAL1-dependent circadian clock in mouse. Representative gene expression of 12-hour and/or circadian genes in wild-type, XBP1 liver specific knockout [6], and BMAL1-knockout ex vivo liver slices [30]. Temporal cistrome of XBP1s as well as key core circadian clock TFs are further shown. (tif 11670 kb)
18_2020_3730_MOESM2_ESM.xlsx
Table S1. Rhythms uncovered for ETS TFs in mouse liver. For everyone EST TF, whether a 12-hour or circadian rhythm exist is shown, as well as the dominant rhythm identified (xlsx 12 kb)
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Ballance, H., Zhu, B. Revealing the hidden reality of the mammalian 12-h ultradian rhythms. Cell. Mol. Life Sci. 78, 3127–3140 (2021). https://doi.org/10.1007/s00018-020-03730-5
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DOI: https://doi.org/10.1007/s00018-020-03730-5