Abstract
Understanding the physiology of human-induced pluripotent stem cells (iPSCs) is necessary for directed differentiation, mimicking embryonic development, and regenerative medicine applications. Pluripotent stem cells (PSCs) exhibit unique abilities such as self-renewal and pluripotency, but they lack some functions that are associated with normal somatic cells. One such function is the circadian oscillation of clock genes; however, whether or not PSCs demonstrate this capability remains unclear. In this study, the reason why circadian rhythm does not oscillate in human iPSCs was examined. This phenomenon may be due to the transcriptional repression of clock genes resulting from the hypermethylation of histone H3 at lysine 27 (H3K27), or it may be due to the low levels of brain and muscle ARNT-like 1 (BMAL1) protein. Therefore, BMAL1-overexpressing cells were generated and pre-treated with GSK126, an inhibitor of enhancer of zest homologue 2 (EZH2), which is a methyltransferase of H3K27 and a component of polycomb repressive complex 2. Consequently, a significant circadian rhythm following endogenous BMAL1, period 2 (PER2), and other clock gene expression was induced by these two factors, suggesting a candidate mechanism for the lack of rhythmicity of clock gene expression in iPSCs.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This research was funded by Japan Society for the Promotion of Science, grant number KAKENHI 18K06876, and Adaptable and Seamless Technology transfer Program through Target-driven R&D (A-STEP) from Japan Science and Technology Agency Grant Number JPMJTM19GL. The authors would like to thank Enago (www.enago.jp) for the English language review.
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This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number JP18K06876 and by Adaptable and Seamless Technology transfer Program through Target-driven R&D (A-STEP) from Japan Science and Technology Agency Grant Number JPMJTM19GL.
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HK performed experiments. HK, TK, and KT designed experiments and analyzed data. HK and TK wrote the paper. TK and KT oversaw the project.
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Kaneko, H., Kaitsuka, T. & Tomizawa, K. Artificial induction of circadian rhythm by combining exogenous BMAL1 expression and polycomb repressive complex 2 inhibition in human induced pluripotent stem cells. Cell. Mol. Life Sci. 80, 200 (2023). https://doi.org/10.1007/s00018-023-04847-z
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DOI: https://doi.org/10.1007/s00018-023-04847-z